Grupo TMM, S.A.B. (GTMAY) 20-F17 May 212020 FY Annual report (foreign)Financial data

Company Profile

Document and Entity Information

Document and Entity Information	12 Months Ended
Document and Entity Information	Dec. 31, 2020shares
Cover [Abstract]
Entity Registrant Name	GRUPO TMM SAB
Entity Central Index Key	0001163560
Document Type	20-F
Amendment Flag	false
Document Annual Report	true
Current Fiscal Year End Date	--12-31
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Document Transition Report	false
Document Shell Company Report	false
Entity Address, Country	MX
Entity Common Stock, Shares Outstanding	102,182,841
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Document Accounting Standard	International Financial Reporting Standards
Entity Shell Company	false

Consolidated statements of fina

Consolidated statements of financial position - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current
Cash and cash equivalents (Note 6)	$ 105,310	$ 476,714
Restricted cash (Note 6)	37,672	36,085
Trade receivables, net (Note 7)	186,363	344,030
Other accounts receivable (Note 8)	264,261	421,770
Related parties (Note 15)	42,228	163,344
Materials and supplies	53,853	60,964
Prepayments	32,465	22,696
Total current assets	722,152	1,525,603
Non-current
Other accounts receivable (Note 8)	238,000	0
Property, vessels and equipment, net (Note 9)	2,531,996	2,285,420
Right-of-use assets (Note 10)	354,232	560,099
Intangible assets (Note 12)	151,250	141,484
Concession rights, net (Note 11)	1,892	5,676
Other non-current assets	31,025	45,493
Total non-current assets	3,308,395	3,038,172
Total assets	4,030,547	4,563,775
Short-term
Short-term portion of the financial debt (Note 14)	129,085	139,189
Short-term leases liabilities (Note 10)	58,245	60,578
Trade payables	228,959	262,159
Accounts payable and accrued expenses (Note 16)	525,108	499,529
Related parties (Note 15)	1,458	87,573
Total short-term liabilities	942,855	1,049,028
Long-term
Long-term portion of the financial debt (Note 14)	53,644	118,737
Long-term lease liabilities (Note 10)	297,268	526,781
Accounts payable	23,551	46,742
Employee benefits (Note 23)	150,197	151,481
Deferred income tax (Note 21)	315,624	248,214
Total long-term liabilities	840,284	1,091,955
Total liabilities	1,783,139	2,140,983
Stockholders' equity (Note 17):
Share capital (103,760,541 shares authorized and issued)	2,216,733	2,216,733
Treasury shares (1,577,700 shares)	(46,805)	(46,805)
Accumulated losses	(963,602)	(565,526)
Other components of equity	999,675	771,958
Controlling interest	2,206,001	2,376,360
Non-controlling interest	41,407	46,432
Total stockholders' equity	2,247,408	2,422,792
Total liabilities and stockholders' equity	$ 4,030,547	$ 4,563,775

Consolidated statements of fi_2

Consolidated statements of financial position (Parenthetical) - shares	Dec. 31, 2020	Dec. 31, 2019
Stockholders' equity
Common stock, shares authorized (in shares)	103,760,541	103,760,541
Common stock, shares issued (in shares)	103,760,541	103,760,541
Treasury shares (in shares)	1,577,700	1,577,700

Consolidated statements of prof

Consolidated statements of profit or loss - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Consolidated statements of profit or loss [Abstract]
Revenue from transportation (Note 18)	$ 1,203,281	$ 1,475,683	$ 1,523,066
Costs and expenses:
Salaries, wages and employee benefits (Note 23)	341,399	343,700	368,614
Leases (Note 10)	312,463	300,466	436,469
Contracted services	293,543	448,217	413,060
Fuel, materials and supplies	170,753	206,820	211,793
Depreciation, amortization and loss from revaluation	141,051	182,880	80,277
Other costs and expenses	15,635	14,740	17,221
Total costs and expenses	1,274,844	1,496,823	1,527,434
Transportation loss	(71,563)	(21,140)	(4,368)
Other (expenses) income, net (Note 19)	(257,225)	233,907	102,625
Operating (loss) profit	(328,788)	212,767	98,257
Comprehensive financing cost:
Interest income	7,097	5,100	9,137
Interest expense and other financial costs (Note 20)	(75,654)	(146,875)	(84,890)
Exchange (loss) gain, net	(25,145)	24,875	5,844
Total comprehensive financing cost	(93,702)	(116,900)	(69,909)
(Loss) profit before taxes	(422,490)	95,867	28,348
Income tax expense (benefit) (Note 21)	19,334	(64,575)	(4,799)
Net (loss) profit for the year	(403,156)	31,292	23,549
Attributable to:
Non-controlling interest	(5,025)	(772)	4,543
Controlling interest	$ (398,131)	$ 32,064	$ 19,006
Profit per share for the year (Note 24)
(Loss) profit per share for the year (in dollars per share)	$ (3.896)	$ 0.314	$ 0.186
Weighted average number of shares for the year (in shares)	102,182,841	102,182,841	102,182,841

Consolidated statements of comp

Consolidated statements of comprehensive income - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Consolidated statements of comprehensive income [Abstract]
Net (loss) profit for the year	$ (403,156)	$ 31,292	$ 23,549
Items that will not be subsequently reclassified to profit or loss
Actuarial gains, net (Note 23)	10,953	2,354	15,430
Revaluation surplus (Note 25)	314,436	379,420	(161,411)
Income tax on other comprehensive income	(97,617)	(114,532)	43,794
Total of other comprehensive income (loss) for the year	227,772	267,242	(102,187)
Comprehensive (loss) income for the year	(175,384)	298,534	(78,638)
Attributable to:
Non-controlling interest	(5,025)	(772)	4,543
Controlling interest	$ (170,359)	$ 299,306	$ (83,181)

Consolidated statements of chan

Consolidated statements of changes in stockholders' equity - MXN ($) $ in Thousands	Total	Share Capital [Member]	Treasury Shares [Member]	Mandatory Convertible Debentures Into Shares [Member]	Accumulated Losses [Member]	Other Components of Equity [Member]	Subtotal [Member]	Non Controlling Interest [Member]	Number of Outstanding Common Shares [Member]
Balance, beginning of period at Dec. 31, 2017	$ 2,229,062	$ 2,216,733	$ (46,805)	$ 0	$ (859,159)	$ 849,466	$ 2,160,235	$ 68,827
Balance, beginning of period (in shares) at Dec. 31, 2017									102,182,841
Net (loss) profit for the year	23,549	0	0	0	19,006	0	19,006	4,543
Other comprehensive income	(102,187)	0	0	0	40,335	(142,522)	(102,187)	0
Comprehensive income for the year	(78,638)						(83,181)	4,543
Dividends paid to non-controlling interest	(26,166)						0	(26,166)
Balance, end of period at Dec. 31, 2018	2,124,258	2,216,733	(46,805)	0	(799,818)	706,944	2,077,054	47,204
Balance, end of period (in shares) at Dec. 31, 2018									102,182,841
Net (loss) profit for the year	31,292	0	0	0	32,064	0	32,064	(772)
Other comprehensive income	267,242	0	0	0	202,228	65,014	267,242	0
Comprehensive income for the year	298,534						299,306	(772)
Balance, end of period at Dec. 31, 2019	$ 2,422,792	2,216,733	(46,805)	0	(565,526)	771,958	2,376,360	46,432
Balance, end of period (in shares) at Dec. 31, 2019	102,182,841								102,182,841
Net (loss) profit for the year	$ (403,156)	0	0	0	(398,131)	0	(398,131)	(5,025)
Other comprehensive income	227,772	0	0	0	55	227,717	227,772	0
Comprehensive income for the year	(175,384)						(170,359)	(5,025)
Balance, end of period at Dec. 31, 2020	$ 2,247,408	$ 2,216,733	$ (46,805)	$ 0	$ (963,602)	$ 999,675	$ 2,206,001	$ 41,407
Balance, end of period (in shares) at Dec. 31, 2020	102,182,841								102,182,841

Consolidated statements of cash

Consolidated statements of cash flow - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
(Loss) profit before taxes	$ (422,490)	$ 95,867	$ 28,348
Adjustments to reconcile the profit with cash used in operating activities:
Depreciation, amortization and loss from revaluation	141,051	182,880	80,277
Other amortizations	20,140	1,679	5,259
(Gain) loss from the sale of property, vessels and equipment, net	(153)	(23,415)	1,849
Accrued interests	72,093	140,021	80,580
Interest income	(7,097)	(5,100)	(9,137)
Exchange (loss) gain, net	43,873	(26,411)	(8,312)
Gain from the sale of subsidiaries	(451)	(279,744)	(111,484)
Changes in assets and liabilities:
Accounts receivable	(80,333)	(95,847)	2,454
Other accounts receivable and related parties	162,437	45,287	(98,394)
Materials and supplies	7,111	(4,343)	1,440
Prepayments	(9,769)	2,177	(13,346)
Other accounts payable and accrued expenses	(145,729)	(46,638)	117,065
Other non-current assets	4,702	4,981	(22,685)
Employee benefits	2,002	(25,125)	1,046
Total adjustments	209,877	(129,598)	26,612
Cash (used in) from operating activities	(212,613)	(33,731)	54,960
Cash from investment activities
Proceeds from sale of property, vessels and equipment	614	16,233	169,627
Acquisition of property, vessels and equipment	(28,375)	(48,281)	(86,283)
Sale of subsidiaries, net	33,985	600,887	50,331
Dividends paid to non-controlling interest	0	0	(26,166)
Interest charged	7,097	5,100	9,137
Cash from investment activities	13,321	573,939	116,646
Cash flow from financing activities
Proceeds from debt	31,419	29,590	124,010
Repayment of debt	(123,703)	(189,026)	(397,458)
Repayment of leases	(90,432)	(134,245)	0
Interest paid	(22,712)	(42,510)	(40,792)
Cash used in financing activities	(205,428)	(336,191)	(314,240)
Exchange effect on cash	33,316	(6,145)	(607)
(Decrease) increase in cash and cash equivalents	(371,404)	197,872	(143,241)
Cash and cash equivalents, beginning of year	476,714	278,842	422,083
Cash and cash equivalents, end of year	105,310	476,714	278,842
Supplementary information:
Income tax	$ 10,873	$ 14,512	$ 4,799

Nature of operations

Nature of operations	12 Months Ended
Nature of operations	Dec. 31, 2020
Nature of operations [Abstract]
Nature of operations	1 Nature of operations Principal activity Grupo TMM, S.A.B. (‘Grupo TMM’ or the ‘Company’) is a Mexican company whose principal activity is providing multimodal transport and logistics services to premium customers throughout Mexico. The Company’s activities are grouped into the following service divisions: • Maritime: • Ports and terminals: • Logistics: • Warehousing: On March 11, 2020, the WHO declared COVID-19 to be a pandemic. In response, governments throughout the world, including Mexico, have implemented various extraordinary measures to control its spread, including travel restrictions, quarantines, and the suspension of non-essential activities. The effect of the COVID-19 pandemic on the Company’s business continues to be uncertain, and it will depend on its duration and its impact on the Mexican and global economies. However, as of the date of these financial statements, various international banks and multilateral institutions such as the International Monetary Fund have assessed that the COVID-19 pandemic resulted in the worst global economic recession since the Great Depression. For fiscal 2020, the Company’s revenues, particularly in the Ports and Terminals segment, have decreased due to the COVID-19 pandemic, and the various emergency public health measures implemented by governments to combat it. Although the Company expects its revenues to improve as these extraordinary measures are lifted and public health emergency restrictions are removed, as of the date of these consolidated financial statements, the Company cannot quantify the adverse effect that COVID-19 will have on its operating profit for fiscal 2021. In view of the foregoing and other conditions beyond the control of the Company, operating profit can be volatile and subject to change rapidly as the situation of COVID-19 develops. Consequently, the Company has taken various measures to maintain business continuity and strengthen its financial position, including the deferment of payments to suppliers and creditors, maintenance of its early collection program to help offset the effect of delays in payments from customers, as well as different actions to reduce general expenses. As part of these efforts, the Company decided to relocate its corporate headquarters, which will generate significant savings in corporate costs. The Company continues to comply with the health and safety protocols established by the Mexican government, and it has taken measures and implemented policies to safeguard the threats posed by the COVID-19 pandemic, its businesses, employees, and the locations in which it operates. These steps include, among other things, active cleaning and disinfection of open public areas, the implementation of a sophisticated videoconference platform and collaborative remote work, as well as the reinforcing of information security protocols, which have allowed employees to be able to continue to participate in the full scope of Company activities from any location, so as to guarantee operating continuity without placing the health of employees at risk. In addition, the Company has continued to provide health benefits to employees on a temporary leave of absence until the end of the pandemic. In the future, the Company will continue to monitor the development of the COVID-19 pandemic closely, including its effect on the Company’s businesses, financial condition, and operating profit. To limit the spread of COVID-19, the Mexican government has imposed various safety measures, including the suspension of all non-essential activities. In view of these conditions, the Company has taken various actions to protect its facilities and employees, strengthen the business, and promote its financial recovery. The Company maintains limited access to its facilities, has implemented additional cleaning and disinfection measures, allows employees to work remotely where possible and has implemented new controls for emergency procedures and to mitigate potential cybersecurity risks. Although these actions have helped to maintain business continuity, they can limit the efficiency of Company operations, including reports and internal controls. At this time, the severity of the global economic recession expected to arise from the COVID-19 pandemic is uncertain; therefore, Management continues to monitor the material impact of the pandemic on operating income and the financial position of the Company. As part of Company’s effort to mitigate the effects of the pandemic, it has done the following: • continued with its strategic plan to offset part of the instability in the oil industry and the recent COVID-19 pandemic by: (a) reducing costs and general and administrative expenses; (ii) maintaining its early collection program (the “supply chain program”) through Nacional Financiera, SNC, therby reducing liquidity risk and the effect of delays in the payments that can result from recent changes in the payment policies of PEMEX; and (iii) diversifying its customer base; and (iv) negotiating payment deferments and extensions of the maturity date of certain financial commitments; Grupo TMM, S.A.B. and Subsidiaries 11 • adopted various measures to help guarantee that financial and audit reporting processes continue to be sound, and as timely as possible in the middle of the global crisis of the COVID-19 pandemic, including, among other things, implementing: (i) new controls for emergency procedures; (ii) close monitoring of IT access controls to enable remote work to be performed; (iii) controls for mitigating the possible increase in cyber risks arising from a higher level of remote work; (iv) alternative controls appropriately designed to offset the lack of information that may arise where it is not possible to conduct face-to-face controls; and (v) an alternative audit plan to test the operating effectiveness of controls remotely, due to travel restrictions; and • expanded its customer base in each of its businesses, thereby strengthening the position of the Company on the market and successfully achieving better operating margins. The business strategy of the Company, which will help to mitigate the effects of the COVID-19 pandemic, is focused mainly on the following: Expansion and improvement of maritime operations The Energy Reform has the potential to increase exploration activities and hydrocarbon production in Mexico, both with PEMEX and with other participants of the industry (domestic and international). To maximize opportunities created by this reform and considering the protection of the Mexican Navigation Law (Mexican flag vessels to carry out cabotage transportation in Mexican waters), the maritime business is focused on consolidating and expanding its operations by: i) increasing cabotage services with medium and long-term contacts; ii) satisfying the growing demand for distribution and exploration services in Mexico and abroad, by meeting the requirements of the new generation of vessels with greater deep water capacities; iii) increasing the current capacity of repair services in the shipyard to more than 30 ships per year, and it is expected to have shipbuilding capacity in the long-term, which will enable the Company to compete to satisfy the demand for current and future ship customers. Expansion of port and terminal operations Tuxpan is the closest port to Mexico City and the states of central Mexico, which represent more than 50% of the GDP of Mexico, and it is the major port for importing gasoline and diesel, which represent more than 70% of domestic consumption. In view of the opportunities offered by the Energy Reform for increased imports of gasoline and diesel and the strategic location of the Company’s land in Tuxpan, in August 2016 the Company announced a strategic association with TransCanada and Sierra Oil & Gas to develop new infrastructure for storage, transportation, and distribution of refined petroleum products from Tuxpan, Veracruz to the center of the country. In February 2019, the Company agreed to acquire from Sierra Oil & Gas its 50% stake in the Optimus company, for the amount of $2.6 million dollars, resulting in Optimus becoming a 100% subsidiary company of the Company and giving the Company full responsibility for the development of the project. To take advantage of the growth potential of this market, the Company continues with efforts to develop this and other port facilities and storage terminals to satisfy the future demand of imports of gasoline and diesel. In addition, the Company retains a significant part of the land in Tuxpan where it intends to develop projects related to that region, such as a general cargo terminal. Expansion of logistics operations The Company takes advantage of experience and knowledge of Mexico and its laws, customer relationships, and its skills in human resource management and unions to expand the business with the automotive industry and, in general all activities related to shipyards and storage management, with an emphasis on “just-in-time” inventory management, storage, sub-assemblies, and yard management. Improving warehousing operations The Company continues to work to improve bonded warehouse service, as well as the import tariff service. In addition, it continues to focus on growth through rendering a comprehensive logistics service to its customers, which range from bonded warehouse services, inventory management, added value services, and delivery to the end customer. Structure of Grupo TMM At December 31, 2020 and 2019, Grupo TMM holds the percentage of equity interest in various subsidiaries, the most significant are as follows: % of ownership 2020 2019 Specialized maritime Transportación Marítima Mexicana, S.A. de C.V. 100 % 100 % Inmobiliaria Dos Naciones, S. de R.L. de C.V. 100 % 100 % TMM Parcel Tankers, S.A. de C.V. 100 % 100 % Logistics Almacenadora de Depósito Moderno, S.A. de C.V. (Warehouse) 100 % 100 % Autotransportación y Distribución Logística, S.A. de C.V. 100 % 100 % TMM Almacenadora, S.A.P.I. de C.V. 100 % 100 % Ports and terminals TMM Logistics, S.A. de C.V. 100 % 100 % Prestadora de Servicios MTR, S.A. de C.V. 100 % 100 % Bimonte, S.A. de C.V. 100 % 100 % Administradora Marítima TMM, S.A.P.I. de C.V. 100 % 100 % Caoba Energía, S. de R.L. de C.V. 100 % 100 % Services & Solutions Optimus, S. de R.L de C.V. 100 % 100 % Servicios Administrativos API Acapulco, S.A. de C.V. 51 % 51 % Administración Portuaria Integral de Acapulco, S.A. de C.V. 51 % 51 % Payroll outsourcing Mexschiff Operación de Personal, S.A.P.I. de C.V. 100 % 100 % Omexmar Operadora Mexicana Marítima, S.A.P.I. de C.V. 100 % 100 % Perhafen Services Marítimos, S.A.P.I. de C.V. 100 % 100 % TMM Dirección Corporativa, S.A.P.I. de C.V. 100 % 100 % Perjomar Operadora, S.A.P.I. de C.V. 100 % 100 % Property leasing Inmobiliaria TMM, S.A. de C.V. 100 % 100 % The Company’s subsidiaries are incorporated in Mexico, where most of their activities take place. Non-controlling interest in subsidiaries Grupo TMM holds an equity interest in the subsidiaries Administración Portuaria Integral de Acapulco, S.A. de C.V. and Servicios Administrativos API Acapulco, S.A. de C.V., for which there is non-controlling interest; the associated effect on the Company’s consolidated financial statements is considered immaterial. These companies are established and conduct their activities in Mexico. Investments in associates The Company maintains investments in the following associates: (a) In July 2014, Grupo TMM contributed $40,000 to the capital stock of Almacenes de Jugos Citricos de Mexico, S.A.P.I. de C.V., which represents 21% of the voting shares. Since this entity has not started up operations as of the issue date of the consolidated financial statements, Company Management decided to reserve the investment in its entirety. (b) The Company lost control of its subsidiary TMM División Marítima, S.A. de C.V. (TMM DM) in 2017, retaining 15% equity in its capital without exerting significant influence. Accordingly, this investment has been classified as an investment in associate. As of December 31, 2020 and 2019, the value of this investment is nil, since the stockholders’ equity of TMM DM is negative. Moreover, in accordance with the statutes of TMM DM, the stockholders only assume obligation in connection with their equity up to the amount thereof.

General information and stateme

General information and statement of compliance with IFRS	12 Months Ended
General information and statement of compliance with IFRS	Dec. 31, 2020
General information and statement of compliance with IFRS [Abstract]
General information and statement of compliance with IFRS	2 General information and statement of compliance with IFRS Grupo TMM’s head office is located at Paseo de la Reforma N° 296 piso 19, Colonia Juárez, Alcaldía Cuauhtémoc, C.P. 06600, Mexico City. In addition, a significant portion of its maritime division activities is conducted at Calle 55 N° 2 Col. Electricistas C.P. 24120 Cd. del Carmen, Campeche. Grupo TMM’s shares are listed on the Mexican Stock Exchange, where they trade under the symbol TMM A. In the United States, Grupo TMM’s shares trade on the “Over-the-Counter’ (‘OTC’) market in the form of American Depositary Shares (‘ADSs’) under the symbol GTMAY. Grupo TMM and its subsidiaries prepare their consolidated financial statements in accordance with International Financial Reporting Standards (‘IFRS’), as issued by the International Accounting Standards Board (‘IASB’), and these are presented in thousands of Mexican pesos. They have been prepared under the assumption that Grupo TMM operates on a going concern basis. The Company has decided to present in its consolidated statements of income a subtotal of ‘Operating income’ which reconciles with the ‘Net profit for the year’ considering the items of ‘Comprehensive financing cost’ and ‘Income tax expense’; with regard to the subtotal of ‘Transportation loss’, the latter reconciles with the ‘Operating income’ considering the item ‘Other (expenses) income’.

Changes in accounting policies

Changes in accounting policies	12 Months Ended
Changes in accounting policies	Dec. 31, 2020
Changes in accounting policies [Abstract]
Changes in accounting policies	3 Changes in accounting policies New Standards adopted as of January 1, 2020 Some accounting pronouncements which have become effective from 1 January 2020 and have therefore been adopted do not have a significant impact on the Company’s financial results or position. Other Standards and amendments that are effective for the first time in 2020 and could be applicable to the Company are: • Definition of a Business (Amendments to IFRS 3) • Definition of Material (Amendments to IAS 1 and IAS 8) • Interest Rate Benchmark Reform (Amendments to IFRS 9, IAS 39 and IFRS 7) • Amendments to Refences to the Conceptual Framework (Various Standards) • COVID-19 Rent Related Concessions (Amendments to IFRS 16) These amendments do not have a significant impact on these financial statements and therefore the disclosures have not been made. Standards, amendments and Interpretations to existing Standards that are not yet effective and have not been adopted early by the Company At the date of authorization of these consolidated financial statements, several new, but not yet effective Standards, amendments to existing Standards, and Interpretations have been published by the IASB, none of which have been adopted in advance by Grupo TMM. Other new standards and amendments that are not yet effective and have not been adopted early by the Company include: • References to the Conceptual Framework • Annual Improvements to IFRS Standards 2018-2020 Cycle (Amendments to IFRS 1, IFRS 9, IFRS 16, IAS 41) • Classification of Liabilities as Current or Non-current (Amendments to IAS 1) These amendments are not expected to have a significant impact on the financial statements in the period of initial application and therefore the disclosures have not been made. Management anticipates that all relevant pronouncements will be adopted for the first period beginning on or after the effective date of the pronouncement. New Standards, amendments and Interpretations not adopted in the current year have been disclosed as they are not expected to have a material impact on the Company’s consolidated financial statements.

Summary of significant accounti

Summary of significant accounting policies	12 Months Ended
Summary of significant accounting policies	Dec. 31, 2020
Summary of significant accounting policies [Abstract]
Summary of significant accounting policies	4 Summary of significant accounting policies The most significant accounting policies are summarized as follows: 4.1 Basis of preparation The Company’s financial statements have been prepared on an accrual basis and under the historical cost convention except for the revaluation of vessels and properties. Monetary amounts are expressed in Mexican pesos and are rounded to the nearest thousands, except for earnings per share. 4.2 Basis of consolidation The consolidated financial statements include the accounts of Grupo TMM and those of its subsidiaries. Grupo TMM controls a subsidiary when it is exposed, or has rights, to variable returns resulting from its involvement with the subsidiary and has the ability to affect those returns through its power over the subsidiary. All subsidiaries have the reporting date of “December 31”, for all years reported. The balances and transactions among subsidiaries have been eliminated for the purposes of consolidation, including balances and unrealized gains on transactions between Grupo TMM’s companies. Unrealized losses on the sale of assets among the Company are eliminated in the consolidation and the asset involved is also reviewed for impairment from a group perspective. Accounting policies of subsidiaries have been adjusted where necessary to ensure consistency with the policies adopted by Grupo TMM. Profit or loss and other comprehensive income of subsidiaries acquired or disposed during the year are recognized from the effective date of acquisition, or up to the effective date of disposal, as applicable. Non-controlling interest, presented as part of the stockholders’ equity, represents the portion of the subsidiary’s profit or loss and net assets that are not held by Grupo TMM. The Company attributes the total comprehensive income or loss of the subsidiaries between the owners of the parent and the non-controlling interest based on their respective ownership interests. Associates and joint ventures Associates are all entities over which Grupo TMM has significant influence but not control. A joint venture is a joint arrangement whereby the parties that have joint control of the arrangement having rights to the net assets of the arrangement. Investments in associates and joint ventures are accounted by the equity method and are initially recognized at their acquisition cost. The carrying amount of investments in associates and joint ventures is increased or decreased to recognize Grupo TMM’s share of the profit or loss and other comprehensive income of the associate and joint venture, adjusted where necessary to ensure consistency with the accounting policies of the Company. Unrealized gains on transactions between Grupo TMM and its associates and joint ventures are eliminated to the extent of the Company’s interest on those entities. When unrealized losses are eliminated, the asset involved is also tested for impairment. 4.3 Business combinations Grupo TMM applies the acquisition method to accounting for business combinations. The consideration transferred by Grupo TMM to obtain control of a subsidiary is calculated as the sum of the fair values on the acquisition-date of the assets transferred, liabilities incurred, and the equity interests issued by Grupo TMM, which includes, accordingly, the fair value of any asset or liability that arises from the contingent consideration arrangement. Acquisition costs are expensed as incurred. Grupo TMM recognizes identifiable assets acquired and liabilities assumed in the business combination independent of whether these were recognized in acquirer’s financial statements prior to the acquisition. Assets acquired and liabilities assumed are generally measured at their acquisition-date fair value. Goodwill is stated after the individual recognition of identifiable intangible assets. It is calculated as the excess of the sum of : a) the fair value of the consideration transferred, b) the amount recognized for any non-controlling interest in the entity acquired, and c) the fair value on the acquisition date of any equity interest in the acquire, over the acquisition-date the fair values of the identifiable net assets. If the fair values of the identifiable net assets exceed the sum calculated above, this excess amount (e.g. gain on a bargain purchase) is immediately recognized in profit or loss. 4.4 Foreign currency translation Functional and presentation currency The consolidated financial statements are reported in Mexican pesos, which is also the functional currency of Grupo TMM. Foreign currency balances and transactions Foreign currency transactions are translated into the functional currency of the respective Company entity, using the exchange rates prevailing at the dates of the transactions (spot exchange rate). Foreign exchange gains and losses resulting from the settlement of such transactions and from the measurement of monetary items denominated in foreign currency at year-end exchange rates are recognized in profit or loss. Non-monetary items are not retranslated at year-end and are measured at historical cost (translated using the exchange rates at the transaction date), except for non-monetary items measured at fair value which are translated using the exchange rates at the date when fair value was determined. 4.5 Cash and cash equivalents Cash and cash equivalents comprise cash on hand and demand deposits, together with other highly liquid and short-term investments that are readily convertible into known amounts of cash and which are subject to insignificant risk of change in their value. 4.6 Materials and supplies Materials and supplies, consisting mainly of fuel and items for the maintenance of property, vessels and equipment, are valued at the lower of the average cost and the net realizable value. 4.7 Prepayments Represent prepayments for services that will be received in the future and are amortized in the period when said services are received. 4.8 Property, vessels and equipment Properties and vessels The properties (land and buildings) are measured at fair value, which are determined by external professional valuers every three years or before if the market factors indicate a significant change in the fair value. The last valuation of these assets was in December 2019. The vessels are measured at fair value and as of December 31, 2020 and 2019, the revalued amounts were determined using the revenue technique (expected future cash flows). The frequency of the revaluations for this class of assets will be based on the changes of the fair values, meaning when these values significantly differ from their carrying value. The Company has revaluated this class of assets as of December 31, 2020 and 2019. The revaluation surplus that is derived from the valuation of properties and vessels is recognized as part of ‘Other comprehensive income items’ and forms part of ‘other capital components’ in stockholders’ investment. A revaluation surplus is credited to income up to an amount equivalent to any revaluation write-down or impairment loss previously recognized income. Any excess is recognized in ‘Other comprehensive income items’ and in stockholders’ equity in the item of ‘Revaluation surplus’. Revaluation write-downs or impairment losses are recognized in ‘Other comprehensive income items’ up to the amount previously recognized on that asset in stockholders’ equity in the item of ‘Revaluation surplus’. Any remaining decrease is recognized in income for the year. Any remaining balance of the revaluation surplus in stockholders’ equity at the time of disposing of the asset that gave rise thereto is reclassified to retained earnings. Moreover, any remaining balance of the revaluation surplus in stockholders’ equity may not be distributed to stockholders. The depreciation of properties and vessels is recognized using the straight-line method to write down its carrying value less its estimated residual value. As no finite useful life for land can be determined, the related carrying amounts are not depreciated. Equipment Equipment is stated at construction or acquisition cost, including any cost directly attributable to bringing the assets to the location and condition necessary for them to be capable of operating in the manner intended by Grupo TMM’s Management. Acquisitions through capital leases or charter arrangements with an obligation to purchase are capitalized based on the present value of future minimum payments, recognizing the related liability. Depreciation of equipment is computed using the straight-line method based on the useful lives of the assets net of the estimated residual value. Recurring maintenance and repair expenditures are charged to operating expenses as incurred. Major repairs to vessels (docks) are capitalized and amortized over the period in which benefits are expected to be received (two to five years for vessels). The material residual values and the estimated useful life are adjusted as necessary, at least once a year. Gains or losses from the disposal of property, vessels and equipment are determined as differences between the disposal proceeds and the carrying amount of the assets and are recognized in profit or loss as part of ‘Other (expenses) income’, accordingly (see Note 19). Construction in progress Disbursements attributable to construction of assets that are identifiable and may be controlled by the Company are recognized as assets when they meet the following conditions: • it is technically possible to complete the construction of the asset so that it can be available to be used; • management has the intent of completing the asset to use it; • it can be proven that the asset will generate economic benefits in the future; • adequate technical, financial or another type of resources are available to complete the asset; and • the disbursement attributable to the asset during its construction can be determined reliably. 4.9 Leased assets The Company as lessee The Company makes the use of leasing arrangements principally of warehouse, courtyards, corporate building and cranes. The rental contracts for facilities are typically negotiated for terms of between 1 and 9 years and some of these have extension terms. Lease terms for cranes have lease terms of between 1 and 2 years without any extension terms. The Company does not enter into sale and leaseback arrangements. All the leases are negotiated on an individual basis and contain a wide variety of different terms and conditions. The Company assesses whether a contract is or contains a lease at inception of the contract. A lease conveys the right to direct the use and obtain substantially all of the economic benefits of an identified asset for a period of time in exchange for consideration. Some lease contracts contain both lease and non-lease components. These non-lease components are usually associated with facilities management services. The Company has elected to separate their lease and non-lease components based on their relative stand-alone prices. Measurement and recognition of leases as a lessee At lease commencement date, the Company recognizes a right-of-use asset and a lease liability in its consolidated statement of financial position. The right-of-use asset is measured at cost, which is made up of the initial measurement of the lease liability. The Company depreciates the right-of-use asset on a straight-line basis from the lease commencement date to the earlier of the end of the useful life of the right-of-use asset or the end of the lease term. The Company also assesses the right-of-use asset for impairment when such indicators exist. At the commencement date, the Company measures the lease liability at the present value of the lease payments unpaid at that date, discounted using the Company’s incremental borrowing rate on the date of the revaluation when the implicit lease rate cannot be easily determined. Lease payments included in the measurement of the lease liability are made up of fixed payments and variable payments based on an index or rate. Subsequent to initial measurement, the liability will be reduced by lease payments that are allocated between repayments of principal and finance costs. The finance cost is the amount that produces a constant periodic rate of interest on the remaining balance of the lease liability. The lease liability is reassessed when there is a change in the lease payments. Changes in lease payments arising from a change in the lease term. The revised lease payments are discounted using the Company’s incremental borrowing rate at the date of reassessment when the rate implicit in the lease cannot be readily determined. The amount of the remeasurement of the lease liability is reflected as an adjustment to the carrying amount of the right-of-use asset. Payments under leases can also change when change through an index or a rate used to determine those payments. The lease liability is remeasured only when the adjustment to lease payments takes effect and the revised contractual payments for the remainder of the lease term are discounted using an unchanged discount rate. The remeasurement of the lease liability is dealt with by a reduction in the carrying amount of the right-of-use asset to reflect the full or partial termination of the lease for lease modifications that reduce the scope of the lease. Any gain or loss relating to the partial or full termination of the lease is recognized in profit or loss. The right-of-use asset is adjusted for all other lease modifications. The Company has elected to account for short-term leases and leases of low-value assets using the practical expedients. Instead of recognizing a right-of-use asset and lease liability, the payments in relation to these are recognized as an expense in profit or loss on a straight-line basis over the lease term. The Company as lessor As a lessor the Company classifies its leases as either operating or finance leases. A lease is classified as a finance lease if it transfers substantially all the risks and rewards incidental to ownership of the underlying asset and classified as an operating lease if it does not. 4.10 Intangible assets Recognition of intangible assets Concession rights Concession rights correspond to payments made for the rights to operate assets under concession, which are stated at cost and are amortized over the terms specified in the corresponding agreements. Software Software licenses acquired are capitalized on the basis of costs incurred to acquire and install the specific software. Trademark The trademark acquired in a business combination that qualifies for separate recognition is considered an intangible asset and is recorded at its fair value. Subsequent measuring All finite-lived intangible assets are accounted for using the cost model by which the net capitalized costs of their residual value are amortized using the straight-line method throughout their estimated useful lives, in the case of the concession rights; these are amortized according to the term specified in the corresponding agreement. The residual values and useful lives are reviewed at each reporting date. The trademark is considered an intangible asset with an indefinite life; therefore, it is subject to impairment tests annually as described in Note 13. The amortization is included in the consolidated statement of operations as part of the depreciation, amortization, and loss on revaluation item. Subsequent expenditures to preserve software and trademarks are expensed as incurred. 4.11 Impairment testing of long-lived assets For impairment assessment purposes, assets are grouped at the lowest levels for which there are largely independent cash inflows (cash-generating units). As a result, some assets are tested individually for impairment and some are tested at cash-generating unit level. Trademark is allocated to those cash-generating units that are expected to benefit from synergies of a related business combination and represent the lowest level within the Company at which management monitors the trademark. Cash-generating units to which trademark has been allocated (determined by the Grupo TMM’s Management as equivalent to its operating segments) are tested for impairment at least annually. All other individual assets or cash-generating units are tested for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. An impairment loss is recognized for the amount by which the asset’s (or cash-generating unit’s) carrying amount exceeds its recoverable amount, which is the higher of fair value less costs of disposal and value-in-use. To determine the value-in-use, management estimates expected future cash flows from each cash-generating unit and determines a suitable discount rate in order to calculate the present value of those cash flows. The data used for impairment testing procedures are directly linked to the Grupo TMM’s latest approved budget, adjusted as necessary to exclude the effects of future reorganizations and asset enhancements. Discount factors are determined individually for each cash-generating unit and reflect current market assessments of the time value of money and asset-specific risk factors. Impairment losses for cash-generating units reduce first the carrying amount of any goodwill allocated to that cash-generating unit. Any remaining impairment loss is charged pro rata to the other assets in the cash-generating unit. 4.12 Financial instruments Recognition and derecognition Financial assets and financial liabilities are recognized when the Company becomes a party to the contractual provisions of the financial instrument. Financial assets are derecognized when the contractual rights to the cash flow from a financial asset expire, or when the financial asset and all the substantial risks and benefits have been transferred. A financial liability is derecognized as extinguished, discharged, canceled, or expired. Classification and initial measurement of financial assets Except for those trade receivables that do not contain a significant financing component and are measured at the transaction price in accordance with IFRS 15, all financial assets are initially measured at fair value, adjusted by transaction costs (where applicable). Financial assets are classified into the following categories: • amortized cost • fair value through profit or loss (FVTPL) • fair value through other comprehensive income (FVOCI). In the periods presented the Company does not have any financial assets categorized as FVTPL or FVOCI. The classification is determined by both: • the Company’s business model for managing the financial asset; and • the contractual cash flow characteristics of the financial asset. All income and expenses relating to financial assets that are recognized in profit or loss are presented within financial costs and income; except for impairment of trade receivables which is presented in the heading of ‘Other costs and expenses’. Subsequent measurement of financial assets Financial assets at amortized cost Financial assets are measured at amortized cost if the assets meet the following conditions: • they are held within a business model whose objective is to hold the financial assets and collect its contractual cash flows; and • the contractual terms of the financial assets give rise to cash flows that are solely payments of principal and interest on the principal amount outstanding. After initial recognition, these are measured at amortized cost using the effective interest method. The financial assets of the Company are not discounted since it is not material. The Company’s cash and cash equivalents, trade receivables and part of the other accounts receivable fall into this category of financial instruments. Impairment of financial assets IFRS 9’s impairment requirements use more forward-looking information to recognize expected credit losses – the ‘expected credit loss (ECL) model’. Instruments within the scope of the new requirements included mainly trade receivables, contract assets recognized and measured under IFRS 15, other accounts receivables and accounts receivable from related parties. Recognition of credit losses considers a broader range of information when assessing credit risk and measuring expected credit losses, including past events, current conditions, reasonable and supportable forecasts that affect the expected collectability of the future cash flows of the instrument. Grupo TMM makes use of a simplified approach in accounting for trade and other accounts receivables as well as contract assets and records the loss allowance as lifetime expected credit losses. These are the expected shortfalls in contractual cash flows, considering the potential for default at any point during the life of the financial instrument. In calculating, the Company uses its historical experience, external indicators and forward-looking information to calculate the expected credit losses using a provision matrix. The Company assess impairment of trade receivables based on the characteristics of the business segment, when appropriate this assessment is made on a collective basis as they possess shared credit risk characteristics, they have been grouped based on the days past due. Refer to Note 26, for a detailed analysis of how the impairment requirements of IFRS 9 are applied. Classification and measurement of financial liabilities The Company’s financial liabilities include borrowings, trade and other payables. Financial liabilities are initially measured at fair value, and, where applicable, adjusted for transaction costs. Subsequently, financial liabilities are measured at amortized cost using the effective interest method. All interest-related charges are included within finance costs or finance income. 4.13 Provisions, contingent liabilities and contingent assets Provisions are recognized when the present obligations resulting from a past event will probably lead to an outflow of the Company economic resources and the amounts can be reliably estimated. Timing or amount of the outflow may still be uncertain. A present obligation arises from a presence of a legal or constructive commitment that has resulted from past events. Provisions are not recognized for future operating losses. Provisions are the estimated amounts required to be expended to settle the present obligation based on the most reliable evidence available at the date of the consolidated financial statements, including the risks and uncertainties associated with the present obligation. Provisions are discounted at their present value, where the time value of money is material. All provisions are reviewed on the issuance of the financial statements and adjusted to reflect the current best estimate. When an outflow of economic resources for present obligations is not probable, this is not recognized as a liability, unless it was assumed in the course of a business combination. Such cases are disclosed as contingent liabilities unless the outflow of resources is remote. Possible inflows of the Company’s economic benefits, which do not yet meet the criteria for recognition of an asset, are considered as contingent assets. 4.14 Taxes on earnings Calculation of current income tax is based on tax rates and tax laws that have been enacted or substantially enacted to the reporting date of the consolidated financial statements. Deferred income tax is determined using the liability method, based on temporary differences arising between the tax basis of assets and liabilities and their carrying amounts in the financial statements. Determination of deferred income tax has considered tax rates that will be effective at the time of reversion of the temporary differences. The income tax expense in the statement of profit or loss includes the sum of the deferred tax, which has not been recognized in other comprehensive income or directly in stockholders’ equity, and the current income tax for the year. Deferred tax assets are recognized to the extent that it is probable that future taxable profit against which temporary differences can be utilized will be available (see Note 21). This is assessed based on the Company’s forecast of future operating results, adjusted for significant items that are reconciled for the taxable income and the limits on the use of tax losses and other tax asset carryforwards. Deferred income tax is provided on temporary differences arising on investments in subsidiaries and associates, except where the timing of the reversal of the temporary difference can be controlled and it is probable that the temporary difference will not reverse in the foreseeable future. 4.15 Statutory employee profit sharing The statutory employee profit sharing is determined applying the rate of 10% on taxable income, adjusted as provided for by the Income Tax Law. The statutory employee profit sharing accrued is considered an ordinary expense associated with employee benefits. 4.16 Post-employment benefits and benefits for short-term employees Post-employment benefits Defined benefit plans The seniority pension to which employees are entitled after 15 years of service and after having retired at the age of 60, are expensed in the years in which the services are rendered (see Note 23). In addition, the Company has pension plans for certain employees who retire after the age of 65 (or early retirement at 60 or 55), in addition to having completed a minimum 15 years of service, which are expensed in the years in which the services are rendered (see Note 23). Under the defined benefits plan, the pension amount an employee will receive upon retirement is determined in reference to the time of service and salary determined for each case based on the plan. The legal obligation of the benefits lies with Grupo TMM, even if the plan’s assets to finance the defined benefits plan are separate. The plan’s assets may include assets specifically designated in a long-term benefit fund. The liability recognized in the consolidated statement of financial position for the defined benefits plans is the present value of the defined benefits obligation (DBO) as of the reporting date less the fair value of the plan assets. Management estimates the DBO annually with the assistance of independent actuaries, based on the standard inflation rate, the salary growth rates, and the mortality rate. The discount factors are determined near the close of each year in reference to the high-quality corporate bonds that are denominated in the currency in which the benefits will be paid and which have maturities similar to the terms of the corresponding pension liability. The net cost for the defined benefits liability period is included in the item ‘Salaries, wages and employee benefits’ in the consolidated statements of profit or loss. Indemnifications Indemnifications that are not substitutive of retirement, paid to personnel who leave the company due to restructuring or any other reason, are charged to the operations for the period when incurred or provisions are created when there is a present obligation of these events, with a probability of an outflow of resources and this obligation can be reasonably estimated. Short-term employee benefits Short-term employee benefits, including vacation entitlement, are current liabilities included in ‘Accounts payable and accrued expenses’, measured at the amount Grupo TMM expects to pay as a result of time not taken; as these liabilities are short-term, they were not discounted as their effect is considered immaterial. 4.17 Stockholders’ equity Common shares are classified as equity. Grupo TMM does not have other equity instruments in addition to its common shares. Incremental costs directly attributable to the issue of new shares or options are shown in equity as a deduction, net of taxes, from the proceeds. Incremental costs directly attributable to the issue of new shares or options are included in the cost of acquisition as part of the purchase consideration. The accumulated losses include the profit (loss) for the year and previous periods. Other components of equity capital include: • revaluation surplus, including gains and losses from the revaluation of vessels and properties; • statutory reserve corresponds to the separation of earnings withheld for this reserve; • additional paid-in capital is equivalent to the amount received in excess of the par value of the shares; • translation result represents the cumulative effect of the change in functional currency in previous years; and • actuarial gains and losses include experience adjustments (the effects of differences between the previous actuarial assumptions and what has actually occurred); and the effects of changes in actuarial assumptions. 4.18 Recognition of revenue, costs and expenses, and financing costs Revenues Company’s revenue arises mainly from services of maritime transportation, logistics and warehousing. To determine whether to recognize revenue, the Company follows a 5-step process: 1. Identifying the contract with a customer 2. Identifying the performance obligations 3. Determining the transaction price 4. Allocating the transaction price to the performance obligations 5. Recognizing revenue when/as performance obligation(s) are satisfied. The Company does not carry out transactions that involve different contracts and on which their characteristics must be combined in accordance with IFRS. Moreover, transactions are not usually carried out that involve different services as part of the same contract; therefore, the total price of the transaction for a contract in all cases is allocated to a single performance obligation, based on their relative independent sales prices. The transaction price for contracts does not consider variable payments, except for certain service payments that are not considered significant in connection with the total revenues of the Company, nor are payments in kind, nor amounts collected on behalf of third parties and nor contemplate a financing component. All revenues are recognized over time, as the Company meets performance obligations by transferring the services promised to its customers. When the Company meets a performance obligation before receiving the payment, the Company already recognizes either a contract asset or a receivable in its consolidated statement of financial position, depending upon if something else is required than only passage of time before the consideration becomes due. The Company generally does not receive payments in advance in connection with performance obligations; therefore, contractual liabilities are not required to be recognized. In obtaining these contracts, the Company incurs immaterial incremental costs. Since the amortization period of these costs would be less than one year, if capitalized, and also that those costs are immaterial, the Company makes use of the practical expedient in IFRS 15.94 and expenses them as they incur. Parcel vessels and bulk carriers These revenues are derived from the transportation of merchandise through the Company’s own shipments or third parties, usually in periods ranging between 7 and 30 days. The rate is fixed and it is set at the beginning of the contract, based on the space or capacity required by the customer. The performance obligation is met as the merchandise is transported from the point of origin to the destination. Revenues are recognized over time on a straight-line basis during the term of each contract. Given that the costs required for rendering the service under these contracts do not vary significantly, that method provides a reasonable representation of the services transferred. The amounts that remain unbilled at the end of the reporting period are presented in the consolidated statement of financial position as contractual assets, since something additional is required in addition to time elapsed in order for those amounts to become due and payable. The Company generally does not receive advances that exceed the amount of obligations met; therefore, contract liability balances are not generated. Maritime administration services They correspond to revenues for services rendered for contracting, operating, and managing shipments, mainly offshore service providers. The rate for these services is determined by applying a 2.85% profit margin to the costs incurred by the Company for rendering services. This percentage is reviewed annually, and it can be increased under certain circumstances, but by applying it beginning the year subsequent to its modification, these services are considered a single performance obligation. Accordingly

Acquisitions and disposals

Acquisitions and disposals	12 Months Ended
Acquisitions and disposals	Dec. 31, 2020
Acquisitions and disposals [Abstract]
Acquisitions and disposals	5 Acquisitions and disposals Disposal of subsidiaries Year 2020 Grupo TMM sold 100% of the shares of the subsidiaries Siremirta Corporate, S.A. de C.V., Ricalme Services, S.A. de C.V., Dogoubert, S.A.P.I. de C.V. (Split of TMM Logistics, S.A. de C.V.) and Judsony, S.A.P.I. de C.V. (Split of TMM Logistics, S.A. de C.V.) to an unrelated third party in 2020. The gain on the sale of these subsidiaries amounted to $451, which is shown in the item of ‘Other (expenses) income’ in the consolidated statements of profit or loss (see Note 19). The value of the net assets of those subsidiaries was immaterial as of the date of the sale. Year 2019 Grupo TMM sold 100% of the shares of the subsidiaries Bamorau Servicios, S.A.P.I. de C.V. and Snekke, S.A. de C.V. (tugboats) to unrelated third parties in 2019. At the date of sale, the value of the assets of those subsidiaries and the consideration received was as follows: Snekke, S.A. de C.V. (a) Bamorau Servicios, S.A.P.I. de C.V. Total Current assets Other accounts receivable $ 27,786 $ - $ 27,786 Other current assets 5,388 - 5,388 Total current assets 33,174 - 33,174 Non-current assets Property 339,038 - 339,038 Total assets $ 372,212 - $ 372,212 Short-term liabilities Other accounts payable $ 25,243 - $ 25,243 Total short-term liabilities 25,243 - 25,243 Long-term liabilities Deferred income tax 58,920 - 58,920 Total liabilities $ 84,163 - $ 84,163 Total net assets $ 288,049 - $ 288,049 Consideration transferred 543,184 24,609 567,793 Gain on the disposition of subsidiaries $ 255,135 $ 24,609 $ 279,744 In December 2019, in connection with the sale of Snekke, S.A. de C.V., and with the prior authorization of the Administración Portuaria Integral de Manzanillo, the Company transferred the rights to its concession to provide tugboat services in the port of Manzanillo in favor of the buyer, following which the Company stopped operating its tugboat business (see Note 11). The gain on the sale of these subsidiaries is shown in the item of ‘Other (expenses) income’ (see Note 19). These divestitures form part of the business plan and financial restructuring of Grupo TMM, which contemplates focusing its resources and operation in the specialized maritime and ports and terminals, through a more efficient operating structure. Year 2018 Grupo TMM sold 100% of the shares of the subsidiaries Impact Engine, S.A. de C.V., Talocaan Services, S.A. de C.V., and Ditermax Corporate, S.A. de C.V. to an unrelated third party in 2018. These divestitures form part of the business plan of Grupo TMM, which contemplates focusing its resources and operation in the specialized maritime segment. The gain on the sale of these subsidiaries amounted to $111,484, which is shown in the item of ‘Other (expenses) income’ in the consolidated statements of profit or loss (see Note 19). The value of the net assets of those subsidiaries was immaterial as of the date of the sale. Acquisition of subsidiaries Year 2020 During 2020 no company was acquired. Year 2019 On February 14, 2019, the Company acquired the remaining 50% of the shares of Servicies & Solutions Optimus, S. de R.L. de C.V., giving Grupo TMM 100% of the shares of the entity and control as of that date. The purpose of this acquisition is to continue to the develop hydrocarbon and refined oil product storage and transportation infrastructure, such as gasoline, diesel and jet fuel in the port of Tuxpan. The details of this business combination are as follows: 2019 Fair value of the consideration transferred $ 51,126 Recognized amounts of identifiable net assets Cash and cash equivalents 671 Other current assets 8,703 Land 122,481 Construction in progress 23,595 Total identifiable assets 155,450 Accounts payable 113,777 Other liabilities 373 Total liabilities assumed 114,150 Identifiable net assets $ 41,300 Goodwill on acquisition $ 9,826 Consideration transferred settled in cash $ 51,126 Cash and cash equivalents acquired receive on acquisition (671 ) Net cash outflow on acquisition $ 50,455 Goodwill of $ 9,826 is mainly related to growth expectations, expected future profitability that the management of Grupo TMM estimated at the acquisition date. As of December 31, 2019, Grupo TMM’s management decided to impair goodwill in view that the operations will not generate cash flows for the next two years as the project continues and construction remains in progress. The impairment is presented in the consolidated statement of profit or loss as part of the item “Other (expenses) income” (see Note 19).

Cash and cash equivalents

Cash and cash equivalents	12 Months Ended
Cash and cash equivalents	Dec. 31, 2020
Cash and cash equivalents [Abstract]
Cash and cash equivalents	6 Cash and cash equivalents Cash and cash equivalents as of December 31, 2020 and 2019, are summarized as follows: 2020 2019 Cash on hand $ 756 $ 902 Cash at banks 49,356 126,972 Short-term investments (a) 55,198 348,840 $ 105,310 $ 476,714 (a) Includes fix-term deposits (promissory notes) and repurchase/resell agreements with terms up to 3 days. Restricted cash As of December 2020 and 2019, restricted cash represents the amounts $37,672 and $36,085, respectively, required to guarantee payments according to the obligations arising from the debt agreements for the acquisition of vessels and guarantee for the sale of Terminal Marítima de Tuxpan, S.A. de C.V.

Trade receivables

Trade receivables	12 Months Ended
Trade receivables	Dec. 31, 2020
Trade receivables [Abstract]
Trade receivables	7 Trade receivables Trade receivables as of December 31, 2020 and 2019, are summarized as follows: 2020 2019 Maritime Shipyard $ 40,979 $ 34,325 Tugboats 13,981 19,406 Parcel tankers 14,485 18,217 Offshore vessels 29,864 4,737 Bulk carrier 98 906 Others - 173 Ports and terminals Shipping agencies 331 128,300 Port services 7,152 10,732 Commercial leases 106 93 Logistics, warehousing and other businesses Warehousing 27,145 44,820 Repair of containers 16,204 28,986 Automotive services 1,021 1,112 Other businesses - 1,165 Total trade receivables 151,366 292,972 Contract assets 56,215 65,443 Allowance for doubtful accounts (21,218 ) (14,385 ) $ 186,363 $ 344,030 All amounts are short-term. The net carrying value of trade accounts receivables is considered a reasonable approximation to fair value. The activity in the allowance for doubtful accounts is presented below: 2020 2019 Balance as of January 1 $ 14,385 $ 22,303 Impairment loss for the period 20,140 - Receivables written off during the year - (1,847 ) Allowance cancelation recognized during the year (13,307 ) (6,071 ) Balance as of December 31 $ 21,218 $ 14,385 Note 26 includes disclosures related to credit risk exposures and the analysis related to the allowance for expected credit losses. In 2020 and 2019 the impairment loss was calculated applying the expected credit loss model in accordance with IFRS 9.

Other accounts receivable

Other accounts receivable	12 Months Ended
Other accounts receivable	Dec. 31, 2020
Other accounts receivable [Abstract]
Other accounts receivable	8 Other accounts receivable Other accounts receivable as of December 31, 2020 and 2019, are summarized as follows: 2020 2019 Current Recoverable taxes $ 203,503 $ 306,327 Services for port, maritime and other operations 54,288 93,692 Employees 4,495 4,698 Insurance claims 818 773 Others 1,157 16,280 264,261 421,770 Non-current Value added tax recoverable (a) 238,000 - $ 502,261 $ 421,770 (a) During the 2020, the VAT recovery processes have been affected by practices of the tax authorities to extend the recovery periods.

Property, vessels and equipment

Property, vessels and equipment	12 Months Ended
Property, vessels and equipment	Dec. 31, 2020
Property, vessels and equipment [Abstract]
Property, vessels and equipment	9 Property, vessels and equipment Property, vessels and equipment as of December 31, 2020 and 2019 are summarized as follows: 2020 Net balances at beginning of year Additions Disposals Transfers and others Depreciation / loss from revaluation Net balances at year end Estimated useful lives(years) Vessels $ 214,938 $ - $ - $ (16,241 ) (a) $ 16,642 $ 182,055 25 Shipyard 232 - - - 42 190 40 Major vessel maintenance 15,180 - - 5,871 14,193 6,858 2.5 Buildings and facilities 299,660 3,432 - - 16,860 286,232 20 & 25 Warehousing equipment 205 616 - - 371 450 10 Computer equipment 456 214 - - 273 397 3 & 4 Terminal equipment 26,035 999 281 - 2,444 24,309 10 Ground transportation equipment 5,027 79 - 28 1,404 3,730 4,5 & 10 Other equipment 10,892 166 180 1 1,379 9,500 572,625 5,506 461 (10,341 ) 53,608 513,721 Lands 1,597,923 - - 336,422 (a) - 1,934,345 Constructions in progress 114,872 22,869 31,804 (b) (22,007 ) - 83,930 $ 2,285,420 $ 28,375 $ 32,265 $ 304,074 $ 53,608 $ 2,531,996 2019 Net beginning of year Additions Disposals Transfers and others Depreciation / loss from revaluation Net balances at year end Estimated useful lives(years) Vessels $ 782,673 $ - $ 200,119 (c), (g) $ (337,211 ) (d) $ 30,405 $ 214,938 25 Shipyard 275 - - - 43 232 40 Major vessel maintenance 41,611 1,753 12,317 (1,979 ) 13,888 15,180 2.5 Buildings and facilities 238,901 4,891 - 67,484 (e) 11,616 299,660 20 & 25 Warehousing equipment 255 419 - - 469 205 10 Computer equipment 581 249 - - 374 456 3 & 4 Terminal equipment 7,390 280 - 20,345 1,980 26,035 10 Ground transportation equipment 5,366 1,621 602 36 1,394 5,027 4,5 & 10 Other equipment 7,079 446 - 4,663 1,296 10,892 1,084,131 9,659 213,038 (246,662 ) 61,465 572,625 Lands 1,146,252 - - 451,671 (e) - 1,597,923 Constructions in progress 83,054 38,622 (f) - (6,804 ) - 114,872 $ 2,313,437 $ 48,281 $ 213,038 $ 198,205 $ 61,465 $ 2,285,420 All the amounts for depreciation and for loss from revaluation are included as part of the depreciation, amortization, and loss from revaluation on the consolidated statements of profit or loss. The accumulated depreciation on property, vessels and equipment at December 31, 2020 and 2019 is $290,056 and $261,862, respectively. (a) It is mainly comprised of the surplus for revaluation of land for $ 330,571 and a deficit for revaluation of vessels for $ 16,135. (b) Corresponds mainly to the cancellation of the project called “Terminal Quintana Roo”, derived from changes in the conditions of the project previously considered by Management. (c) On August 30, 2019, the sale of the vessel SMR Manzanillo to Bricor Servicios Portuarios Mexicanos, S.A. de C.V. by Transportación Marítima Mexicana, S.A. de C.V., a subsidiary of Grupo TMM, was complete for an amount of $15,703, generating a profit of $ 4,410. (d) It is comprised mainly of disposal of the TMM Colima vessel in the divestiture of Snekke, S.A. de C.V. of Grupo TMM for $339,038, which is partially offset by the revaluation surplus of $1,827. (e) Includes the surplus for revaluation of lands and properties for $310,833 and $66,518, respectively. (f) Corresponds to the construction of infrastructure for various projects related to the storage and transportation of hydrocarbons and refined petroleum products. (g) During 2018, the offshore vessel ‘Subsea 88’ suffered a major mishap in one of its areas and for which it stopped operating. As of December 31, 2018, Grupo TMM was making the corresponding insurance claims without a final settlement having been issued on the mishap as of that date. Since the repair of the ship requires a substantial time that affects future cash flows, Management recognized a loss in fair value in the amount of $206,076. Subsequently, in June 2019 the insurer declared the vessel ‘Subsea 88’ as a total loss. Given the result, the Company recognized the loss of the vessel for a total of $ 191,377, which was its book value as of that date. If the cost model had been used, the revalued carrying amounts for vessels, land and properties as of December 31, 2020 and 2019, would be as follows: 2020 2019 Vessels $ 102,993 $ 108,414 Lands 715,616 715,616 Properties 140,360 147,747 $ 958,969 $ 971,777 The revalued amounts include a revaluation surplus of $1,455,179 and $1,140,744 in 2020 and 2019, respectively, before taxes, which is not available for distribution to stockholders. Fair value measurement See Note 25 regarding the measuring of fair value for vessels and properties. Guarantees At the end of 2020 no vessel was under warranty, while at the end of 2019, the vessel ‘Olmeca’ was securing financial debt with ‘ACT Maritime, LLC’ (see Note 14). At the end of 2020, there were three properties securing various bank loans, while at the end of 2019 there were two properties under guarantee. Likewise, as of December 31, 2020 and 2019, there was an RTG crane under guarantee with ‘PNC Bank, N.A.’.

Leases

Leases	12 Months Ended
Leases	Dec. 31, 2020
Leases [Abstract]
Leases	10 Leases Right-of-use assets 2020 Warehouse Cranes Courtyards Major vessel maintenance Corporate building Total Gross carrying amount Balance 1 January 2020 $ 83,968 $ 3,112 $ 60,035 $ 10,834 $ 513,735 $ 671,684 Additions 216,548 8,610 - 22,135 92,170 339,463 Disposals 12,875 - - 10,834 513,735 (a) 537,444 Balance at 31 December 2020 287,641 11,722 60,035 22,135 92,170 473,703 Depreciation Balance 1 January 2020 40,212 2,197 10,794 8,667 49,715 111,585 Disposals 1,884 - - 10,834 62,146 74,864 Depreciation 44,708 4,960 11,701 6,317 15,064 82,750 Balance 31 December 2020 83,036 7,157 22,495 4,150 2,633 119,471 Carrying amount 31 December 2020 $ 204,605 $ 4,565 $ 37,540 $ 17,985 $ 89,537 $ 354,232 2019 Warehouse Cranes Courtyards Major vessel maintenance Corporate building Total Gross carrying amount Balance 1 January 2019 $ - $ - $ - $ - $ - $ - Additions 83,968 3,112 60,035 10,834 513,735 671,684 Disposals - - - - - - Balance at 31 December 2019 83,968 3,112 60,035 10,834 513,735 671,684 Depreciation Balance 1 January 2019 - - - - - - Disposals - - - - - - Depreciation 40,212 2,197 10,794 8,667 49,715 111,585 Balance 31 December 2019 40,212 2,197 10,794 8,667 49,715 111,585 Carrying amount 31 December 2019 $ 43,756 $ 915 $ 49,241 $ 2,167 $ 464,020 $ 560,099 (a) It corresponds to the cancellation of the rental agreement of the former corporate headquarters located on Av. De la Cuspide, which generates an effect on profit or loss in the amount of $113,469, which is presented in the caption of other (expenses) income (See note 19). In accordance with the agreement, the Company is bound to pay an amount of 158 thousand dollars monthly for 4 years, which will be conditioned to the rent or sale by the lessor of the real property. Lease liabilities As of December 31, 2020 and December 31, 2019, the information on leases is summarized below: 2020 Short-term Long-term Payable in Mexican pesos Warehouse $ 33,916 $ 174,894 Cranes 4,272 488 Courtyards 8,260 33,030 Major vessel maintenance 6,490 13,214 Payable in US dollars Corporate building 5,307 75,642 $ 58,245 $ 297,268 2019 Short-term Long-term Payable in Mexican pesos Warehouse $ 32,673 $ 14,094 Cranes 963 - Courtyards 10,285 41,248 Major vessel maintenance 2,269 - Payable in US dollars Corporate building 14,388 471,439 $ 60,578 $ 526,781 Grupo TMM has leased its corporate headquarters building, warehouses for the storage service, cranes for the logistics services and a major vessel maintenance. With the exception of short-term leases and low-value underlying assets, each lease is reflected on the consolidated statement of financial position as a right-of-use asset and a lease liability. Each lease generally imposes a restriction that, unless there is a contractual right for the Company to sublet the asset to another party, the right-of-use asset can only be used by the Company. Leases are either non-cancellable or may only be cancelled by incurring a substantive termination fee. Some leases contain an option to extend the lease for a further term. Grupo TMM is prohibited from selling or pledging the underlying leased assets as security. For leases over office buildings and warehouses, Grupo TMM must keep those properties in a good state of repair and return the properties. Further, Grupo TMM must insure items of leases assets and incur maintenance fees on such items in accordance with the lease contracts. The table below describes the nature of Grupo TMM’s leasing activities by type of right-of-use asset recognized in the consolidated statement of financial position: Right-of-use asset No. of right-of-use assets leased Range of remaining term (years) No. of leases with extension options No. of leases with purchase option No. of leases with variable payments linked to an index No. of leases with termination options Corporate headquarters 1 8 - - 1 - Warehouse 6 1 - 5 2 - 6 - Courtyards 5 1 – 6 5 - 5 - Cranes 1 2 - - - - Major vessel maintenance 1 4 - - - - Lease liabilities are secured with related underlying assets. Future minimum lease payments at 31 December 2020 and 2019 were as follows: Within the 1st year 1 to 3 years 3 to 5 years After 5 years Total Balance at December 31, 2020 Lease payments $ 95,914 $ 178,415 $ 152,179 $ 54,620 $ 481,128 Financial charges (37,669 ) (55,149 ) (23,783 ) (9,014 ) (125,615 ) Present values, net $ 58,245 $ 123,266 $ 128,396 $ 45,606 $ 355,513 Balance at December 31, 2019 Lease payments $ 121,847 $ 185,494 $ 198,259 $ 427,355 $ 932,955 Financial charges (61,269 ) (108,101 ) (87,429 ) (88,797 ) (345,596 ) Present values, net $ 60,578 $ 77,393 $ 110,830 $ 338,558 $ 587,359 Lease payments not recognized as a liability The Company has elected not to recognize a lease liability for short-term leases (leases with an expected term of 12 months or less) or for leases of low-value assets. Payments made under such leases are expensed on a straight-line basis. In addition, certain variable lease payments are not permitted to be recognized as lease liabilities and are expensed as incurred. The expense relating to payments not included in the measurement of the lease liability is as follows: 2020 2019 Short-term leases (a) $ 307,643 $ 296,770 Leases of low-value assets 4,820 3,696 $ 312,463 $ 300,466 (a) Corresponds to the leasing of parcel and bulk carrier vessels. At December 31, 2020, Grupo TMM was committed on short-term leases and total commitment at that date was $95,914. At December 31, 2020 Grupo TMM had no lease commitments that had not yet started. Total cash outflow for leases for the years ended December 31, 2020 and 2019 were $402,892 and $434,710, respectively.

Concession rights

Concession rights	12 Months Ended
Concession rights	Dec. 31, 2020
Concession rights [Abstract]
Concession rights	11 Concession rights As of December 31, 2020 and 2019, the concession rights are as follows: 2020 2019 Years to amortize Administración Portuaria Integral de Acapulco (a) $ 94,607 $ 94,607 10 Transportación Marítima Mexicana (b) - - - 94,607 94,607 Accumulated amortization (92,715 ) (88,931 ) Concession rights, net $ 1,892 $ 5,676 (a) As of December 31, 2020 and 2019, the Company holds concession to operate the cruise and vehicle terminal at the port of Acapulco, Guerrero. Under this concession agreements, the Company is obliged to keep the facilities included in the concession in good condition, as well as making monthly payments (fixed and variable), related to the operation (see Note 28). At December 31, 2020 and 2019, the Company was in compliance with its obligation to maintain the concession facilities in good condition. The amortization of the concession rights was $3,784 for the years ended December 31, 2020 and 2019. Monthly payments to the Administración Portuaria Integral de Acapulco were $7,507 and $7,536 in 2020 and 2019, respectively. (b) As of December 31, 2018, the Company maintained the concession rights to operate the tug services in the Port of Manzanillo, Colima. This concession was renewed in October 2014, expiring on January 16, 2023, with the possibility of being renewed for another eight years. In connection with the December 2019 sale of Snekke, S.A. de C.V. and with the prior authorization of the Administración Portuaria Integral de Manzanillo, the Company transferred the rights of this concession in favor of the buyer (see Notes 1 and 5). As of the date of this sale, the total value of the concession rights, which amounted to $30,266, had been fully amortized.

Intangible assets

Intangible assets	12 Months Ended
Intangible assets	Dec. 31, 2020
Intangible assets [Abstract]
Intangible assets	12 Intangible assets Intangible assets as of December 31, 2020 and 2019, are summarized as follows: 2020 Net balances at beginning of year Additions Transfers and others Amortization Net balances at year end Estimated useful life (years) Software $ 15,956 $ 10,508 (b) $ - $ 742 $ 25,722 3 y 5 Trademark (a) 125,528 - - 125,528 Indefinite $ 141,484 $ 10,508 $ - $ 742 $ 151,250 2019 Net balances at beginning of year Additions Transfers and others Amortization Net balances at year end Estimated useful life (years) Software $ 909 $ 19,048 $ - $ 4,001 $ 15,956 3 y 5 Trademark (a) 125,528 - - - 125,528 Indefinite $ 126,437 $ 19,048 $ - $ 4,001 $ 141,484 (a) Corresponds to the rights on the Marmex trademark associated with the specialized maritime division segment, specifically the offshore vessels operation. This trademark is subject to annual impairment testing (see Note 13). (b) Corresponds mainly to the SAP Hana system upgrade project. The accumulated amortization of intangible assets as of December 31, 2020 and 2019, is $3,850 and $7,096, respectively.

Impairment of long-lived assets

Impairment of long-lived assets	12 Months Ended
Impairment of long-lived assets	Dec. 31, 2020
Impairment of long-lived assets [Abstract]
Impairment of long-lived assets	13 Impairment of long-lived assets As of December 31,2020, and 2019, Grupo TMM had performed annual impairment tests. The recoverable amounts of the cash generating units were determined based on calculations of the value in use and fair value less costs of sale as follows: Vessels and trademark Vessels are identifiable assets that individually generate cash flows which are largely independent from the flows from other assets or groups of assets. The trademark is considered an asset that does not generate flows independently, therefore this was grouped with the vessels as a cash-generating unit (specialized maritime division segment) together with other long-lived assets in this segment. The recovery value for these assets was determined as the higher between their value in use and their market value, less selling costs. As of December 31, 2020, and 2019, no impairment losses were determined for these assets. Properties The recoverable value of properties was determined as their fair value less costs of sale, which are considered immaterial in terms of the fair value. The determination of fair value is described in Note 25. At December 31, 2020 and 2019, no impairment losses were determined for these assets. Corporate assets and other long-lived assets These assets are not identified with any cash-generating unit, therefore these were evaluated at the Grupo TMM level. The recoverable amount of these assets was determined as their value in use. At December 31, 2020 and 2019, no impairment losses were determined for these assets. The recoverable amounts for cash-generating units were determined based on calculations of the value in use, covering a detailed three-year projection, followed by an extrapolation of the cash flows expected for the useful lives remaining for the assets using the growth rates determined by Management. The present value of the cash flows expected for each segment was determined applying an appropriate discount rate. 2020 2019 Growth rate Discount rate Growth rate Discount rate Vessels 2.00 % 7.45 % 2.00 % 7.19 % Growth rates The growth rates reflect the long-term average for these rates for the specialized maritime segment (all publicly available). Discount rates The discount rate reflects adequate adjustments associated with the market risk and the specific risk factors. Cash flow assumptions The key assumptions of Management for the specialized maritime segment include stable profit margins, which have been determined based on experience in this market. Grupo TMM Management considers this to be the best information available to forecast this market. The cash flow projections reflect stable profit margins achieved before the period covered by said projections. No consideration has been given to efficiency improvements and prices and salaries reflect the inflation projected for the industry, which are publicly available. In addition to the considerations described above for determining the value in use of assets and the cash-generating units described above, Management is currently not aware of any other probable change that could require changes in their estimate. However, the estimate for the recoverable amount for the specialized maritime segment is particularly sensitive to the discount rates. If the discount rate used increases 1%, the value in use would decrease up to 4.91% in terms of the value determined, the value that continues to exceed the carrying value of the aforementioned assets.

Financial assets and liabilitie

Financial assets and liabilities	12 Months Ended
Financial assets and liabilities	Dec. 31, 2020
Financial assets and liabilities [Abstract]
Financial assets and liabilities	14 Financial assets and liabilities Categories of financial assets and liabilities The financial assets and liabilities as of December 31, 2020 and 2019, are summarized as follows: 2020 2019 Financial assets Valued at amortized cost Cash and cash equivalents $ 105,310 $ 476,714 Restricted cash 37,672 36,085 Trade receivables 130,148 278,587 Other accounts receivable 60,758 115,443 Related parties 42,228 163,344 Total current financial assets $ 376,116 $ 1,070,173 Financial liabilities Valued at amortized cost Short-term portion of the financial debt $ 129,085 $ 139,189 Trade payables 228,959 262,159 Accounts payable and accrued expenses 486,827 461,892 Related parties 1,458 87,573 Total short-term portion of the financial debt 846,329 950,813 Long-term financial debt 53,644 118,737 Total financial liabilities $ 899,973 $ 1,069,550 As of December 31, 2020, and 2019, the carrying value of the financial assets and liabilities at amortized cost is considered similar to their fair value. Financial debt The information for financing as of December 31, 2020 and 2019 is summarized as follows: 2020 2019 Short-term Long-term Short-term Long-term Payable in Mexican pesos Daimler Financial Services México, S. de R.L. de C.V $ 16,333 $ - $ 9,504 $ 9,074 Recognition of debt and substitution of debtor for $40.9 million at a fixed rate of 12%, with monthly payments of principal and interest and maturing in November 2019. In order to improve the profile of the schedule of payments, a new debt recognition was formalized on October 11, 2018, in the amount of $28 million at a 12.9% fixed rate, with monthly payments on principal and interest, due October 2021. In order to face the effects of the Covid-19 pandemic, the Company obtained two grace periods of 3 months each for the principal payment from April to September 2020, extending the term of the loan to January 2022. The Company is currently in the process of negotiating with the finance company to restructure the debt repayment schedule. Banco Autofin México, S.A. Institución de Banca Múltiple 23,352 12,773 23,319 28,477 Five lines of credit with mortgage surety for $45.8, $34.6, $25.5, $21.6, and $8.4 million at a variable rate of the 28-day TIIE plus 450 basis points, with monthly payments of principal and interest, maturing September 2021. On November 26, 2018, a new line of credit was drawn down in the amount of $20 million at a variable rate at 28-day TIIE, plus 550 base points, due November 2023. In order to face the effects of the Covid-19 pandemic, the Company obtained a grace period of 6 months in the payment of principal of 4 of the 6 lines, the period applies from the months of January to June of 2020, extending the maturity of those lines correspondingly. INPIASA, S.A. de C.V. 1,435 - 1,566 1,044 Contract for line of credit, the first for $15.7 million at a variable rate of the 28-day TIIE plus 450 basis points, with monthly payments of principal and interest, and maturing August 2021. HSBC, S.A. 951 - 1,629 543 $9.77 million line of credit at a variable rate of the 28-day TIIE plus 300 points, with monthly payments of principal and interest, and maturing April 2021. In order to face the effects of the Covid-19 pandemic, the Company obtained a grace period of 3 months in the payment of principal from the months of May to July 2020, extending the term of each credit line 3 months. Banco del Bajío, S.A. Intemza 211 - 842 - $9.36 million line of credit at a variable rate of the 28-day TIIE plus 250 points, with monthly payments of principal and interest, and maturing August 2020. In order to face the effects of the Covid-19 pandemic, the Company obtained a 6-month grace period in the payment of principal from April to September 2020, extending the term of each credit line 6 months. Banco del Bajío, S.A. - - 23,227 - $24.0 million line of credit at a variable rate of the 28-day TIIE plus 600 points, with monthly payments of principal and interest; and maturing in March 2020. 2020 2019 Short-term Long-term Short-term Long-term Banco del Bajío, S.A. 1,714 9,571 - - $12.0 million line of credit line with a mortgage guarantee for $30.0 million, variable rate of TIIE 28 days plus 600 points, with monthly payments of principal and interest, maturing in July 2027. Portafolio de Negocios, S.A. de C.V. SOFOM 2,738 6,334 - - Line of credit for $10.0 million with a fixed rate of 15.0%, with monthly payments of principal and interest; maturity in July 2023, without prepayment penalty. Other investors 12,000 - - - Two unsecured loans were contracted, each for $6.0 million at a fixed rate of 15.0% per annum, with principal and interest payments due, originally in October 2020. The Company is in negotiation extending the payment term, as well as the conditions of both credits. Interest payable 563 - 410 - 59,297 28,678 60,497 39,138 Total financial debt in Mexican pesos ACT Maritime, LLC - - 15,843 57,349 A line of credit at 5 years was contracted in September 2018 in the amount of $5.52 million dollars with a variable Libor rate at 90 days plus 750 points, with quarterly payments of principal and interest, due September 2023. The total credit line that it had with DVB Bank America NV was totally liquidated with the proceeds of this line. In December 2020, the Company prepaid the total credit line, with the advance received for the sale of the Olmeca vessel (see Note 29). Others 59,806 - 56,618 - Unsecured credits were contracted, each one amounting to $3 million dollars at a fixed rate of 11.25%, with semiannual payments of principal and interest, originally due January 2016. Both credits were contracted again in January 2017, and $1 million dollars on one of them was paid and both were due in July 2017. The payment rescheduling and outstanding balance amounting to $5 million dollars were formalized in July 2017, with a fixed rate of 11.25% with monthly payments on interest and principal, due July 2018. A new rescheduling of payments and unpaid balance amounting to $4.5 million dollars was formalized in July 2018, with an 11.25% fixed rate with monthly interest payments. The principal amounting to $500 thousand dollars was paid in July 2018, and the balance of $4 million dollars is due in July 2019. 2020 2019 Short-term Long-term Short-term Long-term In order to improve the amortization profile, the Company continued its negotiations with creditors to define a new amortization schedule. On December 20, 2019, the payment of $ 1.0 million dollars was made. In July 2020, the rescheduling of payments for $3.0 million dollars was formalized, with a fixed rate of 11.25% with monthly payments of interest and principal due in July 2021. The Company is in negotiations to improve the conditions and amortization profile of the balance of the current credit. Hewlett Packard 4,180 14,679 2,354 9,263 Two lines of credit for $607.8 dollars and $201.6 dollars, at a fixed rate of 6.84% and 6.13%, monthly payments of principal and interest on unpaid balances and maturing in March and October 2024, respectively. In order to face the effects of the Covid-19 pandemic, the Company obtained a grace period of 3 months in the payment of principal for the months of May to July, extending the term of each credit line 3 months. In order to continue with the Company’s technological transformation strategy, 3 additional simple credit lines were contracted for $86.6 thousand dollars, $96.9 thousand dollars and $ 252.1 thousand dollars, at a fixed rate of 5.96%, 7.16% and 4.58% fixed annual, respectively, monthly payments of principal and interest on unpaid balances and maturing in March, April and August 2025. PNC, Bank, N.A. 3,429 10,287 3,246 12,987 Line of credit with collateral for $860 thousand dollars, at a fixed rate of 4.40%, semiannual payments of principal and interest on unpaid balances and maturing in July 2024. Interest payable 2,373 - 631 - Total financial debt in US dollars 69,788 24,966 78,692 79,599 Total financial debt $ 129,085 $ 53,644 $ 139,189 $ 118,737 (a) They correspond to judicial and private agreements signed for the debt recognition with respect to Deposit Certificates secured and backed by Almacenadora de Depósito Moderno, S.A. de C.V. (ADEMSA), a related party. Covenants Some of the agreements related to the abovementioned loans contain certain covenants including the observance of certain financial ratios, restrictions on dividend payments, and sales of assets, among others. As of December 31, 2020, and 2019, Grupo TMM and subsidiaries complied with the covenants set forth in those contracts. The interest expense on the financial debt was $38,558 and $69,796 for the periods of twelve months ended December 31, 2020 and 2019, respectively. The maturity of the long-term financial debt as of December 31, 2020 and 2019 is as follows: Maturity 2020 2019 2021 $ - $ 57,017 2022 23,638 31,861 2023 16,315 25,427 2024 8,275 4,427 2025 2,703 5 2026 2,713 - $ 53,644 $ 118,737

Balances and transactions with

Balances and transactions with related parties	12 Months Ended
Balances and transactions with related parties	Dec. 31, 2020
Balances and transactions with related parties [Abstract]
Balances and transactions with related parties	15 Balances and transactions with related parties The accounts payable and transactions with related parties as of December 31, 2020 and 2019 are summarized as follows: 2020 2019 Receivable Payable Receivable Payable TMM División Marítima, S.A. de C.V. (a) $ 42,228 $ - $ 163,344 $ - SSA México, S.A. de C.V. (b) - 1,458 - 87,573 $ 42,228 $ 1,458 $ 163,344 $ 87,573 (a) The accounts receivable is related to the maritime services provided to TMM DM by Grupo TMM. In (b) The accounts payables to SSA México, S.A. de C.V. are largely due to subagency services that this related party provides to Grupo TMM. The most relevant transactions with related parties as of December 31, 2020, 2019 and 2018 are summarized as follows: 2020 2019 2018 Revenue: Maritime services (a) $ 131,137 $ 159,772 $ 187,426 Shipping agency services (b) 499 758 - Leases (c) - - 66 $ 131,636 $ 160,530 $ 187,492 Costs: Sub-agency commissions (d) $ 107,692 $ 264,743 $ - Expenses: Other expenses (e) $ 440 $ 391 $ 366 (a) Maritime services between TMM Dirección Corporativa, S.A. de C.V, subsidiary of Grupo TMM, and TMM DM. (b) Shipping agency services between Administradora Marítima TMM, S.A.P.I. de C.V., subsidiary of Grupo TMM, and TMM DM. (c) Grupo TMM, S.A.B. leasing operation with SSA México, S.A. de C.V. in Acapulco, Guerrero. (d) Shipping agency servicies provided by SSA México, S.A. de C.V. to Administradora Marítima TMM, S.A.P.I. de C.V. (e) Management consulting provided by SSA México, S.A. de C.V. to Administración Portuaria Integral de Acapulco, S.A. de C.V. Transactions involving executive personnel for the years ended December 31, 2020, 2019 and 2018, include the following expenses: 2020 2019 2018 Short-term benefits Salaries $ 36,003 $ 40,851 $ 33,790 Social security costs 1,633 497 462 $ 37,636 $ 41,348 $ 34,252

Accounts payable and accrued ex

Accounts payable and accrued expenses	12 Months Ended
Accounts payable and accrued expenses	Dec. 31, 2020
Accounts payable and accrued expenses [Abstract]
Accounts payable and accrued expenses	16 Accounts payable and accrued expenses Accounts payable and accrued expenses at December 31, 2020 and 2019, are shown as follows: 2020 2019 General expenses $ 259,151 $ 212,595 Operating expenses 57,929 96,004 Purchased services 89,976 95,470 Taxes payable 38,281 37,637 Salaries and wages 924 3,256 Others 78,847 54,567 $ 525,108 $ 499,529

Stockholders' equity

Stockholders' equity	12 Months Ended
Stockholders' equity	Dec. 31, 2020
Stockholders' equity [Abstract]
Stockholders' equity	17 Stockholders’ equity Capital stock As of December 31, 2020, and 2019, the Company’s capital stock is comprised of 102,182,841 shares outstanding, registered, without par value, and with voting rights, which may be held by Mexican nationals, investors, or companies that include in their bylaws the exclusion of foreigners clause. Foreigners may acquire economic rights in the Company’s common shares through ordinary participation certificates (‘CPOs’), with each CPO corresponding to one common share. In the United States, the Company’s ADSs, each representing five CPOs, trade on the OTC market under the symbol GTMAY. The underlying TMM common shares for the ADSs are traded on the Mexican Stock Exchange under the listing code TMM A. Net tax profit account (CUFIN) As of December 31, 2020, and 2019, the restated balance of the Net Taxable Income Account (CUFIN for its acronym in Spanish) of the Parent Company amounts to $3,727,180 and $3,613,359, respectively, which was generated up to December 31, 2013. No new balances have been generated in this account thereafter. Dividends or earnings distributed to stockholders that are paid out of the CUFIN balance generated up to December 31, 2014 will not be subject to income tax until that balance is exhausted. Dividends not drawn from the CUFIN, in addition to the above, will continue to be subject to income tax, paid by the entity, based on the general rate set by law, which is definitive and may be credited against the income tax for this and the next two years. The balance in these accounts is susceptible to adjustment to the distribution date using the Mexican Consumers’ Price Index (INPC). Capital decreases As of December 31, 2020, and 2019, the current balance in the Capital Contribution Account (CUCA for its acronym in Spanish) is $4,868,700 y $4,720,020, respectively. In the event of capital reimbursement or decreases in favor of stockholders, the surplus for said reimbursement on this amount will be treated as a distributed earning. In the event the equity capital exceeds the balance in the CUCA, the difference will be considered a dividend or distributed earning subject to the payment of income tax. If the earnings in reference come from the CUFIN, there will be no corporate tax due for the capital decrease or reimbursement. Otherwise, these will be treated as dividends or distributed earnings. Other components of equity Details of other components of equity as of December 31, 2020 and 2019, as follows: Statutory Defined benefit Premium on convertible obligations Translation result Revaluation surplus Total Balance as of December 31, 2018 $ 216,948 $ (125 ,417 ) $ 77,106 $ (247,668 ) $ 785,975 $ 706,944 Revaluation of assets - - - - 379,420 379,420 Defined benefit plan - 2,354 - - - 2,354 Reclassification from disposal of properties and depreciation - - - - (202,228 ) (a) (202,228 ) Total before taxes - 2,354 - - 177,192 179,546 Tax expense - (706 ) - - (113,826 ) (114,532 ) Total net of taxes - 1,648 - - 63, 366 65,014 Balance as of December 31, 2019 216,948 (123,769 ) $ 77,106 $ (247,668 ) $ 849,341 $ 771,958 Statutory Defined benefit Premium on convertible obligations Translation result Revaluation surplus Total Revaluation of assets - - - - 314,436 (b) 314,436 Defined benefit plan - 10,953 - - - 10,953 Reclassification from revaluation of assets - (55 ) (a) (55 ) Total before taxes - 10,953 - - 314,381 325,334 Tax expense - (3,286 ) - - (94,331 ) (97,617 ) Total net of taxes - 7,667 - - 220,050 227,717 Balance as of December 31, 2020 $ 216,948 $ (116,102 ) $ 77,106 $ (247,668 ) $ 1,069,391 $ 999,675 (a) It corresponds to the reclassification of the revaluation surplus to accumulated losses from the sale of properties and disposals of vessels, as well as the depreciation for the period of revaluation of properties and vessels. (b) Corresponds to the revaluation of the land of the project called “Liquid Storage Terminal”, derived from changes in the conditions of the project generated by obtaining permits, the revaluation allows the Management to know the fair value of the property based on at its best use.

Revenues

Revenues	12 Months Ended
Revenues	Dec. 31, 2020
Revenues [Abstract]
Revenues	18 Revenues The revenues as of December 31, 2020, 2019 and 2018, are summarized as follows: 2020 2019 2018 Maritime Parcel tankers $ 340,767 $ 287,140 $ 312,305 Maritime administration services 131,136 159,772 187,426 Shipyard 100,864 164,917 138,517 Bulk carrier 85,085 162,897 144,664 Tugboats - 81,707 70,037 Offshore vessels 93,373 12,072 56,506 Ports and terminals Port services 41,659 90,144 101,688 Shipping agencies 27,530 79,695 64,283 Logistics, warehousing and other businesses Repair of containers 196,584 211,171 234,534 Warehousing 139,042 171,867 160,991 Intermodal terminal 41,794 49,157 47,581 Automotive services 5,447 5,144 4,534 Total consolidated revenue $ 1,203,281 $ 1,475,683 $ 1,523,066 The Company’s revenues do not show any particular grouping characteristic, such as by type of customer (government and private), geographic zone, etc. The main grouping is shown based on the type of revenue for each segment. Moreover, as discussed in Note 4.18, all of the Company’s revenues are recognized over time.

Other (expenses) income

Other (expenses) income	12 Months Ended
Other (expenses) income	Dec. 31, 2020
Other (expenses) income [Abstract]
Other (expenses) income	19 Other (expenses) income Other (expenses) income as of December 31, 2020, 2019 and 2018, is summarized as follows: 2020 2019 2018 Gain (loss) from the sale of subsidiaries (see Note 5) $ 451 $ 279,744 $ 111,484 Recoveries of taxes paid in prior years, net of expenses for recovery (11,145 ) (16,595 ) (3, 919 ) Cancellation of projects (31,804 ) (18,944 ) (5,604 ) Forgiveness of accounts receivable (98,859 ) - - Expenses related to the cancellation of the corporate building lease (113,469 ) - - Goodwill impairment (see Note 5) - (9, 826 ) - Other, net (2,399 ) (472 ) 664 $ (257,225 ) $ 233,907 $ 102,625

Interest expense and other fina

Interest expense and other financial costs	12 Months Ended
Interest expense and other financial costs	Dec. 31, 2020
Interest expense and other financial costs [Abstract]
Interest expense and other financial costs	20 Interest expense and other financial costs This line at December 31, 2020, 2019 and 2018, is comprised as follows: 2020 2019 2018 Interest on financial debt $ 38,558 $ 69,796 $ 80,580 Interest expense on leasing arrangements 33,535 70,225 - Other financial expenses 2,066 5,303 2,146 Amortization of transaction cost associated with financial debt 1,495 1,551 2,164 $ 75,654 $ 146,875 $ 84,890

Income tax and tax loss carryfo

Income tax and tax loss carryforwards	12 Months Ended
Income tax and tax loss carryforwards	Dec. 31, 2020
Income tax and tax loss carryforwards [Abstract]
Income tax and tax loss carryforwards	21 Income tax and tax loss carryforwards Income Tax Results for the year Grupo TMM and Subsidiaries incurred combined tax losses for the years ended December 2020 and 2019, in the amounts of $(383,647) and $(397,746), respectively. Most of the companies that generated taxable income fully offset them against tax losses from prior years. Income tax recognized in profit or loss corresponds to subsidiaries that generated taxable income of $36,243 and $48,373, respectively. The difference between taxable and book income is due primarily to the net effect of the gain or loss on inflation recognized for tax purposes, the difference between tax and book amortization and depreciation, non-deductible expenses, as well as certain temporary differences reported in different periods for financial and tax purposes. In accordance with the currently enacted Income Tax Law, the rate for 2018, 2019, 2020, and subsequent years is 30%. The provision for income tax recognized in the statement of profit or loss for the years ended December 31, 2020, 2019 and 2018, is as follows: 2020 2019 2018 Income tax $ (10,873 ) $ (14,512 ) $ (4,799 ) Income tax (agreement) (a) - (85,196 ) - Deferred income tax 30,207 35,133 - Total income tax expense $ 19,334 $ (64,575 ) $ (4,799 ) (a) During 2019, Grupo TMM agreed with the Tax Administration Service to resolve the Company’s outstanding tax liabilities for the fiscal year 2010 through payment of 2.6 million pesos over a period of 36 months beginning in November 2019. The reconciliation between the provision for income tax based on the statutory income tax rate and the provision recorded by the Company at December 31, 2020, 2019 and 2018, is as follows: 2020 2019 2018 (Loss) profit before taxes $ (422,490 ) $ 95,867 $ 28,348 Income tax 126,747 (28,760 ) (8,504 ) Increase (decrease) from: Difference in depreciation and amortization (86,033 ) (180,395 ) (56,356 ) Revaluation surplus 94,331 113,826 (48,424 ) Income recognized in advance - - (62 ) Materials and supplies 3,625 (31,073 ) (19,888 ) Inflationary and currency exchange effects on monetary assets and liabilities, net (4,035 ) 1,236 (26,686 ) Tax losses – net 12,054 19,277 206,485 Provisions and allowance for doubtful accounts (78,527 ) 54,214 (44,609 ) Forgiveness of accounts receivable (29,658 ) - - Difference between the tax and book value for the sale of assets (14,276 ) (13,133 ) (15,551 ) Difference between the tax and book value for the sale of shares of subsidiaries (104 ) 97,284 20,800 Non-deductible expenses (4,790 ) (11,855 ) (12,004 ) Income tax (agreement) - (85,196 ) - Benefit (provision) for income tax $ 19,334 $ (64,575 ) $ (4,799 ) The components of deferred tax liability at December 31, 2020 and 2019, are comprised as follows: 2020 2019 Portion of tax loss carryforwards for subsequent years $ 350,272 $ 338,218 Inventories and provisions – net 41,080 51,657 Concession rights and property, vessels and equipment (706,976 ) (638,089 ) Total deferred tax liability $ (315,624 ) $ (248,214 ) As of December 31, 2020, the Company’s Management carried out the evaluation of the amount of tax losses that will be recoverable and determined based on projections that the effect of the deferred tax asset determined in the year will be realized at 51% based on the information available at the date of issuance of the consolidated financial statements. Tax loss carryforwards As of December 31, 2020, Grupo TMM and its subsidiaries, report the following cumulative tax losses, which are restated applying the National Consumer Price Index (NCPI) factors in accordance with Mexican law. Year in which the loss was incurrred Amounts Year of expiration 2011 $ 66,483 2021 2012 168,689 2022 2013 199,466 2023 2014 142,463 2024 2015 69,170 2025 2016 410,181 2026 2017 103,125 2027 2018 216,620 2028 2019 491,902 2029 2020 434,618 2030 $ 2,302,717

Segment reporting

Segment reporting	12 Months Ended
Segment reporting	Dec. 31, 2020
Segment reporting [Abstract]
Segment reporting	22 Segment reporting The Company operates in the following segments: i) specialized maritime transportation, ii) logistics, iii) ports and terminals and iv) warehousing. Specialized maritime transportation operations (‘Specialized Maritime Division’) include transportation of bulk liquid products, materials and provisions for drilling platforms, Specialized maritime division Logistics division Ports and terminals division Warehousing division Other businesses and shared accounts Total consolidated December 31, 2020 Revenue $ 751,225 $ 243,825 $ 69,189 $ 139,042 $ - $ 1,203,281 Costs and expenses (634,919 ) (217,699 ) (74,521 ) (110,309 ) - (1,037,448 ) Corporate expenses - - - - (96,345 ) (96,345 ) Depreciation and amortization (41,764 ) (22,571 ) (15,423 ) (45,261 ) (16,032 ) (141,051 ) Transportation profit (loss) $ 74,542 $ 3,555 $ (20,755 ) $ (16,528 ) $ (112,377 ) $ (71,563 ) Costs, expenses and revenue not allocated (331,593 ) Net profit for the year $ (403,156 ) Total assets by operating segment $ 1,060,473 $ 250,188 $ 1,664,819 $ 539,521 $ - $ 3,515,001 Shared assets - - - - 515,546 515,546 Total assets $ 1,060,473 $ 250,188 $ 1,664,819 $ 539,521 $ 515,546 $ 4,030,547 Total liabilities by operating segment $ 363,098 $ 141,723 $ 498,233 $ 345,091 $ - $ 1,348,145 Shared liabilities - - - - 434,994 434,994 Total liabilities $ 363,098 $ 141,723 $ 498,233 $ 345,091 $ 434,994 $ 1,783,139 Total capital expenditures by segment $ 7,608 $ 33 $ 5,137 $ 4,086 $ - $ 16,864 Shared capital expenditures - - - - 11,511 11,511 Total capital expenditures $ 7,608 $ 33 $ 5,137 $ 4,086 $ 11,511 $ 28,375 December 31, 2019 Revenue $ 868,505 $ 265,472 $ 169,839 $ 171,867 $ - $ 1,475,683 Costs and expenses (652,157 ) (232,386 ) (122,882 ) (132,792 ) - (1,140,217 ) Corporate expenses - - - - (173,726 ) (173,726 ) Depreciation and amortization (66,306 ) (19,474 ) (15,186 ) (41,516 ) (40,398 ) (182,880 ) Transportation profit (loss) $ 150,042 $ 13,612 $ 31,771 $ (2,441 ) $ (214,124 ) $ (21,140 ) Costs, expenses and revenue not allocated 52,432 Net profit for the year $ 31,292 Total assets by operating segment $ 1,285,751 $ 266,079 $ 1,763,135 $ 386,418 $ - $ 3,701,383 Shared assets - - - - 862,392 862,392 Total assets $ 1,285,751 $ 266,079 $ 1,763,135 $ 386,418 $ 862,392 $ 4,563,775 Total liabilities by operating segment $ 431,893 $ 158,203 $ 567,030 $ 173,616 $ - $ 1,330,742 Shared liabilities - - - - 810,241 810,241 Total liabilities $ 431,893 $ 158,203 $ 567,030 $ 173,616 $ 810,241 $ 2,140,983 Total capital expenditures by segment $ 12,048 $ 598 $ 24,086 $ 494 $ - $ 37,226 Shared capital expenditures - - - - 11,055 11,055 Total capital expenditures $ 12,048 $ 598 $ 24,086 $ 494 $ 11,055 $ 48,281 Specialized maritime division Logistics division Ports and terminals division Warehousing division Other businesses and shared accounts Total consolidated December 31, 2018 Revenue $ 909,455 $ 286,649 $ 165,971 $ 160,991 $ - $ 1,523,066 Costs and expenses (727,535 ) (248,364 ) (106,993 ) (165,388 ) (473 ) (1,248,753 ) Corporate expenses - - - - (198,404 ) (198,404 ) Depreciation and amortization (59,451 ) (2,772 ) (9,616 ) (1,305 ) (7,133 ) (80,277 ) Transportation profit (loss) $ 122,469 $ 35,513 $ 49,362 $ (5,702 ) $ (206,010 ) $ (4,368 ) Costs, expenses and revenue not allocated 27,917 Net profit for the year $ 23,549 Total assets by operating segment $ 1,820,844 $ 240,024 $ 866,849 $ 294,326 $ - $ 3,222,043 Shared assets - - - - 559,041 559,041 Total assets $ 1,820,844 $ 240,024 $ 866,849 $ 294,326 $ 559,041 $ 3,781,084 Total liabilities by operating segment $ 887,042 $ 159,956 $ 280,473 $ 66,583 $ - $ 1,394,054 Shared liabilities - - - - 262,772 262,772 Total liabilities $ 887,042 $ 159,956 $ 280,473 $ 66,583 $ 262,772 $ 1,656,826 Total capital expenditures by segment $ 42,745 $ 592 $ 13,176 $ 582 $ - $ 57,095 Shared capital expenditures - - - - 29,188 29,188 Total capital expenditures $ 42,745 $ 592 $ 13,176 $ 582 $ 29,188 $ 86,283

Employee benefits

Employee benefits	12 Months Ended
Employee benefits	Dec. 31, 2020
Employee benefits [Abstract]
Employee benefits	23 Employee benefits Expense for employee benefits The expenses recognized for employee benefits are: 2020 2019 2018 Salaries, benefits and inherent $ 317,776 $ 320,827 $ 347,403 Pensions – defined benefit plans 23,623 22,873 21,211 $ 341,399 $ 343,700 $ 368,614 The long-term liabilities recognized for pensions and other employee remunerations in the consolidated statement of financial position are comprised as follows: 2020 2019 Long-term: Pensions and seniority premium $ 136,832 $ 141,014 Termination of employment 13,365 10,467 $ 150,197 $ 151,481 The short-term liabilities for employee benefits, are included in the line ‘Accounts payable and accrued liabilities’ in the consolidated statements of financial position, which at December 31, 2020 and 2019, amount to $924 and $3,256, respectively. Remunerations on the termination of employment The seniority premiums and the retirement plan (‘pensions’) obligations are based on actuarial calculations using the projected unit credit method. Pension benefits are based mainly on years of service, age, and salary level upon retirement. The amounts charged to operations include the amortization of the cost of past services over the average time of service remaining. The Company continues with its policy of recognizing actuarial losses and gains for seniority premiums and pensions in the consolidated statement of operations, the actuarial (loss) gain net of taxes for 2020 and 2019 was $7,667 and $1,648, respectively. The plan exposes Grupo TMM to such risks as interest rate, investment, mortality, and inflation. Interest rate risk The present value of the defined benefits obligation is calculated using a discount rate making reference to the market performance of high-quality corporate bonds. The estimated term for the bonds is consistent with the estimated term for the defined benefits obligation and is denominated in pesos. A decrease in the market performance of high-quality corporate bonds will increase the defined benefits obligation of the Company, although this is expected to be partially compensated by an increase in the fair value of certain of the plan’s assets. Investment risk The plan assets are predominantly capital and debt instruments traded on the Mexican Stock Exchange which are considered low risk. Mortality risk The Company provides benefits for life to those who are covered by the defined benefits liability. An increase in the life expectancy of such persons will increase the defined benefits liability. Inflation risk A significant proportion of the defined benefits obligation is linked to inflation. An increase in the inflation rate will increase the Company’s obligation. The details of the net cost for the period for seniority premiums and termination of employment, and also the basic actuarial estimates for the calculation of these labor obligations is shown as follows: 2020 2019 Pensions and seniority premiums Termination of employment Pensions and seniority premiums Termination of employment Current service cost $ 4,541 $ 1,727 $ 4,709 $ 2,178 Interest cost 11,892 867 13,643 2,343 Net cost for the period $ 16,433 $ 2,594 $ 18,352 $ 4,521 At December 31, 2020 and 2019, the reserve for pensions and seniority premiums, and also for the termination of employment, is comprised as follows: 2020 2019 Pensions and seniority premiums Termination of employment Pensions and seniority premiums Termination of employment Defined benefit obligations $ 139,763 $ 13,365 $ 144,044 $ 10,467 Plan assets (2,931 ) - (3,030 ) - Total reserve $ 136,832 $ 13,365 $ 141,014 $ 10,467 As of December 31, 2020, and 2019, the defined benefit obligations (DBO) for pensions and seniority premiums, and also for the reserve for termination of employment, are comprised as follows: 2020 2019 Pensions and seniority premiums Termination of employment Pensions and seniority premiums Termination of employment DBO at beginning of period $ 144,044 $ 10,467 $ 154,128 $ 25,604 Current service cost 4,541 1,727 4,709 2,178 Interest cost 11,892 867 13,643 2,343 Benefits paid (2,072 ) (70 ) (338 ) - Benefits paid from plan assets (7,315 ) - (7,617 ) - Miscellaneous - - (304 ) - Past service cost - - (16,822 ) (21,365 ) Actuarial gain or losses (11,327 ) 374 (3,355 ) 1,707 DBO at end of period $ 139,763 $ 13,365 $ 144,044 $ 10,467 The plan assets as of December 31, 2020 and 2019 are comprised as follows: 2020 2019 Value of the fund at beginning of year $ 3,030 $ 3,126 Expected return on assets (356 ) 310 Plan contributions 7,315 7,617 Benefits paid (7,315 ) (7,617 ) Interests on plan assets 257 208 Miscellaneous - (614 ) Found value at end of the year $ 2,931 $ 3,030 The changes in the pension plan, seniority premium, and termination of employment plan as of December 31, 2020 and 2019 are as follows: 2020 2019 Reserve for obligations at the beginning of the period $ 151,481 $ 176,606 Cost for the period 19,027 22,873 Interest income (257 ) (208 ) Contributions to the plan (7,315 ) (7,617 ) Benefits paid on pension plan (2,142 ) (338 ) Miscellaneous 356 - Actuarial gain or losses (10,953 ) (1,648 ) Past service cost - (38,187 ) Reserve for obligations at the end of the period $ 150,197 $ 151,481 The significant actuarial assumptions used for the valuation are: 2020 2019 Discount rate 7.50 % 8.50 % Salary increase rate 4.00 % 4.00 % Inflation rate 3.50 % 3.50 % Average working life expectancy 16.10 18.30 These assumptions were prepared by Management with the assistance of independent actuaries. The discount factors are determined near the end of each year making reference to the market performance of high-quality corporate bonds denominated in the currency in which the benefits will be paid and which have similar maturities to the terms for the pension obligation corresponding. Other assumptions are based on actual reference parameters and Management’s historical experience. On December 31, 2020 and 2019, approximately 12% and 18% of the Company’s employees work under collective work contracts that are subject to annual salary reviews and biannually for other compensations. As of December 31, 2020, and 2019, Grupo TMM has 934 and 1,099 employees, respectively. The significant actuarial assumptions to determine the defined benefits obligation are the discount rate, the salary increase rate, and the average life expectancy. The calculation of the defined benefits obligation is sensitive to these assumptions. The following table summarizes the effects of changes to these actuarial assumptions on the defined benefits obligations at December 31, 2020: 1.0% increase 1.0% decrease Discount rate (Decrease) increase in the defined benefits obligation $ (54 ) $ 6,958 Salary increase rate Increase (decrease) in the defined benefits obligation $ 5,711 $ (678 ) One year Increase One year Decrease Average life expectancies Increase (decrease) in the defined benefits obligation $ 3,426 $ (3,940 ) The present value of the defined benefits obligation and also the defined benefits obligation recognized in the consolidated statement of financial position are calculated using the same method (projected unit credit). The sensitivity analyses are based on a change in one assumption without changing the others. This sensitivity analysis may not be representative of the real variance in the defined benefits obligation, as it is unlikely that the change to the assumptions would occur on its own, as some of the assumptions may be correlated.

Earnings per share

Earnings per share	12 Months Ended
Earnings per share	Dec. 31, 2020
Earnings per share [Abstract]
Earnings per share	24 Earnings per share As of December 31, 2020, 2019 and 2018, earnings per share was determined based on the weighted average number of shares outstanding during the year. There are no potentially dilutive instruments outstanding, therefore basic and diluted earnings per share are the same.

Fair value measurement

Fair value measurement	12 Months Ended
Fair value measurement	Dec. 31, 2020
Fair value measurement [Abstract]
Fair value measurement	25 Fair value measurement Fair value measures for non-financial assets The non-financial assets and liabilities measured at fair value in the statement of financial position are grouped into three levels of fair value hierarchy. The three levels are defined based on the observability of relevant data for the measuring, as follows: • Level 1: quoted prices (without adjustment) in active markets for identical assets and liabilities. • Level 2: data other than the quoted prices included in Level 1 that are observable for the asset and liability, either directly or indirectly; • Level 3: non-observable data for the asset or liability. As of December 31, 2020 and 2019 non-financial assets measured at fair value are classified in Level 3 of this hierarchy, as described below: 2020 2019 Level 3 Vessels $ 182,055 $ 214,938 Buildings 286,232 299,660 Land 1,934,345 1,597,923 $ 2,402,632 $ 2,112,521 As of December 31, 2020, the values of the Company’s land, buildings and facilities were estimated based on appraisals performed by independent, professionally qualified property valuers. As of December 31, 2020, and 2019, the revalued amounts for all the vessels were determined using the revenue technique. The important information and assumptions are prepared in close collaboration with Management. The valuation processes and changes in the fair value are reviewed by the Administration and Finance Department on the financial reporting date. Additional information on fair value measurement is as follows. Vessels (Level 3) The fair values for the offshore vessels, and parcel tankers are estimated based on revenue that capitalizes the estimated revenue cash flows from the leasing of vessels net of operating costs projected, using an appropriate discount rate that reflects the required performance for similar assets. Cash flows are calculated based on the average of international charter rates and operating costs (including maintenance), and also the historical utilization level. The value of vessels is sensitive to changes in these variables. The most significant information, which is not observable, is the value of the estimated daily rates, the assumptions for the percentage of utilization and the discount rate. The fair value increases if the estimated daily rates and the percentage of utilization increase or if the discount rate (market yields) decreases. The appraisals in general are sensitive to these three assumptions. Management believes that the range of reasonably possible alternatives is greater for the value of the rates and the percentage of use, and also that there is a correlation between these factors. The information used for the measurement of fair value as of December 31, 2020 was: Offshore vessels Parcel tankers Daily rate or fee 4,504 usd 15,805 usd Average percentage of utilization 78 % 89 % Discount rate 7.44 % 7.65 % Buildings and land (Level 3) The valuation was prepared based on a market focus that reflects the prices observed on recent market transactions involving similar properties and incorporates adjustments for factors specific to the property in question, including land size, location, liens, and current use. The most significant information used, which is not observable, is the adjustment for factors specific to the properties in question. The magnitude and direction of this adjustment depends on the characteristics of observable market transactions for similar properties used as the end point for the valuation. Although this information is subjective, Management considers that the global valuation will not be materially affected by reasonably possible alternatives. As of December 31, 2020, and 2019, the reconciliation between the carrying amounts of non-financial assets classified within Level 3 is as follows: Vessels Buildings andFacilities Balance as of January 1, 2020 $ 214,938 $ 1,897,583 Amount recognized in other comprehensive income: Revaluation surplus of vessels - 330,571 Amount recognized in statements profit or loss: Loss on revaluation of vessels (16,136 ) - (16,136 ) 330,571 Additions and disposals, net (16,747 ) (7,577 ) Balance as of December 31, 2020 $ 182,055 $ 2,220,577 Balance as of January 1, 2019 $ 782,673 $ 1,385,153 Amount recognized in other comprehensive income: Revaluation surplus of vessels 41,026 377,593 Amount recognized in statements profit or loss: Loss on revaluation of vessels (39,199 ) - 1,827 377,593 Additions and disposals, net (569,562 ) 134,837 Balance as of December 31, 2019 $ 214 ,938 $ 1,897,583 As of December 31, 2020, and 2019, there were no effects from unrealized gains from fair value measurements.

Financial instruments risk

Financial instruments risk	12 Months Ended
Financial instruments risk	Dec. 31, 2020
Financial instruments risk [Abstract]
Financial instruments risk	26 Financial instruments risk Risk management objectives and policies Grupo TMM is exposed to various risks in relation to financial instruments. The Company’s financial assets and liabilities by category are summarized in Note 14. The main types of risks are market risk, credit risk and liquidity risk. The Company’s risk management is coordinated at its headquarters, in close cooperation with the board of directors, and focuses on actively securing short to medium-term cash flows by minimizing the exposure to volatile financial markets. The Company does not actively engage in the trading of financial assets for speculative purposes nor does it write options. The most significant financial risk to which the Company is exposed are described below: Market risk Currency risk The monetary position for Grupo TMM may be materially affected by variances in the exchange rate between the US dollar and the Mexican peso due to the Company’s significant operations in Mexico. The Company does not cover this exposure. Grupo TMM minimizes its exposure effects in foreign currency by contracting financial debt in Mexican pesos. Grupo TMM also faces transactional currency exposure. This exposure derives from sales and acquisitions made in currencies other than Mexican pesos, Grupo TMM’s functional currency. As of December 31, 2020 and 2019, approximately 55% and 45% of Grupo TMM’s sales are denominated in US dollars, respectively while approximately 20% and 25% of the costs and expenses for both years are denominated in US dollars. As of December 31, 2020 and 2019, the Company held monetary assets and liabilities denominated in foreign currencies other than the Mexican peso, translated at the corresponding interbank exchange rate as related to the Mexican peso, as follows: 2020 2019 US dollar Other currencies US dollar Other Assets $ 309,657 $ 932 $ 547,320 $ 1,093 Liabilities (480,253 ) (1,372 ) (1,042,661 ) (1,641 ) $ (170,596 ) $ (440 ) $ (495,341 ) $ (548 ) As of December 31, 2020 and 2019, the exchange rate was Ps19.9352 and Ps18.8727 6 per US dollar, respectively. Sensitivity analysis The following table shows for the years ended December 31, 2020 and 2019, the sensitivity in profit or loss related to the financial assets and liabilities of Grupo TMM and the exchange rate; United States dollar (USD) / peso ‘considering that the rest of the conditions remain the same’, assumes a change of +/- 11.64% for 2020 and +/- 22.10% for 2019 in the peso / USD exchange rate. This percentage was determined based on the volatility of the average exchange rate market over the past 12 months. The sensitivity analysis is based on financial instruments in foreign currency held by Grupo TMM on the reporting date. If the peso had strengthened or weakened against the USD by 11.64% for 2020 and 22.10% for 2019, this would have had the following impact on the monetary position: 2020 2019 11.64% Increase in the exchange rate 11.64% Decrease in the exchange rate 22.10% Increase in the exchange rate 22.10% Decrease in the exchange rate Assets in US dollars $ 36,030 $ (36,030 ) $ 120,944 $ (120,944 ) Assets in other currencies 108 (108 ) 242 (242 ) Liabilities in US dollars (55,880 ) 55,880 (230,401 ) 230,401 Liabilities in other currencies (160 ) 160 (363 ) 363 $ (19,902 ) $ 19,902 $ (109,578 ) $ 109,578 The exposure to exchange rates varies during each year, depending on the volume of overseas operations or in foreign currency; however, the above analysis is considered representative of Grupo TMM’s exposure to currency risk. Interest rate risks Grupo TMM’s exposure to the risk of changes in market interest rates is related principally to the long-term debt obligations of Grupo TMM at a variable interest rate. Grupo TMM’s policy is to obtain fixed rated instruments on its loans and, when a loan has a variable interest rate, the Company’s policy is to obtain all needed derivative financial instruments in order to fix this rate. At December 31, 2020 and 2019, the Company has $129.8 and $50.2 million pesos of debt contracted on fixed and variable rates, respectively. At December 31, 2020 and 2019, the debt contracted on fixed and variable rates was $103.0 and $159.1 million pesos, respectively. Sensitivity analysis The following table illustrates the sensitivity in profit or loss at December 31, 2020 and 2019 to a reasonably possible change in the interest rates of +/- 8.24% and +/- 7.05%, respectively. These changes are considered to be reasonably possible based on the current market conditions. The calculations are based on a variance in the average market interest rate for each period and the financial instruments on the reporting date that are sensitive to variances in the interest rates. The rest of the variables remain constant. 2020 2019 +8.24% Variance -8.24% Variance +7.05% Variance -7.05% Variance Profit or loss for the year $ (1,140 ) $ 1,140 $ (1,698 ) $ 1,698 The impact shown in the above sensitivity is considered the same both in the results of profit or loss and in stockholders’ equity. Concentration of risk For the year ended December 31, 2020, the Company obtained revenues from TMM DM (related party), Celanse Operations Mexico and Helmsley Management, representing 14%, 13% and 7%, respectively. None of the remaining customers represent more than 4% of its total revenues. For the year ended December 31, 2019, the Company obtained revenues from TMM DM (related party), Helmsley Management and Celanese Operations Mexico, representing 17%, 11%, and 7%, respectively. None of the remaining customers represents more than 4% of the total revenues. Credit risk Credit risk is managed on a group basis, based on the credit risk management policies and procedures of Company. Credit risk with respect to cash balances maintained in banks and sight deposits is managed through diversification of bank deposits that are only made with high credited financial institutions. For other receivables, other than trade accounts receivable and contractual assets, the balances are considered immaterial and whose risk of default is null. The Company continuously monitors the creditworthiness of customers, based on its experience and customer profiles defined by Management. The Company’s policy is to deal only with creditworthy counterparties. Credit terms range between 30 and 90 days. Credit terms negotiated with customers are subject to an internal approval process that considers the experience and profile of the customer. Current credit risk is managed by a periodic review of the accounts receivable aging analysis, together with credit limits per customer. Trade accounts receivable consist of a large number of customers in various industries and geographical areas. Guarantees (collateral) The Company does not maintain any guarantee on its trade accounts receivable. In addition, the Company does not have guarantees related to other financial assets (i.e., other receivables, cash and cash equivalents held in banks). Trade accounts receivable Grupo TMM applies the IFRS 9 simplified model of recognizing lifetime expected credit losses for all trade receivables as these items do not have a significant financing component. In measuring the expected credit losses, the trade receivables have been assessed on a collective basis as they possess shared credit risk characteristics. They have been grouped based on the days past due and also according to the geographical location of customers. Expected credit loss rates are based on the sales payment profile over the last 48 months prior to December 2020 and 2019, respectively, as well as the corresponding historical credit losses during that period. Historical rates are adjusted to reflect current and future macroeconomic factors that affect the customer’s ability to liquidate the unpaid balance. Trade receivables are written off (i.e. derecognized) when there is no reasonable expectation of recovery. Failure to make payments within 180 days from the invoice date and failure to engage with the Company on alternative payment arrangement amongst other is considered indicators of no reasonable expectation of recovery. However, industry and client’s practices could generate balances with more than 180 days of aging, for which conclusion is that those balances will be collected. Pursuant to the foregoing, the expected credit loss for trade accounts receivable as of December 31, 2020 and 2019 was determined as follows: Trade accounts receivable days in arrears Current More than 30 days More than 60 days More than Total As of December 31, 2020 Expected credit loss rate 0.0 % 0.0 % 0.0 % 32.7 % - Gross carrying value $ 77,030 $ 5,875 $ 4,290 $ 64,841 $ 152,036 Expected credit losses during the lifetime 21,218 21,218 As of December 31, 2019 Expected credit loss rate 0.0 % 0.0 % 2.3 % 27.4 % - Gross carrying value $ 214,850 $ 18,398 $ 7,976 $ 51,748 $ 292,972 Expected credit losses during the lifetime 185 14,200 14,385 Liquidity risk The goal of Grupo TMM is to maintain a balance between the continuity of loans and flexibility through the use of bank loans and securitizations. As of December 31, 2020, and 2019, only 35% and 24%, respectively, of Grupo TMM’s financial liabilities are due within the next 12 months. As of December 31, 2020, and 2019, the financial liabilities of Grupo TMM have contractual maturities (including interest payments as applicable) are summarized as follows: Current Non-Current In 6 months 6 to 12 Months 1 to 4 years More than 4 Years At December 31, 2020 Trade payables $ 228,959 $ - $ - $ - Accounts payable and accrued expenses - 525,108 23,522 - Leasing liabilities 29,465 28,780 193,811 103,457 Financial debt 52,125 76,960 48,227 5,417 $ 310,549 $ 630,848 $ 265,560 $ 108,874 Current Non-Current In 6 months 6 to 12 Months 1 to 4 years More than 4 Years At December 31, 2019 Trade payables $ - $ 262,159 $ - $ - Accounts payable and accrued expenses - 499,529 46,742 - Leasing liabilities 34,908 25,670 130,238 396,543 Financial debt 55,139 84,050 113,288 5,449 $ 90,047 $ 871,408 $ 290,268 $ 401,992 The above amounts reflect the contractual cash flows without discount, which may differ from the values registered in the liabilities on the reporting date.

Capital management policies and

Capital management policies and procedures	12 Months Ended
Capital management policies and procedures	Dec. 31, 2020
Capital management policies and procedures [Abstract]
Capital management policies and procedures	27 Capital management policies and procedures Grupo TMM’s capital management goal is to ensure the capacity of Grupo TMM to continue as a going concern and to provide its stockholders with an appropriate return on their investment. The Company monitors capital based on the carrying value plus its financial debt. The Company sets its capital amount proportionate to its overall financing structure, meaning, the capital and financial liabilities that are not loans. Grupo TMM manages the capital structure and makes adjustments in light of changes in the economic conditions and the associated risks of the underlying assets. In order to maintain or adjust the capital structure, Grupo TMM may adjust the amount of capital reimbursements to stockholders, or issue new shares or sell assets to reduce its financial debt. As of December 31, 2020, and 2019, the capital management is summarized as follows: 2020 2019 Stockholders’ equity $ 2,247,408 $ 2,422,792 Cash and cash equivalents (142,982 ) (512,799 ) Stockholders’ equity, net $ 2,104,426 $ 1,909,993 Total financial debt $ 182,729 $ 257,926 Leasing liabilities 355,513 587,359 Overall financing $ 538,242 $ 845,285 Capital-to-overall financing ratio 3.91 2.26

Commitments and contingencies

Commitments and contingencies	12 Months Ended
Commitments and contingencies	Dec. 31, 2020
Commitments and contingencies [Abstract]
Commitments and contingencies	28 Commitments and contingencies Commitments a) Concession fees Pursuant to the concession to operate the cruise and automobile terminal in the Port of Acapulco, Guerrero, the Company must make fixed and variable monthly payments. These payments totaled $7,507 and $7,536, in the years of 2020 and 2019, respectively. a) RPS Claim On August 7, 2007, Transportación Marítima Mexicana, S.A. de C.V. (‘TMM’) filed a claim for arbitration against Refined Product Services (“RPS”) for US$50 thousand, for various expenses incurred by TMM due to the delay of the re-delivery of the tanker vessel Palenque. On October 19, 2007, RPS filed a countersuit for US$3.0 million, for alleged faults and lack of maintenance involving the tanker vessel Palenque, and also consequential damages for having lost a contract while the vessel was being repaired. The consolidated financial statements did not present any significant claims for payments of loss (RPS) during 2019, 2020 and up to the authorization date hereof. The Company’s Management and its legal advisors consider the position against this countersuit is strong, as there are sufficient elements and arguments for defense, also the amount claimed by RPS would appear to be excessive and for non-supported issues. b) Mutual loans between WWS y TMM In December 2007, TMM and Worldwide Services, Ltd. (“WWS”) filed mutual claims; TMM for $394 thousand dollars, claiming fuel and low return on the performance of the tanker ship Veracruz A, and WWS in the amount of $938 thousand dollars, primarily claiming a presumed over-performance of the same ship. As of the date of the authorization of the consolidated financial statements, total claims against TMM amount to $2.4 million dollars. However, those claims are considered weak. TMM filed an appeal to have the case dismissed, claiming that the Court has no jurisdiction since the arbitration proceedings were initiated with the wrong plaintiff’s name. In January 2017, a ‘partial award’ was issued in which the dismissal of the case was not granted. WWS presented a ‘claim submission’ discounting certain claims, to which TMM responded, requesting a “security of costs” from WWS; same that WWS never presented. Therefore, on March 2, 2021 TMM was notified of the award by which the court dismissed the case. This matter is closed. c) Tax liabilities determined on TMM Suit filed by TMM against the rulings handed down on which various tax liabilities were determined for presumed omitted income tax, corresponding to tax year 2005. On November 5, 2012, the appeal for annulment was allowed to proceed before the former Federal Court of Tax and Administrative Justice. That appeal for annulment was forwarded for study and resolution to the Metropolitan Regional First Division of the Federal Court of Tax and Administrative Justice. On January 30, 2018, TMM was notified of the decision whereby the matter was forwarded to the Full Federal Tax Court of Administrative Justice sitting in Mexico City, and in February 2020, a favorable judgment was issued for the interests of the Company. d) Motions for Annulment against various tax provisions During 2017 and 2016, Grupo TMM filed Motions for Annulment with the Federal Court of Administrative Justice against various decisions of the Tax Administration Service (SAT), on the rejection of deductions (tax year 2007), modifications to the Consolidation Regime for controlled companies (tax year 2005), deferred income tax on consolidation (tax year 2010), and the termination of the consolidation regime (tax year 2013), on which rulings have not been handed down by the courts with competent jurisdiction. Grupo TMM believes its legal position is strong and a ruling favorable to the interests of the Company is expected. e) Other legal proceedings The Company is party to various other legal proceedings and administrative actions, all of which are of an ordinary or routine nature and incidental to its operations. Although it is impossible to predict the outcome of any legal proceeding, in the opinion of the Company’s management, such proceedings and actions should not, individually or in the aggregate, have a material adverse effect on the Company’s financial condition, results of operations or liquidity. f) Operations with related parties Under the Income Tax Law, companies that conduct operations with related parties, nationals or nonresidents, are subject to fiscal limitations and obligations regarding the determination of the prices negotiated, as these must be comparable to those that would be used with or between independent parties on similar operations. In the event the tax authorities were to review the prices and reject the amounts determined, they may demand, an addition to the taxes and accessory charges corresponding (adjustments and surcharges), fines on omitted taxes, which could be for up to 100% of the adjusted tax amount. The Company has significant transactions and relations with related parties, for which the Company holds documentation that confirms the terms of these transactions were conducted in 2020 similarly to transactions between unrelated parties. The Company and its subsidiaries are in the process of completing this study for 2020. g) Other legislation Grupo TMM and Subsidiaries are subject to the laws and ordinances of other countries, as well as international regulations governing maritime transportation and the observance of safety and environmental regulations.

Subsequent events to the report

Subsequent events to the reporting date	12 Months Ended
Subsequent events to the reporting date	Dec. 31, 2020
Subsequent events to the reporting date [Abstract]
Subsequent events to the reporting date	29 Subsequent events to the reporting date (a) On January 8, 2021, the sale of the ship “Olmeca” was formalized by Transportación Marítima Mexicana, S.A. de C.V., a subsidiary of Grupo TMM which was delivered in Singapore to the Athene Shipping Limited company, generating a profit. On December 2, 2020, the Company received an advance to guarantee the purchase for an amount of $63,700. This amount was used to settle the debt owed to ACT Maritime, LLC. (b) Management continues to monitor the development of the COVID-19 pandemic and its impact on the Company, and has not identified any significant event related to the pandemic or any other matter between the reporting date and the authorization date of the accompanying financial statements, which in its view requires any adjustment or disclosure.

Authorization of the consolidat

Authorization of the consolidated financial statements	12 Months Ended
Authorization of the consolidated financial statements	Dec. 31, 2020
Authorization of the consolidated financial statements [Abstract]
Authorization of the consolidated financial statements	30 Authorization of the consolidated financial statements The consolidated financial statements of the Company were authorized by Luis Rodolfo Capitanachi Dagdug on May 14, 2021, in his capacity as Director of Administration and Finance, as well as by the Board of Directors on the same date, to be issued and subsequently approved by the General Stockholders’ Meeting, which has the authority to modify the accompanying consolidated financial statements.

Summary of significant accoun_2

Summary of significant accounting policies (Policies)	12 Months Ended
Summary of significant accounting policies (Policies)	Dec. 31, 2020
Summary of significant accounting policies [Abstract]
Basis of preparation	4.1 Basis of preparation The Company’s financial statements have been prepared on an accrual basis and under the historical cost convention except for the revaluation of vessels and properties. Monetary amounts are expressed in Mexican pesos and are rounded to the nearest thousands, except for earnings per share.
Basis of consolidation	4.2 Basis of consolidation The consolidated financial statements include the accounts of Grupo TMM and those of its subsidiaries. Grupo TMM controls a subsidiary when it is exposed, or has rights, to variable returns resulting from its involvement with the subsidiary and has the ability to affect those returns through its power over the subsidiary. All subsidiaries have the reporting date of “December 31”, for all years reported. The balances and transactions among subsidiaries have been eliminated for the purposes of consolidation, including balances and unrealized gains on transactions between Grupo TMM’s companies. Unrealized losses on the sale of assets among the Company are eliminated in the consolidation and the asset involved is also reviewed for impairment from a group perspective. Accounting policies of subsidiaries have been adjusted where necessary to ensure consistency with the policies adopted by Grupo TMM. Profit or loss and other comprehensive income of subsidiaries acquired or disposed during the year are recognized from the effective date of acquisition, or up to the effective date of disposal, as applicable. Non-controlling interest, presented as part of the stockholders’ equity, represents the portion of the subsidiary’s profit or loss and net assets that are not held by Grupo TMM. The Company attributes the total comprehensive income or loss of the subsidiaries between the owners of the parent and the non-controlling interest based on their respective ownership interests. Associates and joint ventures Associates are all entities over which Grupo TMM has significant influence but not control. A joint venture is a joint arrangement whereby the parties that have joint control of the arrangement having rights to the net assets of the arrangement. Investments in associates and joint ventures are accounted by the equity method and are initially recognized at their acquisition cost. The carrying amount of investments in associates and joint ventures is increased or decreased to recognize Grupo TMM’s share of the profit or loss and other comprehensive income of the associate and joint venture, adjusted where necessary to ensure consistency with the accounting policies of the Company. Unrealized gains on transactions between Grupo TMM and its associates and joint ventures are eliminated to the extent of the Company’s interest on those entities. When unrealized losses are eliminated, the asset involved is also tested for impairment.
Business combinations	4.3 Business combinations Grupo TMM applies the acquisition method to accounting for business combinations. The consideration transferred by Grupo TMM to obtain control of a subsidiary is calculated as the sum of the fair values on the acquisition-date of the assets transferred, liabilities incurred, and the equity interests issued by Grupo TMM, which includes, accordingly, the fair value of any asset or liability that arises from the contingent consideration arrangement. Acquisition costs are expensed as incurred. Grupo TMM recognizes identifiable assets acquired and liabilities assumed in the business combination independent of whether these were recognized in acquirer’s financial statements prior to the acquisition. Assets acquired and liabilities assumed are generally measured at their acquisition-date fair value. Goodwill is stated after the individual recognition of identifiable intangible assets. It is calculated as the excess of the sum of : a) the fair value of the consideration transferred, b) the amount recognized for any non-controlling interest in the entity acquired, and c) the fair value on the acquisition date of any equity interest in the acquire, over the acquisition-date the fair values of the identifiable net assets. If the fair values of the identifiable net assets exceed the sum calculated above, this excess amount (e.g. gain on a bargain purchase) is immediately recognized in profit or loss.
Foreign currency translation	4.4 Foreign currency translation Functional and presentation currency The consolidated financial statements are reported in Mexican pesos, which is also the functional currency of Grupo TMM. Foreign currency balances and transactions Foreign currency transactions are translated into the functional currency of the respective Company entity, using the exchange rates prevailing at the dates of the transactions (spot exchange rate). Foreign exchange gains and losses resulting from the settlement of such transactions and from the measurement of monetary items denominated in foreign currency at year-end exchange rates are recognized in profit or loss. Non-monetary items are not retranslated at year-end and are measured at historical cost (translated using the exchange rates at the transaction date), except for non-monetary items measured at fair value which are translated using the exchange rates at the date when fair value was determined.
Cash and cash equivalents	4.5 Cash and cash equivalents Cash and cash equivalents comprise cash on hand and demand deposits, together with other highly liquid and short-term investments that are readily convertible into known amounts of cash and which are subject to insignificant risk of change in their value.
Materials and supplies	4.6 Materials and supplies Materials and supplies, consisting mainly of fuel and items for the maintenance of property, vessels and equipment, are valued at the lower of the average cost and the net realizable value.
Prepayments	4.7 Prepayments Represent prepayments for services that will be received in the future and are amortized in the period when said services are received.
Property, vessels and equipment	4.8 Property, vessels and equipment Properties and vessels The properties (land and buildings) are measured at fair value, which are determined by external professional valuers every three years or before if the market factors indicate a significant change in the fair value. The last valuation of these assets was in December 2019. The vessels are measured at fair value and as of December 31, 2020 and 2019, the revalued amounts were determined using the revenue technique (expected future cash flows). The frequency of the revaluations for this class of assets will be based on the changes of the fair values, meaning when these values significantly differ from their carrying value. The Company has revaluated this class of assets as of December 31, 2020 and 2019. The revaluation surplus that is derived from the valuation of properties and vessels is recognized as part of ‘Other comprehensive income items’ and forms part of ‘other capital components’ in stockholders’ investment. A revaluation surplus is credited to income up to an amount equivalent to any revaluation write-down or impairment loss previously recognized income. Any excess is recognized in ‘Other comprehensive income items’ and in stockholders’ equity in the item of ‘Revaluation surplus’. Revaluation write-downs or impairment losses are recognized in ‘Other comprehensive income items’ up to the amount previously recognized on that asset in stockholders’ equity in the item of ‘Revaluation surplus’. Any remaining decrease is recognized in income for the year. Any remaining balance of the revaluation surplus in stockholders’ equity at the time of disposing of the asset that gave rise thereto is reclassified to retained earnings. Moreover, any remaining balance of the revaluation surplus in stockholders’ equity may not be distributed to stockholders. The depreciation of properties and vessels is recognized using the straight-line method to write down its carrying value less its estimated residual value. As no finite useful life for land can be determined, the related carrying amounts are not depreciated. Equipment Equipment is stated at construction or acquisition cost, including any cost directly attributable to bringing the assets to the location and condition necessary for them to be capable of operating in the manner intended by Grupo TMM’s Management. Acquisitions through capital leases or charter arrangements with an obligation to purchase are capitalized based on the present value of future minimum payments, recognizing the related liability. Depreciation of equipment is computed using the straight-line method based on the useful lives of the assets net of the estimated residual value. Recurring maintenance and repair expenditures are charged to operating expenses as incurred. Major repairs to vessels (docks) are capitalized and amortized over the period in which benefits are expected to be received (two to five years for vessels). The material residual values and the estimated useful life are adjusted as necessary, at least once a year. Gains or losses from the disposal of property, vessels and equipment are determined as differences between the disposal proceeds and the carrying amount of the assets and are recognized in profit or loss as part of ‘Other (expenses) income’, accordingly (see Note 19). Construction in progress Disbursements attributable to construction of assets that are identifiable and may be controlled by the Company are recognized as assets when they meet the following conditions: • it is technically possible to complete the construction of the asset so that it can be available to be used; • management has the intent of completing the asset to use it; • it can be proven that the asset will generate economic benefits in the future; • adequate technical, financial or another type of resources are available to complete the asset; and • the disbursement attributable to the asset during its construction can be determined reliably.
Leased assets	4.9 Leased assets The Company as lessee The Company makes the use of leasing arrangements principally of warehouse, courtyards, corporate building and cranes. The rental contracts for facilities are typically negotiated for terms of between 1 and 9 years and some of these have extension terms. Lease terms for cranes have lease terms of between 1 and 2 years without any extension terms. The Company does not enter into sale and leaseback arrangements. All the leases are negotiated on an individual basis and contain a wide variety of different terms and conditions. The Company assesses whether a contract is or contains a lease at inception of the contract. A lease conveys the right to direct the use and obtain substantially all of the economic benefits of an identified asset for a period of time in exchange for consideration. Some lease contracts contain both lease and non-lease components. These non-lease components are usually associated with facilities management services. The Company has elected to separate their lease and non-lease components based on their relative stand-alone prices. Measurement and recognition of leases as a lessee At lease commencement date, the Company recognizes a right-of-use asset and a lease liability in its consolidated statement of financial position. The right-of-use asset is measured at cost, which is made up of the initial measurement of the lease liability. The Company depreciates the right-of-use asset on a straight-line basis from the lease commencement date to the earlier of the end of the useful life of the right-of-use asset or the end of the lease term. The Company also assesses the right-of-use asset for impairment when such indicators exist. At the commencement date, the Company measures the lease liability at the present value of the lease payments unpaid at that date, discounted using the Company’s incremental borrowing rate on the date of the revaluation when the implicit lease rate cannot be easily determined. Lease payments included in the measurement of the lease liability are made up of fixed payments and variable payments based on an index or rate. Subsequent to initial measurement, the liability will be reduced by lease payments that are allocated between repayments of principal and finance costs. The finance cost is the amount that produces a constant periodic rate of interest on the remaining balance of the lease liability. The lease liability is reassessed when there is a change in the lease payments. Changes in lease payments arising from a change in the lease term. The revised lease payments are discounted using the Company’s incremental borrowing rate at the date of reassessment when the rate implicit in the lease cannot be readily determined. The amount of the remeasurement of the lease liability is reflected as an adjustment to the carrying amount of the right-of-use asset. Payments under leases can also change when change through an index or a rate used to determine those payments. The lease liability is remeasured only when the adjustment to lease payments takes effect and the revised contractual payments for the remainder of the lease term are discounted using an unchanged discount rate. The remeasurement of the lease liability is dealt with by a reduction in the carrying amount of the right-of-use asset to reflect the full or partial termination of the lease for lease modifications that reduce the scope of the lease. Any gain or loss relating to the partial or full termination of the lease is recognized in profit or loss. The right-of-use asset is adjusted for all other lease modifications. The Company has elected to account for short-term leases and leases of low-value assets using the practical expedients. Instead of recognizing a right-of-use asset and lease liability, the payments in relation to these are recognized as an expense in profit or loss on a straight-line basis over the lease term. The Company as lessor As a lessor the Company classifies its leases as either operating or finance leases. A lease is classified as a finance lease if it transfers substantially all the risks and rewards incidental to ownership of the underlying asset and classified as an operating lease if it does not.
Intangible assets	4.10 Intangible assets Recognition of intangible assets Concession rights Concession rights correspond to payments made for the rights to operate assets under concession, which are stated at cost and are amortized over the terms specified in the corresponding agreements. Software Software licenses acquired are capitalized on the basis of costs incurred to acquire and install the specific software. Trademark The trademark acquired in a business combination that qualifies for separate recognition is considered an intangible asset and is recorded at its fair value. Subsequent measuring All finite-lived intangible assets are accounted for using the cost model by which the net capitalized costs of their residual value are amortized using the straight-line method throughout their estimated useful lives, in the case of the concession rights; these are amortized according to the term specified in the corresponding agreement. The residual values and useful lives are reviewed at each reporting date. The trademark is considered an intangible asset with an indefinite life; therefore, it is subject to impairment tests annually as described in Note 13. The amortization is included in the consolidated statement of operations as part of the depreciation, amortization, and loss on revaluation item. Subsequent expenditures to preserve software and trademarks are expensed as incurred.
Impairment testing of long-lived assets	4.11 Impairment testing of long-lived assets For impairment assessment purposes, assets are grouped at the lowest levels for which there are largely independent cash inflows (cash-generating units). As a result, some assets are tested individually for impairment and some are tested at cash-generating unit level. Trademark is allocated to those cash-generating units that are expected to benefit from synergies of a related business combination and represent the lowest level within the Company at which management monitors the trademark. Cash-generating units to which trademark has been allocated (determined by the Grupo TMM’s Management as equivalent to its operating segments) are tested for impairment at least annually. All other individual assets or cash-generating units are tested for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. An impairment loss is recognized for the amount by which the asset’s (or cash-generating unit’s) carrying amount exceeds its recoverable amount, which is the higher of fair value less costs of disposal and value-in-use. To determine the value-in-use, management estimates expected future cash flows from each cash-generating unit and determines a suitable discount rate in order to calculate the present value of those cash flows. The data used for impairment testing procedures are directly linked to the Grupo TMM’s latest approved budget, adjusted as necessary to exclude the effects of future reorganizations and asset enhancements. Discount factors are determined individually for each cash-generating unit and reflect current market assessments of the time value of money and asset-specific risk factors. Impairment losses for cash-generating units reduce first the carrying amount of any goodwill allocated to that cash-generating unit. Any remaining impairment loss is charged pro rata to the other assets in the cash-generating unit.
Financial instruments	4.12 Financial instruments Recognition and derecognition Financial assets and financial liabilities are recognized when the Company becomes a party to the contractual provisions of the financial instrument. Financial assets are derecognized when the contractual rights to the cash flow from a financial asset expire, or when the financial asset and all the substantial risks and benefits have been transferred. A financial liability is derecognized as extinguished, discharged, canceled, or expired. Classification and initial measurement of financial assets Except for those trade receivables that do not contain a significant financing component and are measured at the transaction price in accordance with IFRS 15, all financial assets are initially measured at fair value, adjusted by transaction costs (where applicable). Financial assets are classified into the following categories: • amortized cost • fair value through profit or loss (FVTPL) • fair value through other comprehensive income (FVOCI). In the periods presented the Company does not have any financial assets categorized as FVTPL or FVOCI. The classification is determined by both: • the Company’s business model for managing the financial asset; and • the contractual cash flow characteristics of the financial asset. All income and expenses relating to financial assets that are recognized in profit or loss are presented within financial costs and income; except for impairment of trade receivables which is presented in the heading of ‘Other costs and expenses’. Subsequent measurement of financial assets Financial assets at amortized cost Financial assets are measured at amortized cost if the assets meet the following conditions: • they are held within a business model whose objective is to hold the financial assets and collect its contractual cash flows; and • the contractual terms of the financial assets give rise to cash flows that are solely payments of principal and interest on the principal amount outstanding. After initial recognition, these are measured at amortized cost using the effective interest method. The financial assets of the Company are not discounted since it is not material. The Company’s cash and cash equivalents, trade receivables and part of the other accounts receivable fall into this category of financial instruments. Impairment of financial assets IFRS 9’s impairment requirements use more forward-looking information to recognize expected credit losses – the ‘expected credit loss (ECL) model’. Instruments within the scope of the new requirements included mainly trade receivables, contract assets recognized and measured under IFRS 15, other accounts receivables and accounts receivable from related parties. Recognition of credit losses considers a broader range of information when assessing credit risk and measuring expected credit losses, including past events, current conditions, reasonable and supportable forecasts that affect the expected collectability of the future cash flows of the instrument. Grupo TMM makes use of a simplified approach in accounting for trade and other accounts receivables as well as contract assets and records the loss allowance as lifetime expected credit losses. These are the expected shortfalls in contractual cash flows, considering the potential for default at any point during the life of the financial instrument. In calculating, the Company uses its historical experience, external indicators and forward-looking information to calculate the expected credit losses using a provision matrix. The Company assess impairment of trade receivables based on the characteristics of the business segment, when appropriate this assessment is made on a collective basis as they possess shared credit risk characteristics, they have been grouped based on the days past due. Refer to Note 26, for a detailed analysis of how the impairment requirements of IFRS 9 are applied. Classification and measurement of financial liabilities The Company’s financial liabilities include borrowings, trade and other payables. Financial liabilities are initially measured at fair value, and, where applicable, adjusted for transaction costs. Subsequently, financial liabilities are measured at amortized cost using the effective interest method. All interest-related charges are included within finance costs or finance income.
Provisions, contingent liabilities and contingent assets	4.13 Provisions, contingent liabilities and contingent assets Provisions are recognized when the present obligations resulting from a past event will probably lead to an outflow of the Company economic resources and the amounts can be reliably estimated. Timing or amount of the outflow may still be uncertain. A present obligation arises from a presence of a legal or constructive commitment that has resulted from past events. Provisions are not recognized for future operating losses. Provisions are the estimated amounts required to be expended to settle the present obligation based on the most reliable evidence available at the date of the consolidated financial statements, including the risks and uncertainties associated with the present obligation. Provisions are discounted at their present value, where the time value of money is material. All provisions are reviewed on the issuance of the financial statements and adjusted to reflect the current best estimate. When an outflow of economic resources for present obligations is not probable, this is not recognized as a liability, unless it was assumed in the course of a business combination. Such cases are disclosed as contingent liabilities unless the outflow of resources is remote. Possible inflows of the Company’s economic benefits, which do not yet meet the criteria for recognition of an asset, are considered as contingent assets.
Taxes on earnings	4.14 Taxes on earnings Calculation of current income tax is based on tax rates and tax laws that have been enacted or substantially enacted to the reporting date of the consolidated financial statements. Deferred income tax is determined using the liability method, based on temporary differences arising between the tax basis of assets and liabilities and their carrying amounts in the financial statements. Determination of deferred income tax has considered tax rates that will be effective at the time of reversion of the temporary differences. The income tax expense in the statement of profit or loss includes the sum of the deferred tax, which has not been recognized in other comprehensive income or directly in stockholders’ equity, and the current income tax for the year. Deferred tax assets are recognized to the extent that it is probable that future taxable profit against which temporary differences can be utilized will be available (see Note 21). This is assessed based on the Company’s forecast of future operating results, adjusted for significant items that are reconciled for the taxable income and the limits on the use of tax losses and other tax asset carryforwards. Deferred income tax is provided on temporary differences arising on investments in subsidiaries and associates, except where the timing of the reversal of the temporary difference can be controlled and it is probable that the temporary difference will not reverse in the foreseeable future.
Statutory employee profit sharing	4.15 Statutory employee profit sharing The statutory employee profit sharing is determined applying the rate of 10% on taxable income, adjusted as provided for by the Income Tax Law. The statutory employee profit sharing accrued is considered an ordinary expense associated with employee benefits.
Post-employment benefits and benefits for short-term employees	4.16 Post-employment benefits and benefits for short-term employees Post-employment benefits Defined benefit plans The seniority pension to which employees are entitled after 15 years of service and after having retired at the age of 60, are expensed in the years in which the services are rendered (see Note 23). In addition, the Company has pension plans for certain employees who retire after the age of 65 (or early retirement at 60 or 55), in addition to having completed a minimum 15 years of service, which are expensed in the years in which the services are rendered (see Note 23). Under the defined benefits plan, the pension amount an employee will receive upon retirement is determined in reference to the time of service and salary determined for each case based on the plan. The legal obligation of the benefits lies with Grupo TMM, even if the plan’s assets to finance the defined benefits plan are separate. The plan’s assets may include assets specifically designated in a long-term benefit fund. The liability recognized in the consolidated statement of financial position for the defined benefits plans is the present value of the defined benefits obligation (DBO) as of the reporting date less the fair value of the plan assets. Management estimates the DBO annually with the assistance of independent actuaries, based on the standard inflation rate, the salary growth rates, and the mortality rate. The discount factors are determined near the close of each year in reference to the high-quality corporate bonds that are denominated in the currency in which the benefits will be paid and which have maturities similar to the terms of the corresponding pension liability. The net cost for the defined benefits liability period is included in the item ‘Salaries, wages and employee benefits’ in the consolidated statements of profit or loss. Indemnifications Indemnifications that are not substitutive of retirement, paid to personnel who leave the company due to restructuring or any other reason, are charged to the operations for the period when incurred or provisions are created when there is a present obligation of these events, with a probability of an outflow of resources and this obligation can be reasonably estimated. Short-term employee benefits Short-term employee benefits, including vacation entitlement, are current liabilities included in ‘Accounts payable and accrued expenses’, measured at the amount Grupo TMM expects to pay as a result of time not taken; as these liabilities are short-term, they were not discounted as their effect is considered immaterial.
Stockholders' equity	4.17 Stockholders’ equity Common shares are classified as equity. Grupo TMM does not have other equity instruments in addition to its common shares. Incremental costs directly attributable to the issue of new shares or options are shown in equity as a deduction, net of taxes, from the proceeds. Incremental costs directly attributable to the issue of new shares or options are included in the cost of acquisition as part of the purchase consideration. The accumulated losses include the profit (loss) for the year and previous periods. Other components of equity capital include: • revaluation surplus, including gains and losses from the revaluation of vessels and properties; • statutory reserve corresponds to the separation of earnings withheld for this reserve; • additional paid-in capital is equivalent to the amount received in excess of the par value of the shares; • translation result represents the cumulative effect of the change in functional currency in previous years; and • actuarial gains and losses include experience adjustments (the effects of differences between the previous actuarial assumptions and what has actually occurred); and the effects of changes in actuarial assumptions.
Recognition of revenue, costs and expenses, and financing costs	4.18 Recognition of revenue, costs and expenses, and financing costs Revenues Company’s revenue arises mainly from services of maritime transportation, logistics and warehousing. To determine whether to recognize revenue, the Company follows a 5-step process: 1. Identifying the contract with a customer 2. Identifying the performance obligations 3. Determining the transaction price 4. Allocating the transaction price to the performance obligations 5. Recognizing revenue when/as performance obligation(s) are satisfied. The Company does not carry out transactions that involve different contracts and on which their characteristics must be combined in accordance with IFRS. Moreover, transactions are not usually carried out that involve different services as part of the same contract; therefore, the total price of the transaction for a contract in all cases is allocated to a single performance obligation, based on their relative independent sales prices. The transaction price for contracts does not consider variable payments, except for certain service payments that are not considered significant in connection with the total revenues of the Company, nor are payments in kind, nor amounts collected on behalf of third parties and nor contemplate a financing component. All revenues are recognized over time, as the Company meets performance obligations by transferring the services promised to its customers. When the Company meets a performance obligation before receiving the payment, the Company already recognizes either a contract asset or a receivable in its consolidated statement of financial position, depending upon if something else is required than only passage of time before the consideration becomes due. The Company generally does not receive payments in advance in connection with performance obligations; therefore, contractual liabilities are not required to be recognized. In obtaining these contracts, the Company incurs immaterial incremental costs. Since the amortization period of these costs would be less than one year, if capitalized, and also that those costs are immaterial, the Company makes use of the practical expedient in IFRS 15.94 and expenses them as they incur. Parcel vessels and bulk carriers These revenues are derived from the transportation of merchandise through the Company’s own shipments or third parties, usually in periods ranging between 7 and 30 days. The rate is fixed and it is set at the beginning of the contract, based on the space or capacity required by the customer. The performance obligation is met as the merchandise is transported from the point of origin to the destination. Revenues are recognized over time on a straight-line basis during the term of each contract. Given that the costs required for rendering the service under these contracts do not vary significantly, that method provides a reasonable representation of the services transferred. The amounts that remain unbilled at the end of the reporting period are presented in the consolidated statement of financial position as contractual assets, since something additional is required in addition to time elapsed in order for those amounts to become due and payable. The Company generally does not receive advances that exceed the amount of obligations met; therefore, contract liability balances are not generated. Maritime administration services They correspond to revenues for services rendered for contracting, operating, and managing shipments, mainly offshore service providers. The rate for these services is determined by applying a 2.85% profit margin to the costs incurred by the Company for rendering services. This percentage is reviewed annually, and it can be increased under certain circumstances, but by applying it beginning the year subsequent to its modification, these services are considered a single performance obligation. Accordingly, the consideration is totally allocated; revenues are recognized over time as the related costs are incurred by applying the corresponding profit margin. The amounts are billed monthly, in accordance with these referred to above; therefore, neither asset balances nor contract liabilities are generally generated. Ship repair services (shipyard) and containers They correspond to revenues for minor and major repairs and maintenance to ships made at the facilities of the Company (shipyard), as well as containers of shipping companies and others such as wharfage. The consideration for the services is fixed, and it is determined in the contract based on the work ordered, including materials and replacement parts, which must be realized in an estimated period for the work, which ranges from 2 days up to 60 days for ships, and from 1 day up to 6 days for containers. Wharfage depends on the considerations of the ship from 1 to 365 days, due to the high degree of interdependence among the various elements of these services. They are recorded in the accounting as a single performance obligation. These revenues are recognized over time in conformity with the completion of the services agreed upon. The Company measures its completion toward total compliance of the performance obligation by comparing real hours invested up to the date with the total estimated hours required to perform the repair or maintenance, including related costs. This base reasonably represents services transferred to each customer, by virtue of the ability of the Company to make reliable estimates based on its significant historical experience in rendering these services. The amounts that remain unbilled at the end of the reporting period are presented in the consolidated statement of financial position as contractual assets, since something additional is required in addition to time passaged in order for those amounts to become due and payable. The Company generally does not receive advances that exceed the amount of obligations met; therefore, liabilities balances are not generated. Other services The Company obtains revenues for other services such as tugboats, suppliers, negotiations, port formalities, among other things. Most of these services are considered single performance obligations in the terms of the respective contracts, and the consideration is entirely allocated to those performance obligations. Revenues are recognized over time, since customers receive and consume the benefits as the Company renders the services, that is, as the performance obligations are met. The Company does not generate asset balances or contract liabilities for most of these services. The Company acts as an agent for the specific case of agency services and, therefore, it recognizes the revenues corresponding to the profit margin generated net of the costs incurred. Costs and expenses The costs and expenses for maritime, and also those related to other logistics operations, are recognized in operations when the services are rendered, materials are consumed or as incurred. Financing income and costs Interest income and expense are reported as accrued using the effective interest method and are reported as part of the comprehensive financing cost.
Information by segments	4.19 Information by segments The Company has four operating segments: maritime division, logistics division, ports and terminals division and warehousing division. These operating segments are monitored by the Company’s Management, who are responsible for making strategic decisions, which are made based on adjusted operating segment results. In identifying its operating segments. Management follows Grupo TMM’s service lines, which represent the main services provided by the Company. Each of these operating segments is managed separately as each of these service lines requires different technologies and other resources as well as marketing approaches. All inter-segment transfers are carried out at market prices. The accounting policies Grupo TMM uses for segment reporting are the same as those used in its consolidated financial statements, with the exception that corporate assets which are not directly attributable to the business activities of any operating segment are not allocated. In the financial periods presented, this primarily applies to Grupo TMM’s corporate headquarters.
Significant management judgment in applying accounting policies and estimation uncertainty	4.20 Significant management judgment in applying accounting policies and estimation uncertainty When preparing the consolidated financial statements, Management considers a number of judgments, estimates and assumptions about recognition and measurement of assets, liabilities, income and expenses. Significant management judgment The reporting judgments made by Management as to the application of the accounting policies of the Company that would have a material effect on the consolidated financial statements are described following. Evaluation of control, significant influence, and joint control Management evaluates the terms of voting power with respect to its investees, the power to govern, decisions, contractual and legal agreements, upon determining if there is control, significant influence, and joint control. Significant judgment is required by evaluating some of these characteristics that can be modified over time (see Note 4.2). Estimation uncertainty Information about estimates and assumptions that have the most significant effect on the recognition and measurement of assets, liabilities, income and expenses is provided below; actual results may be substantially different. Impairment of long-lived assets On assessing impairment, Management determines the recoverable value of each asset or cash generating unit based on the expected future cash flows and determines an adequate interest rate to be able to calculate the present value of these cash flows. The uncertainty in the estimate is related to the assumptions regarding results of future operations and the determination of suitable discount rate. Useful lives of depreciable assets Management reviews the useful lives of the depreciable assets on each reporting date, based on the expected use of each asset. The uncertainty in these estimates is derived from the technical obsolescence that could change the expected use of vessels and other equipment. Defined benefits obligation Management’s estimate of the DBO is based on a number of critical assumptions, such as inflation rates, mortality rates, discount rate, and a consideration for future salary increases. The variances in these assumptions can impact the amount of the DBO and the corresponding annual expense for defined benefits (the analysis is provided in Note 23). Measures of fair value Management uses valuation techniques to measure the fair value of its vessels and properties. This results in Management preparing estimates and assumptions based on market information and using observable data that could be used by market participants to assign a price to the asset, however these are not always available. Moreover, other valuation techniques based on expected future cash flows are used for certain assets, and an interest rate is determined to calculate their present value. These fair value estimates for these non-financial assets can vary from the actual prices obtained on operations at market value on the reporting date, as well as future results and the discount rate (see Note 25). Leases – determination of the appropriate discount rate to measure lease liabilities As noted above, the Company enters into leases with third-party landlords and as a consequence the rate implicit in the relevant lease is not readily determinable. Therefore, the Company uses its incremental borrowing rate as the discount rate for determining its lease liabilities at the lease commencement date. The incremental borrowing rate is the rate of interest that the Company would have to pay to borrow over similar terms which requires estimations when no observable rates are available. These rates are, where necessary, then adjusted to reflect the credit worthiness of the entity entering into the lease and the specific condition of the underlying leased asset. The estimated incremental borrowing rate is higher than the parent company for leases entered into by its subsidiary undertakings. Effect of estimation uncertainty: The effect of a change in the incremental borrowing rate for leases entered into during the reporting period is shown in the table below: Estimate Change in estimate Effect on right-of- use asset Effect on lease liability Incremental borrowing rate 1% increase in the rate Reduces by $7,564 Reduces by $7,564

Nature of operations (Tables)

Nature of operations (Tables)	12 Months Ended
Nature of operations (Tables)	Dec. 31, 2020
Nature of operations [Abstract]
Percentage of Equity Interest in Various Subsidiaries	At December 31, 2020 and 2019, Grupo TMM holds the percentage of equity interest in various subsidiaries, the most significant are as follows: % of ownership 2020 2019 Specialized maritime Transportación Marítima Mexicana, S.A. de C.V. 100 % 100 % Inmobiliaria Dos Naciones, S. de R.L. de C.V. 100 % 100 % TMM Parcel Tankers, S.A. de C.V. 100 % 100 % Logistics Almacenadora de Depósito Moderno, S.A. de C.V. (Warehouse) 100 % 100 % Autotransportación y Distribución Logística, S.A. de C.V. 100 % 100 % TMM Almacenadora, S.A.P.I. de C.V. 100 % 100 % Ports and terminals TMM Logistics, S.A. de C.V. 100 % 100 % Prestadora de Servicios MTR, S.A. de C.V. 100 % 100 % Bimonte, S.A. de C.V. 100 % 100 % Administradora Marítima TMM, S.A.P.I. de C.V. 100 % 100 % Caoba Energía, S. de R.L. de C.V. 100 % 100 % Services & Solutions Optimus, S. de R.L de C.V. 100 % 100 % Servicios Administrativos API Acapulco, S.A. de C.V. 51 % 51 % Administración Portuaria Integral de Acapulco, S.A. de C.V. 51 % 51 % Payroll outsourcing Mexschiff Operación de Personal, S.A.P.I. de C.V. 100 % 100 % Omexmar Operadora Mexicana Marítima, S.A.P.I. de C.V. 100 % 100 % Perhafen Services Marítimos, S.A.P.I. de C.V. 100 % 100 % TMM Dirección Corporativa, S.A.P.I. de C.V. 100 % 100 % Perjomar Operadora, S.A.P.I. de C.V. 100 % 100 % Property leasing Inmobiliaria TMM, S.A. de C.V. 100 % 100 %

Summary of significant accoun_3

Summary of significant accounting policies (Tables)	12 Months Ended
Summary of significant accounting policies (Tables)	Dec. 31, 2020
Summary of significant accounting policies [Abstract]
Change of effect on incremental borrowing rate for leases	The effect of a change in the incremental borrowing rate for leases entered into during the reporting period is shown in the table below: Estimate Change in estimate Effect on right-of- use asset Effect on lease liability Incremental borrowing rate 1% increase in the rate Reduces by $7,564 Reduces by $7,564

Acquisitions and disposals (Tab

Acquisitions and disposals (Tables)	12 Months Ended
Acquisitions and disposals (Tables)	Dec. 31, 2020
Acquisitions and disposals [Abstract]
Carrying Value of Net Assets and Consideration Received	At the date of sale, the value of the assets of those subsidiaries and the consideration received was as follows: Snekke, S.A. de C.V. (a) Bamorau Servicios, S.A.P.I. de C.V. Total Current assets Other accounts receivable $ 27,786 $ - $ 27,786 Other current assets 5,388 - 5,388 Total current assets 33,174 - 33,174 Non-current assets Property 339,038 - 339,038 Total assets $ 372,212 - $ 372,212 Short-term liabilities Other accounts payable $ 25,243 - $ 25,243 Total short-term liabilities 25,243 - 25,243 Long-term liabilities Deferred income tax 58,920 - 58,920 Total liabilities $ 84,163 - $ 84,163 Total net assets $ 288,049 - $ 288,049 Consideration transferred 543,184 24,609 567,793 Gain on the disposition of subsidiaries $ 255,135 $ 24,609 $ 279,744
Details of business combination	The details of this business combination are as follows: 2019 Fair value of the consideration transferred $ 51,126 Recognized amounts of identifiable net assets Cash and cash equivalents 671 Other current assets 8,703 Land 122,481 Construction in progress 23,595 Total identifiable assets 155,450 Accounts payable 113,777 Other liabilities 373 Total liabilities assumed 114,150 Identifiable net assets $ 41,300 Goodwill on acquisition $ 9,826 Consideration transferred settled in cash $ 51,126 Cash and cash equivalents acquired receive on acquisition (671 ) Net cash outflow on acquisition $ 50,455

Cash and cash equivalents (Tabl

Cash and cash equivalents (Tables)	12 Months Ended
Cash and cash equivalents (Tables)	Dec. 31, 2020
Cash and cash equivalents [Abstract]
Cash and Cash Equivalents	Cash and cash equivalents as of December 31, 2020 and 2019, are summarized as follows: 2020 2019 Cash on hand $ 756 $ 902 Cash at banks 49,356 126,972 Short-term investments (a) 55,198 348,840 $ 105,310 $ 476,714 (a) Includes fix-term deposits (promissory notes) and repurchase/resell agreements with terms up to 3 days.

Trade receivables (Tables)

Trade receivables (Tables)	12 Months Ended
Trade receivables (Tables)	Dec. 31, 2020
Trade receivables [Abstract]
Summary of Trade Receivables	Trade receivables as of December 31, 2020 and 2019, are summarized as follows: 2020 2019 Maritime Shipyard $ 40,979 $ 34,325 Tugboats 13,981 19,406 Parcel tankers 14,485 18,217 Offshore vessels 29,864 4,737 Bulk carrier 98 906 Others - 173 Ports and terminals Shipping agencies 331 128,300 Port services 7,152 10,732 Commercial leases 106 93 Logistics, warehousing and other businesses Warehousing 27,145 44,820 Repair of containers 16,204 28,986 Automotive services 1,021 1,112 Other businesses - 1,165 Total trade receivables 151,366 292,972 Contract assets 56,215 65,443 Allowance for doubtful accounts (21,218 ) (14,385 ) $ 186,363 $ 344,030
Activity in Allowance for Doubtful Accounts	The activity in the allowance for doubtful accounts is presented below: 2020 2019 Balance as of January 1 $ 14,385 $ 22,303 Impairment loss for the period 20,140 - Receivables written off during the year - (1,847 ) Allowance cancelation recognized during the year (13,307 ) (6,071 ) Balance as of December 31 $ 21,218 $ 14,385

Other accounts receivable (Tabl

Other accounts receivable (Tables)	12 Months Ended
Other accounts receivable (Tables)	Dec. 31, 2020
Other accounts receivable [Abstract]
Summary of Other Accounts Receivable	Other accounts receivable as of December 31, 2020 and 2019, are summarized as follows: 2020 2019 Current Recoverable taxes $ 203,503 $ 306,327 Services for port, maritime and other operations 54,288 93,692 Employees 4,495 4,698 Insurance claims 818 773 Others 1,157 16,280 264,261 421,770 Non-current Value added tax recoverable (a) 238,000 - $ 502,261 $ 421,770 (a) During the 2020, the VAT recovery processes have been affected by practices of the tax authorities to extend the recovery periods.

Property, vessels and equipme_2

Property, vessels and equipment (Tables)	12 Months Ended
Property, vessels and equipment (Tables)	Dec. 31, 2020
Property, vessels and equipment [Abstract]
Summary of Property, Vessels and Equipment	Property, vessels and equipment as of December 31, 2020 and 2019 are summarized as follows: 2020 Net balances at beginning of year Additions Disposals Transfers and others Depreciation / loss from revaluation Net balances at year end Estimated useful lives(years) Vessels $ 214,938 $ - $ - $ (16,241 ) (a) $ 16,642 $ 182,055 25 Shipyard 232 - - - 42 190 40 Major vessel maintenance 15,180 - - 5,871 14,193 6,858 2.5 Buildings and facilities 299,660 3,432 - - 16,860 286,232 20 & 25 Warehousing equipment 205 616 - - 371 450 10 Computer equipment 456 214 - - 273 397 3 & 4 Terminal equipment 26,035 999 281 - 2,444 24,309 10 Ground transportation equipment 5,027 79 - 28 1,404 3,730 4,5 & 10 Other equipment 10,892 166 180 1 1,379 9,500 572,625 5,506 461 (10,341 ) 53,608 513,721 Lands 1,597,923 - - 336,422 (a) - 1,934,345 Constructions in progress 114,872 22,869 31,804 (b) (22,007 ) - 83,930 $ 2,285,420 $ 28,375 $ 32,265 $ 304,074 $ 53,608 $ 2,531,996 2019 Net beginning of year Additions Disposals Transfers and others Depreciation / loss from revaluation Net balances at year end Estimated useful lives(years) Vessels $ 782,673 $ - $ 200,119 (c), (g) $ (337,211 ) (d) $ 30,405 $ 214,938 25 Shipyard 275 - - - 43 232 40 Major vessel maintenance 41,611 1,753 12,317 (1,979 ) 13,888 15,180 2.5 Buildings and facilities 238,901 4,891 - 67,484 (e) 11,616 299,660 20 & 25 Warehousing equipment 255 419 - - 469 205 10 Computer equipment 581 249 - - 374 456 3 & 4 Terminal equipment 7,390 280 - 20,345 1,980 26,035 10 Ground transportation equipment 5,366 1,621 602 36 1,394 5,027 4,5 & 10 Other equipment 7,079 446 - 4,663 1,296 10,892 1,084,131 9,659 213,038 (246,662 ) 61,465 572,625 Lands 1,146,252 - - 451,671 (e) - 1,597,923 Constructions in progress 83,054 38,622 (f) - (6,804 ) - 114,872 $ 2,313,437 $ 48,281 $ 213,038 $ 198,205 $ 61,465 $ 2,285,420 All the amounts for depreciation and for loss from revaluation are included as part of the depreciation, amortization, and loss from revaluation on the consolidated statements of profit or loss. The accumulated depreciation on property, vessels and equipment at December 31, 2020 and 2019 is $290,056 and $261,862, respectively. (a) It is mainly comprised of the surplus for revaluation of land for $ 330,571 and a deficit for revaluation of vessels for $ 16,135. (b) Corresponds mainly to the cancellation of the project called “Terminal Quintana Roo”, derived from changes in the conditions of the project previously considered by Management. (c) On August 30, 2019, the sale of the vessel SMR Manzanillo to Bricor Servicios Portuarios Mexicanos, S.A. de C.V. by Transportación Marítima Mexicana, S.A. de C.V., a subsidiary of Grupo TMM, was complete for an amount of $15,703, generating a profit of $ 4,410. (d) It is comprised mainly of disposal of the TMM Colima vessel in the divestiture of Snekke, S.A. de C.V. of Grupo TMM for $339,038, which is partially offset by the revaluation surplus of $1,827. (e) Includes the surplus for revaluation of lands and properties for $310,833 and $66,518, respectively. (f) Corresponds to the construction of infrastructure for various projects related to the storage and transportation of hydrocarbons and refined petroleum products. (g) During 2018, the offshore vessel ‘Subsea 88’ suffered a major mishap in one of its areas and for which it stopped operating. As of December 31, 2018, Grupo TMM was making the corresponding insurance claims without a final settlement having been issued on the mishap as of that date. Since the repair of the ship requires a substantial time that affects future cash flows, Management recognized a loss in fair value in the amount of $206,076.
Cost Model Revalued Carrying Amounts	If the cost model had been used, the revalued carrying amounts for vessels, land and properties as of December 31, 2020 and 2019, would be as follows: 2020 2019 Vessels $ 102,993 $ 108,414 Lands 715,616 715,616 Properties 140,360 147,747 $ 958,969 $ 971,777

Leases (Tables)

Leases (Tables)	12 Months Ended
Leases (Tables)	Dec. 31, 2020
Leases [Abstract]
Right-of-Use Assets	Right-of-use assets 2020 Warehouse Cranes Courtyards Major vessel maintenance Corporate building Total Gross carrying amount Balance 1 January 2020 $ 83,968 $ 3,112 $ 60,035 $ 10,834 $ 513,735 $ 671,684 Additions 216,548 8,610 - 22,135 92,170 339,463 Disposals 12,875 - - 10,834 513,735 (a) 537,444 Balance at 31 December 2020 287,641 11,722 60,035 22,135 92,170 473,703 Depreciation Balance 1 January 2020 40,212 2,197 10,794 8,667 49,715 111,585 Disposals 1,884 - - 10,834 62,146 74,864 Depreciation 44,708 4,960 11,701 6,317 15,064 82,750 Balance 31 December 2020 83,036 7,157 22,495 4,150 2,633 119,471 Carrying amount 31 December 2020 $ 204,605 $ 4,565 $ 37,540 $ 17,985 $ 89,537 $ 354,232 2019 Warehouse Cranes Courtyards Major vessel maintenance Corporate building Total Gross carrying amount Balance 1 January 2019 $ - $ - $ - $ - $ - $ - Additions 83,968 3,112 60,035 10,834 513,735 671,684 Disposals - - - - - - Balance at 31 December 2019 83,968 3,112 60,035 10,834 513,735 671,684 Depreciation Balance 1 January 2019 - - - - - - Disposals - - - - - - Depreciation 40,212 2,197 10,794 8,667 49,715 111,585 Balance 31 December 2019 40,212 2,197 10,794 8,667 49,715 111,585 Carrying amount 31 December 2019 $ 43,756 $ 915 $ 49,241 $ 2,167 $ 464,020 $ 560,099 (a) It corresponds to the cancellation of the rental agreement of the former corporate headquarters located on Av. De la Cuspide, which generates an effect on profit or loss in the amount of $113,469, which is presented in the caption of other (expenses) income (See note 19). In accordance with the agreement, the Company is bound to pay an amount of 158 thousand dollars monthly for 4 years, which will be conditioned to the rent or sale by the lessor of the real property.
Lease Information	As of December 31, 2020 and December 31, 2019, the information on leases is summarized below: 2020 Short-term Long-term Payable in Mexican pesos Warehouse $ 33,916 $ 174,894 Cranes 4,272 488 Courtyards 8,260 33,030 Major vessel maintenance 6,490 13,214 Payable in US dollars Corporate building 5,307 75,642 $ 58,245 $ 297,268 2019 Short-term Long-term Payable in Mexican pesos Warehouse $ 32,673 $ 14,094 Cranes 963 - Courtyards 10,285 41,248 Major vessel maintenance 2,269 - Payable in US dollars Corporate building 14,388 471,439 $ 60,578 $ 526,781
Leasing Activities by Type of Right-of-Use Asset	The table below describes the nature of Grupo TMM’s leasing activities by type of right-of-use asset recognized in the consolidated statement of financial position: Right-of-use asset No. of right-of-use assets leased Range of remaining term (years) No. of leases with extension options No. of leases with purchase option No. of leases with variable payments linked to an index No. of leases with termination options Corporate headquarters 1 8 - - 1 - Warehouse 6 1 - 5 2 - 6 - Courtyards 5 1 – 6 5 - 5 - Cranes 1 2 - - - - Major vessel maintenance 1 4 - - - -
Minimum Future Lease Payments	Future minimum lease payments at 31 December 2020 and 2019 were as follows: Within the 1st year 1 to 3 years 3 to 5 years After 5 years Total Balance at December 31, 2020 Lease payments $ 95,914 $ 178,415 $ 152,179 $ 54,620 $ 481,128 Financial charges (37,669 ) (55,149 ) (23,783 ) (9,014 ) (125,615 ) Present values, net $ 58,245 $ 123,266 $ 128,396 $ 45,606 $ 355,513 Balance at December 31, 2019 Lease payments $ 121,847 $ 185,494 $ 198,259 $ 427,355 $ 932,955 Financial charges (61,269 ) (108,101 ) (87,429 ) (88,797 ) (345,596 ) Present values, net $ 60,578 $ 77,393 $ 110,830 $ 338,558 $ 587,359
Expense Relating to Payments not Included in Measurement of Lease Liability	The expense relating to payments not included in the measurement of the lease liability is as follows: 2020 2019 Short-term leases (a) $ 307,643 $ 296,770 Leases of low-value assets 4,820 3,696 $ 312,463 $ 300,466 (a) Corresponds to the leasing of parcel and bulk carrier vessels.

Concession rights (Tables)

Concession rights (Tables)	12 Months Ended
Concession rights (Tables)	Dec. 31, 2020
Concession rights [Abstract]
Summary of Concession Rights	As of December 31, 2020 and 2019, the concession rights are as follows: 2020 2019 Years to amortize Administración Portuaria Integral de Acapulco (a) $ 94,607 $ 94,607 10 Transportación Marítima Mexicana (b) - - - 94,607 94,607 Accumulated amortization (92,715 ) (88,931 ) Concession rights, net $ 1,892 $ 5,676 (a) As of December 31, 2020 and 2019, the Company holds concession to operate the cruise and vehicle terminal at the port of Acapulco, Guerrero. Under this concession agreements, the Company is obliged to keep the facilities included in the concession in good condition, as well as making monthly payments (fixed and variable), related to the operation (see Note 28). At December 31, 2020 and 2019, the Company was in compliance with its obligation to maintain the concession facilities in good condition. The amortization of the concession rights was $3,784 for the years ended December 31, 2020 and 2019. Monthly payments to the Administración Portuaria Integral de Acapulco were $7,507 and $7,536 in 2020 and 2019, respectively. (b) As of December 31, 2018, the Company maintained the concession rights to operate the tug services in the Port of Manzanillo, Colima. This concession was renewed in October 2014, expiring on January 16, 2023, with the possibility of being renewed for another eight years.

Intangible assets (Tables)

Intangible assets (Tables)	12 Months Ended
Intangible assets (Tables)	Dec. 31, 2020
Intangible assets [Abstract]
Summary of Intangible Assets	Intangible assets as of December 31, 2020 and 2019, are summarized as follows: 2020 Net balances at beginning of year Additions Transfers and others Amortization Net balances at year end Estimated useful life (years) Software $ 15,956 $ 10,508 (b) $ - $ 742 $ 25,722 3 y 5 Trademark (a) 125,528 - - 125,528 Indefinite $ 141,484 $ 10,508 $ - $ 742 $ 151,250 2019 Net balances at beginning of year Additions Transfers and others Amortization Net balances at year end Estimated useful life (years) Software $ 909 $ 19,048 $ - $ 4,001 $ 15,956 3 y 5 Trademark (a) 125,528 - - - 125,528 Indefinite $ 126,437 $ 19,048 $ - $ 4,001 $ 141,484 (a) Corresponds to the rights on the Marmex trademark associated with the specialized maritime division segment, specifically the offshore vessels operation. This trademark is subject to annual impairment testing (see Note 13). (b) Corresponds mainly to the SAP Hana system upgrade project.

Impairment of long-lived asse_2

Impairment of long-lived assets (Tables)	12 Months Ended
Impairment of long-lived assets (Tables)	Dec. 31, 2020
Impairment of long-lived assets [Abstract]
Present Value of Expected Cash Flows for Each Segment	The present value of the cash flows expected for each segment was determined applying an appropriate discount rate. 2020 2019 Growth rate Discount rate Growth rate Discount rate Vessels 2.00 % 7.45 % 2.00 % 7.19 %

Financial assets and liabilit_2

Financial assets and liabilities (Tables)	12 Months Ended
Financial assets and liabilities (Tables)	Dec. 31, 2020
Financial assets and liabilities [Abstract]
Financial Assets	The financial assets and liabilities as of December 31, 2020 and 2019, are summarized as follows: 2020 2019 Financial assets Valued at amortized cost Cash and cash equivalents $ 105,310 $ 476,714 Restricted cash 37,672 36,085 Trade receivables 130,148 278,587 Other accounts receivable 60,758 115,443 Related parties 42,228 163,344 Total current financial assets $ 376,116 $ 1,070,173 Financial liabilities Valued at amortized cost Short-term portion of the financial debt $ 129,085 $ 139,189 Trade payables 228,959 262,159 Accounts payable and accrued expenses 486,827 461,892 Related parties 1,458 87,573 Total short-term portion of the financial debt 846,329 950,813 Long-term financial debt 53,644 118,737 Total financial liabilities $ 899,973 $ 1,069,550
Financial Liabilities	The financial assets and liabilities as of December 31, 2020 and 2019, are summarized as follows: 2020 2019 Financial assets Valued at amortized cost Cash and cash equivalents $ 105,310 $ 476,714 Restricted cash 37,672 36,085 Trade receivables 130,148 278,587 Other accounts receivable 60,758 115,443 Related parties 42,228 163,344 Total current financial assets $ 376,116 $ 1,070,173 Financial liabilities Valued at amortized cost Short-term portion of the financial debt $ 129,085 $ 139,189 Trade payables 228,959 262,159 Accounts payable and accrued expenses 486,827 461,892 Related parties 1,458 87,573 Total short-term portion of the financial debt 846,329 950,813 Long-term financial debt 53,644 118,737 Total financial liabilities $ 899,973 $ 1,069,550
Information for Financing	The information for financing as of December 31, 2020 and 2019 is summarized as follows: 2020 2019 Short-term Long-term Short-term Long-term Payable in Mexican pesos Daimler Financial Services México, S. de R.L. de C.V $ 16,333 $ - $ 9,504 $ 9,074 Recognition of debt and substitution of debtor for $40.9 million at a fixed rate of 12%, with monthly payments of principal and interest and maturing in November 2019. In order to improve the profile of the schedule of payments, a new debt recognition was formalized on October 11, 2018, in the amount of $28 million at a 12.9% fixed rate, with monthly payments on principal and interest, due October 2021. In order to face the effects of the Covid-19 pandemic, the Company obtained two grace periods of 3 months each for the principal payment from April to September 2020, extending the term of the loan to January 2022. The Company is currently in the process of negotiating with the finance company to restructure the debt repayment schedule. Banco Autofin México, S.A. Institución de Banca Múltiple 23,352 12,773 23,319 28,477 Five lines of credit with mortgage surety for $45.8, $34.6, $25.5, $21.6, and $8.4 million at a variable rate of the 28-day TIIE plus 450 basis points, with monthly payments of principal and interest, maturing September 2021. On November 26, 2018, a new line of credit was drawn down in the amount of $20 million at a variable rate at 28-day TIIE, plus 550 base points, due November 2023. In order to face the effects of the Covid-19 pandemic, the Company obtained a grace period of 6 months in the payment of principal of 4 of the 6 lines, the period applies from the months of January to June of 2020, extending the maturity of those lines correspondingly. INPIASA, S.A. de C.V. 1,435 - 1,566 1,044 Contract for line of credit, the first for $15.7 million at a variable rate of the 28-day TIIE plus 450 basis points, with monthly payments of principal and interest, and maturing August 2021. HSBC, S.A. 951 - 1,629 543 $9.77 million line of credit at a variable rate of the 28-day TIIE plus 300 points, with monthly payments of principal and interest, and maturing April 2021. In order to face the effects of the Covid-19 pandemic, the Company obtained a grace period of 3 months in the payment of principal from the months of May to July 2020, extending the term of each credit line 3 months. Banco del Bajío, S.A. Intemza 211 - 842 - $9.36 million line of credit at a variable rate of the 28-day TIIE plus 250 points, with monthly payments of principal and interest, and maturing August 2020. In order to face the effects of the Covid-19 pandemic, the Company obtained a 6-month grace period in the payment of principal from April to September 2020, extending the term of each credit line 6 months. Banco del Bajío, S.A. - - 23,227 - $24.0 million line of credit at a variable rate of the 28-day TIIE plus 600 points, with monthly payments of principal and interest; and maturing in March 2020. 2020 2019 Short-term Long-term Short-term Long-term Banco del Bajío, S.A. 1,714 9,571 - - $12.0 million line of credit line with a mortgage guarantee for $30.0 million, variable rate of TIIE 28 days plus 600 points, with monthly payments of principal and interest, maturing in July 2027. Portafolio de Negocios, S.A. de C.V. SOFOM 2,738 6,334 - - Line of credit for $10.0 million with a fixed rate of 15.0%, with monthly payments of principal and interest; maturity in July 2023, without prepayment penalty. Other investors 12,000 - - - Two unsecured loans were contracted, each for $6.0 million at a fixed rate of 15.0% per annum, with principal and interest payments due, originally in October 2020. The Company is in negotiation extending the payment term, as well as the conditions of both credits. Interest payable 563 - 410 - 59,297 28,678 60,497 39,138 Total financial debt in Mexican pesos ACT Maritime, LLC - - 15,843 57,349 A line of credit at 5 years was contracted in September 2018 in the amount of $5.52 million dollars with a variable Libor rate at 90 days plus 750 points, with quarterly payments of principal and interest, due September 2023. The total credit line that it had with DVB Bank America NV was totally liquidated with the proceeds of this line. In December 2020, the Company prepaid the total credit line, with the advance received for the sale of the Olmeca vessel (see Note 29). Others 59,806 - 56,618 - Unsecured credits were contracted, each one amounting to $3 million dollars at a fixed rate of 11.25%, with semiannual payments of principal and interest, originally due January 2016. Both credits were contracted again in January 2017, and $1 million dollars on one of them was paid and both were due in July 2017. The payment rescheduling and outstanding balance amounting to $5 million dollars were formalized in July 2017, with a fixed rate of 11.25% with monthly payments on interest and principal, due July 2018. A new rescheduling of payments and unpaid balance amounting to $4.5 million dollars was formalized in July 2018, with an 11.25% fixed rate with monthly interest payments. The principal amounting to $500 thousand dollars was paid in July 2018, and the balance of $4 million dollars is due in July 2019. 2020 2019 Short-term Long-term Short-term Long-term In order to improve the amortization profile, the Company continued its negotiations with creditors to define a new amortization schedule. On December 20, 2019, the payment of $ 1.0 million dollars was made. In July 2020, the rescheduling of payments for $3.0 million dollars was formalized, with a fixed rate of 11.25% with monthly payments of interest and principal due in July 2021. The Company is in negotiations to improve the conditions and amortization profile of the balance of the current credit. Hewlett Packard 4,180 14,679 2,354 9,263 Two lines of credit for $607.8 dollars and $201.6 dollars, at a fixed rate of 6.84% and 6.13%, monthly payments of principal and interest on unpaid balances and maturing in March and October 2024, respectively. In order to face the effects of the Covid-19 pandemic, the Company obtained a grace period of 3 months in the payment of principal for the months of May to July, extending the term of each credit line 3 months. In order to continue with the Company’s technological transformation strategy, 3 additional simple credit lines were contracted for $86.6 thousand dollars, $96.9 thousand dollars and $ 252.1 thousand dollars, at a fixed rate of 5.96%, 7.16% and 4.58% fixed annual, respectively, monthly payments of principal and interest on unpaid balances and maturing in March, April and August 2025. PNC, Bank, N.A. 3,429 10,287 3,246 12,987 Line of credit with collateral for $860 thousand dollars, at a fixed rate of 4.40%, semiannual payments of principal and interest on unpaid balances and maturing in July 2024. Interest payable 2,373 - 631 - Total financial debt in US dollars 69,788 24,966 78,692 79,599 Total financial debt $ 129,085 $ 53,644 $ 139,189 $ 118,737 (a) They correspond to judicial and private agreements signed for the debt recognition with respect to Deposit Certificates secured and backed by Almacenadora de Depósito Moderno, S.A. de C.V. (ADEMSA), a related party.
Maturity of Long-term Financial Debt	The maturity of the long-term financial debt as of December 31, 2020 and 2019 is as follows: Maturity 2020 2019 2021 $ - $ 57,017 2022 23,638 31,861 2023 16,315 25,427 2024 8,275 4,427 2025 2,703 5 2026 2,713 - $ 53,644 $ 118,737

Balances and transactions wit_2

Balances and transactions with related parties (Tables)	12 Months Ended
Balances and transactions with related parties (Tables)	Dec. 31, 2020
Balances and transactions with related parties [Abstract]
Transactions with Related Parties	The accounts payable and transactions with related parties as of December 31, 2020 and 2019 are summarized as follows: 2020 2019 Receivable Payable Receivable Payable TMM División Marítima, S.A. de C.V. (a) $ 42,228 $ - $ 163,344 $ - SSA México, S.A. de C.V. (b) - 1,458 - 87,573 $ 42,228 $ 1,458 $ 163,344 $ 87,573 (a) The accounts receivable is related to the maritime services provided to TMM DM by Grupo TMM. In (b) The accounts payables to SSA México, S.A. de C.V. are largely due to subagency services that this related party provides to Grupo TMM. The most relevant transactions with related parties as of December 31, 2020, 2019 and 2018 are summarized as follows: 2020 2019 2018 Revenue: Maritime services (a) $ 131,137 $ 159,772 $ 187,426 Shipping agency services (b) 499 758 - Leases (c) - - 66 $ 131,636 $ 160,530 $ 187,492 Costs: Sub-agency commissions (d) $ 107,692 $ 264,743 $ - Expenses: Other expenses (e) $ 440 $ 391 $ 366 (a) Maritime services between TMM Dirección Corporativa, S.A. de C.V, subsidiary of Grupo TMM, and TMM DM. (b) Shipping agency services between Administradora Marítima TMM, S.A.P.I. de C.V., subsidiary of Grupo TMM, and TMM DM. (c) Grupo TMM, S.A.B. leasing operation with SSA México, S.A. de C.V. in Acapulco, Guerrero. (d) Shipping agency servicies provided by SSA México, S.A. de C.V. to Administradora Marítima TMM, S.A.P.I. de C.V. (e) Management consulting provided by SSA México, S.A. de C.V. to Administración Portuaria Integral de Acapulco, S.A. de C.V.
Transactions Involving Executive Personnel	Transactions involving executive personnel for the years ended December 31, 2020, 2019 and 2018, include the following expenses: 2020 2019 2018 Short-term benefits Salaries $ 36,003 $ 40,851 $ 33,790 Social security costs 1,633 497 462 $ 37,636 $ 41,348 $ 34,252

Accounts payable and accrued _2

Accounts payable and accrued expenses (Tables)	12 Months Ended
Accounts payable and accrued expenses (Tables)	Dec. 31, 2020
Accounts payable and accrued expenses [Abstract]
Accounts Payable and Accrued Expenses	Accounts payable and accrued expenses at December 31, 2020 and 2019, are shown as follows: 2020 2019 General expenses $ 259,151 $ 212,595 Operating expenses 57,929 96,004 Purchased services 89,976 95,470 Taxes payable 38,281 37,637 Salaries and wages 924 3,256 Others 78,847 54,567 $ 525,108 $ 499,529

Stockholders' equity (Tables)

Stockholders' equity (Tables)	12 Months Ended
Stockholders' equity (Tables)	Dec. 31, 2020
Stockholders' equity [Abstract]
Details of Other Components of Equity	Details of other components of equity as of December 31, 2020 and 2019, as follows: Statutory Defined benefit Premium on convertible obligations Translation result Revaluation surplus Total Balance as of December 31, 2018 $ 216,948 $ (125 ,417 ) $ 77,106 $ (247,668 ) $ 785,975 $ 706,944 Revaluation of assets - - - - 379,420 379,420 Defined benefit plan - 2,354 - - - 2,354 Reclassification from disposal of properties and depreciation - - - - (202,228 ) (a) (202,228 ) Total before taxes - 2,354 - - 177,192 179,546 Tax expense - (706 ) - - (113,826 ) (114,532 ) Total net of taxes - 1,648 - - 63, 366 65,014 Balance as of December 31, 2019 216,948 (123,769 ) $ 77,106 $ (247,668 ) $ 849,341 $ 771,958 Statutory Defined benefit Premium on convertible obligations Translation result Revaluation surplus Total Revaluation of assets - - - - 314,436 (b) 314,436 Defined benefit plan - 10,953 - - - 10,953 Reclassification from revaluation of assets - (55 ) (a) (55 ) Total before taxes - 10,953 - - 314,381 325,334 Tax expense - (3,286 ) - - (94,331 ) (97,617 ) Total net of taxes - 7,667 - - 220,050 227,717 Balance as of December 31, 2020 $ 216,948 $ (116,102 ) $ 77,106 $ (247,668 ) $ 1,069,391 $ 999,675 (a) It corresponds to the reclassification of the revaluation surplus to accumulated losses from the sale of properties and disposals of vessels, as well as the depreciation for the period of revaluation of properties and vessels. (b) Corresponds to the revaluation of the land of the project called “Liquid Storage Terminal”, derived from changes in the conditions of the project generated by obtaining permits, the revaluation allows the Management to know the fair value of the property based on at its best use.

Revenues (Tables)

Revenues (Tables)	12 Months Ended
Revenues (Tables)	Dec. 31, 2020
Revenues [Abstract]
Summary of Revenue	The revenues as of December 31, 2020, 2019 and 2018, are summarized as follows: 2020 2019 2018 Maritime Parcel tankers $ 340,767 $ 287,140 $ 312,305 Maritime administration services 131,136 159,772 187,426 Shipyard 100,864 164,917 138,517 Bulk carrier 85,085 162,897 144,664 Tugboats - 81,707 70,037 Offshore vessels 93,373 12,072 56,506 Ports and terminals Port services 41,659 90,144 101,688 Shipping agencies 27,530 79,695 64,283 Logistics, warehousing and other businesses Repair of containers 196,584 211,171 234,534 Warehousing 139,042 171,867 160,991 Intermodal terminal 41,794 49,157 47,581 Automotive services 5,447 5,144 4,534 Total consolidated revenue $ 1,203,281 $ 1,475,683 $ 1,523,066

Other (expenses) income (Tables

Other (expenses) income (Tables)	12 Months Ended
Other (expenses) income (Tables)	Dec. 31, 2020
Other (expenses) income [Abstract]
Other (Expenses) Income	Other (expenses) income as of December 31, 2020, 2019 and 2018, is summarized as follows: 2020 2019 2018 Gain (loss) from the sale of subsidiaries (see Note 5) $ 451 $ 279,744 $ 111,484 Recoveries of taxes paid in prior years, net of expenses for recovery (11,145 ) (16,595 ) (3, 919 ) Cancellation of projects (31,804 ) (18,944 ) (5,604 ) Forgiveness of accounts receivable (98,859 ) - - Expenses related to the cancellation of the corporate building lease (113,469 ) - - Goodwill impairment (see Note 5) - (9, 826 ) - Other, net (2,399 ) (472 ) 664 $ (257,225 ) $ 233,907 $ 102,625

Interest expense and other fi_2

Interest expense and other financial costs (Tables)	12 Months Ended
Interest expense and other financial costs (Tables)	Dec. 31, 2020
Interest expense and other financial costs [Abstract]
Interest Expense and Other Financial Costs	This line at December 31, 2020, 2019 and 2018, is comprised as follows: 2020 2019 2018 Interest on financial debt $ 38,558 $ 69,796 $ 80,580 Interest expense on leasing arrangements 33,535 70,225 - Other financial expenses 2,066 5,303 2,146 Amortization of transaction cost associated with financial debt 1,495 1,551 2,164 $ 75,654 $ 146,875 $ 84,890

Income tax and tax loss carry_2

Income tax and tax loss carryforwards (Tables)	12 Months Ended
Income tax and tax loss carryforwards (Tables)	Dec. 31, 2020
Income tax and tax loss carryforwards [Abstract]
Provision for Income Tax Recognized in the Statement of Profit or Loss	The provision for income tax recognized in the statement of profit or loss for the years ended December 31, 2020, 2019 and 2018, is as follows: 2020 2019 2018 Income tax $ (10,873 ) $ (14,512 ) $ (4,799 ) Income tax (agreement) (a) - (85,196 ) - Deferred income tax 30,207 35,133 - Total income tax expense $ 19,334 $ (64,575 ) $ (4,799 ) (a) During 2019, Grupo TMM agreed with the Tax Administration Service to resolve the Company’s outstanding tax liabilities for the fiscal year 2010 through payment of 2.6 million pesos over a period of 36 months beginning in November 2019.
Reconciliation of the Provision for Income Tax	The reconciliation between the provision for income tax based on the statutory income tax rate and the provision recorded by the Company at December 31, 2020, 2019 and 2018, is as follows: 2020 2019 2018 (Loss) profit before taxes $ (422,490 ) $ 95,867 $ 28,348 Income tax 126,747 (28,760 ) (8,504 ) Increase (decrease) from: Difference in depreciation and amortization (86,033 ) (180,395 ) (56,356 ) Revaluation surplus 94,331 113,826 (48,424 ) Income recognized in advance - - (62 ) Materials and supplies 3,625 (31,073 ) (19,888 ) Inflationary and currency exchange effects on monetary assets and liabilities, net (4,035 ) 1,236 (26,686 ) Tax losses – net 12,054 19,277 206,485 Provisions and allowance for doubtful accounts (78,527 ) 54,214 (44,609 ) Forgiveness of accounts receivable (29,658 ) - - Difference between the tax and book value for the sale of assets (14,276 ) (13,133 ) (15,551 ) Difference between the tax and book value for the sale of shares of subsidiaries (104 ) 97,284 20,800 Non-deductible expenses (4,790 ) (11,855 ) (12,004 ) Income tax (agreement) - (85,196 ) - Benefit (provision) for income tax $ 19,334 $ (64,575 ) $ (4,799 )
Components of Deferred Tax Liability	The components of deferred tax liability at December 31, 2020 and 2019, are comprised as follows: 2020 2019 Portion of tax loss carryforwards for subsequent years $ 350,272 $ 338,218 Inventories and provisions – net 41,080 51,657 Concession rights and property, vessels and equipment (706,976 ) (638,089 ) Total deferred tax liability $ (315,624 ) $ (248,214 )
Cumulative Tax Losses	As of December 31, 2020, Grupo TMM and its subsidiaries, report the following cumulative tax losses, which are restated applying the National Consumer Price Index (NCPI) factors in accordance with Mexican law. Year in which the loss was incurrred Amounts Year of expiration 2011 $ 66,483 2021 2012 168,689 2022 2013 199,466 2023 2014 142,463 2024 2015 69,170 2025 2016 410,181 2026 2017 103,125 2027 2018 216,620 2028 2019 491,902 2029 2020 434,618 2030 $ 2,302,717

Segment reporting (Tables)

Segment reporting (Tables)	12 Months Ended
Segment reporting (Tables)	Dec. 31, 2020
Segment reporting [Abstract]
Information for Operating Segments	There are no changes in the measuring methods used to calculate the earnings reported for each segment. The information for each operating segment is as follow: Specialized maritime division Logistics division Ports and terminals division Warehousing division Other businesses and shared accounts Total consolidated December 31, 2020 Revenue $ 751,225 $ 243,825 $ 69,189 $ 139,042 $ - $ 1,203,281 Costs and expenses (634,919 ) (217,699 ) (74,521 ) (110,309 ) - (1,037,448 ) Corporate expenses - - - - (96,345 ) (96,345 ) Depreciation and amortization (41,764 ) (22,571 ) (15,423 ) (45,261 ) (16,032 ) (141,051 ) Transportation profit (loss) $ 74,542 $ 3,555 $ (20,755 ) $ (16,528 ) $ (112,377 ) $ (71,563 ) Costs, expenses and revenue not allocated (331,593 ) Net profit for the year $ (403,156 ) Total assets by operating segment $ 1,060,473 $ 250,188 $ 1,664,819 $ 539,521 $ - $ 3,515,001 Shared assets - - - - 515,546 515,546 Total assets $ 1,060,473 $ 250,188 $ 1,664,819 $ 539,521 $ 515,546 $ 4,030,547 Total liabilities by operating segment $ 363,098 $ 141,723 $ 498,233 $ 345,091 $ - $ 1,348,145 Shared liabilities - - - - 434,994 434,994 Total liabilities $ 363,098 $ 141,723 $ 498,233 $ 345,091 $ 434,994 $ 1,783,139 Total capital expenditures by segment $ 7,608 $ 33 $ 5,137 $ 4,086 $ - $ 16,864 Shared capital expenditures - - - - 11,511 11,511 Total capital expenditures $ 7,608 $ 33 $ 5,137 $ 4,086 $ 11,511 $ 28,375 December 31, 2019 Revenue $ 868,505 $ 265,472 $ 169,839 $ 171,867 $ - $ 1,475,683 Costs and expenses (652,157 ) (232,386 ) (122,882 ) (132,792 ) - (1,140,217 ) Corporate expenses - - - - (173,726 ) (173,726 ) Depreciation and amortization (66,306 ) (19,474 ) (15,186 ) (41,516 ) (40,398 ) (182,880 ) Transportation profit (loss) $ 150,042 $ 13,612 $ 31,771 $ (2,441 ) $ (214,124 ) $ (21,140 ) Costs, expenses and revenue not allocated 52,432 Net profit for the year $ 31,292 Total assets by operating segment $ 1,285,751 $ 266,079 $ 1,763,135 $ 386,418 $ - $ 3,701,383 Shared assets - - - - 862,392 862,392 Total assets $ 1,285,751 $ 266,079 $ 1,763,135 $ 386,418 $ 862,392 $ 4,563,775 Total liabilities by operating segment $ 431,893 $ 158,203 $ 567,030 $ 173,616 $ - $ 1,330,742 Shared liabilities - - - - 810,241 810,241 Total liabilities $ 431,893 $ 158,203 $ 567,030 $ 173,616 $ 810,241 $ 2,140,983 Total capital expenditures by segment $ 12,048 $ 598 $ 24,086 $ 494 $ - $ 37,226 Shared capital expenditures - - - - 11,055 11,055 Total capital expenditures $ 12,048 $ 598 $ 24,086 $ 494 $ 11,055 $ 48,281 Specialized maritime division Logistics division Ports and terminals division Warehousing division Other businesses and shared accounts Total consolidated December 31, 2018 Revenue $ 909,455 $ 286,649 $ 165,971 $ 160,991 $ - $ 1,523,066 Costs and expenses (727,535 ) (248,364 ) (106,993 ) (165,388 ) (473 ) (1,248,753 ) Corporate expenses - - - - (198,404 ) (198,404 ) Depreciation and amortization (59,451 ) (2,772 ) (9,616 ) (1,305 ) (7,133 ) (80,277 ) Transportation profit (loss) $ 122,469 $ 35,513 $ 49,362 $ (5,702 ) $ (206,010 ) $ (4,368 ) Costs, expenses and revenue not allocated 27,917 Net profit for the year $ 23,549 Total assets by operating segment $ 1,820,844 $ 240,024 $ 866,849 $ 294,326 $ - $ 3,222,043 Shared assets - - - - 559,041 559,041 Total assets $ 1,820,844 $ 240,024 $ 866,849 $ 294,326 $ 559,041 $ 3,781,084 Total liabilities by operating segment $ 887,042 $ 159,956 $ 280,473 $ 66,583 $ - $ 1,394,054 Shared liabilities - - - - 262,772 262,772 Total liabilities $ 887,042 $ 159,956 $ 280,473 $ 66,583 $ 262,772 $ 1,656,826 Total capital expenditures by segment $ 42,745 $ 592 $ 13,176 $ 582 $ - $ 57,095 Shared capital expenditures - - - - 29,188 29,188 Total capital expenditures $ 42,745 $ 592 $ 13,176 $ 582 $ 29,188 $ 86,283

Employee benefits (Tables)

Employee benefits (Tables)	12 Months Ended
Employee benefits (Tables)	Dec. 31, 2020
Employee benefits [Abstract]
Expenses Recognized for Employee Benefits	The expenses recognized for employee benefits are: 2020 2019 2018 Salaries, benefits and inherent $ 317,776 $ 320,827 $ 347,403 Pensions – defined benefit plans 23,623 22,873 21,211 $ 341,399 $ 343,700 $ 368,614
Liabilities Recognized for Pensions and Other Remunerations	The long-term liabilities recognized for pensions and other employee remunerations in the consolidated statement of financial position are comprised as follows: 2020 2019 Long-term: Pensions and seniority premium $ 136,832 $ 141,014 Termination of employment 13,365 10,467 $ 150,197 $ 151,481
Details of Net Cost for the Period	The details of the net cost for the period for seniority premiums and termination of employment, and also the basic actuarial estimates for the calculation of these labor obligations is shown as follows: 2020 2019 Pensions and seniority premiums Termination of employment Pensions and seniority premiums Termination of employment Current service cost $ 4,541 $ 1,727 $ 4,709 $ 2,178 Interest cost 11,892 867 13,643 2,343 Net cost for the period $ 16,433 $ 2,594 $ 18,352 $ 4,521
Reserve for Pensions and Seniority Premiums	At December 31, 2020 and 2019, the reserve for pensions and seniority premiums, and also for the termination of employment, is comprised as follows: 2020 2019 Pensions and seniority premiums Termination of employment Pensions and seniority premiums Termination of employment Defined benefit obligations $ 139,763 $ 13,365 $ 144,044 $ 10,467 Plan assets (2,931 ) - (3,030 ) - Total reserve $ 136,832 $ 13,365 $ 141,014 $ 10,467
Defined Benefit Obligation	As of December 31, 2020, and 2019, the defined benefit obligations (DBO) for pensions and seniority premiums, and also for the reserve for termination of employment, are comprised as follows: 2020 2019 Pensions and seniority premiums Termination of employment Pensions and seniority premiums Termination of employment DBO at beginning of period $ 144,044 $ 10,467 $ 154,128 $ 25,604 Current service cost 4,541 1,727 4,709 2,178 Interest cost 11,892 867 13,643 2,343 Benefits paid (2,072 ) (70 ) (338 ) - Benefits paid from plan assets (7,315 ) - (7,617 ) - Miscellaneous - - (304 ) - Past service cost - - (16,822 ) (21,365 ) Actuarial gain or losses (11,327 ) 374 (3,355 ) 1,707 DBO at end of period $ 139,763 $ 13,365 $ 144,044 $ 10,467 The plan assets as of December 31, 2020 and 2019 are comprised as follows: 2020 2019 Value of the fund at beginning of year $ 3,030 $ 3,126 Expected return on assets (356 ) 310 Plan contributions 7,315 7,617 Benefits paid (7,315 ) (7,617 ) Interests on plan assets 257 208 Miscellaneous - (614 ) Found value at end of the year $ 2,931 $ 3,030
Effects of Changes to Actuarial Assumptions	The changes in the pension plan, seniority premium, and termination of employment plan as of December 31, 2020 and 2019 are as follows: 2020 2019 Reserve for obligations at the beginning of the period $ 151,481 $ 176,606 Cost for the period 19,027 22,873 Interest income (257 ) (208 ) Contributions to the plan (7,315 ) (7,617 ) Benefits paid on pension plan (2,142 ) (338 ) Miscellaneous 356 - Actuarial gain or losses (10,953 ) (1,648 ) Past service cost - (38,187 ) Reserve for obligations at the end of the period $ 150,197 $ 151,481 The significant actuarial assumptions used for the valuation are: 2020 2019 Discount rate 7.50 % 8.50 % Salary increase rate 4.00 % 4.00 % Inflation rate 3.50 % 3.50 % Average working life expectancy 16.10 18.30 The following table summarizes the effects of changes to these actuarial assumptions on the defined benefits obligations at December 31, 2020: 1.0% increase 1.0% decrease Discount rate (Decrease) increase in the defined benefits obligation $ (54 ) $ 6,958 Salary increase rate Increase (decrease) in the defined benefits obligation $ 5,711 $ (678 ) One year Increase One year Decrease Average life expectancies Increase (decrease) in the defined benefits obligation $ 3,426 $ (3,940 )

Fair value measurement (Tables)

Fair value measurement (Tables)	12 Months Ended
Fair value measurement (Tables)	Dec. 31, 2020
Fair value measurement [Abstract]
Non-financial Assets Measured at Fair Value Classified in Level 3	As of December 31, 2020 and 2019 non-financial assets measured at fair value are classified in Level 3 of this hierarchy, as described below: 2020 2019 Level 3 Vessels $ 182,055 $ 214,938 Buildings 286,232 299,660 Land 1,934,345 1,597,923 $ 2,402,632 $ 2,112,521
Information Used for Appraisal	The information used for the measurement of fair value as of December 31, 2020 was: Offshore vessels Parcel tankers Daily rate or fee 4,504 usd 15,805 usd Average percentage of utilization 78 % 89 % Discount rate 7.44 % 7.65 %
Reconciliation Between Carrying Amounts of Non-financial Assets Classified within Level 3	As of December 31, 2020, and 2019, the reconciliation between the carrying amounts of non-financial assets classified within Level 3 is as follows: Vessels Buildings andFacilities Balance as of January 1, 2020 $ 214,938 $ 1,897,583 Amount recognized in other comprehensive income: Revaluation surplus of vessels - 330,571 Amount recognized in statements profit or loss: Loss on revaluation of vessels (16,136 ) - (16,136 ) 330,571 Additions and disposals, net (16,747 ) (7,577 ) Balance as of December 31, 2020 $ 182,055 $ 2,220,577 Balance as of January 1, 2019 $ 782,673 $ 1,385,153 Amount recognized in other comprehensive income: Revaluation surplus of vessels 41,026 377,593 Amount recognized in statements profit or loss: Loss on revaluation of vessels (39,199 ) - 1,827 377,593 Additions and disposals, net (569,562 ) 134,837 Balance as of December 31, 2019 $ 214 ,938 $ 1,897,583

Financial instruments risk (Tab

Financial instruments risk (Tables)	12 Months Ended
Financial instruments risk (Tables)	Dec. 31, 2020
Financial instruments risk [Abstract]
Monetary Assets and Liabilities Denominated in Foreign Currencies	As of December 31, 2020 and 2019, the Company held monetary assets and liabilities denominated in foreign currencies other than the Mexican peso, translated at the corresponding interbank exchange rate as related to the Mexican peso, as follows: 2020 2019 US dollar Other currencies US dollar Other Assets $ 309,657 $ 932 $ 547,320 $ 1,093 Liabilities (480,253 ) (1,372 ) (1,042,661 ) (1,641 ) $ (170,596 ) $ (440 ) $ (495,341 ) $ (548 )
Sensitivity analysis [Abstract]
Expected Credit Loss for Trade Accounts Receivable	Pursuant to the foregoing, the expected credit loss for trade accounts receivable as of December 31, 2020 and 2019 was determined as follows: Trade accounts receivable days in arrears Current More than 30 days More than 60 days More than Total As of December 31, 2020 Expected credit loss rate 0.0 % 0.0 % 0.0 % 32.7 % - Gross carrying value $ 77,030 $ 5,875 $ 4,290 $ 64,841 $ 152,036 Expected credit losses during the lifetime 21,218 21,218 As of December 31, 2019 Expected credit loss rate 0.0 % 0.0 % 2.3 % 27.4 % - Gross carrying value $ 214,850 $ 18,398 $ 7,976 $ 51,748 $ 292,972 Expected credit losses during the lifetime 185 14,200 14,385
Contractual Maturities of Financial Liabilities	As of December 31, 2020, and 2019, the financial liabilities of Grupo TMM have contractual maturities (including interest payments as applicable) are summarized as follows: Current Non-Current In 6 months 6 to 12 Months 1 to 4 years More than 4 Years At December 31, 2020 Trade payables $ 228,959 $ - $ - $ - Accounts payable and accrued expenses - 525,108 23,522 - Leasing liabilities 29,465 28,780 193,811 103,457 Financial debt 52,125 76,960 48,227 5,417 $ 310,549 $ 630,848 $ 265,560 $ 108,874 Current Non-Current In 6 months 6 to 12 Months 1 to 4 years More than 4 Years At December 31, 2019 Trade payables $ - $ 262,159 $ - $ - Accounts payable and accrued expenses - 499,529 46,742 - Leasing liabilities 34,908 25,670 130,238 396,543 Financial debt 55,139 84,050 113,288 5,449 $ 90,047 $ 871,408 $ 290,268 $ 401,992
Currency Risk [Member]
Sensitivity analysis [Abstract]
Sensitivity Analysis	If the peso had strengthened or weakened against the USD by 11.64% for 2020 and 22.10% for 2019, this would have had the following impact on the monetary position: 2020 2019 11.64% Increase in the exchange rate 11.64% Decrease in the exchange rate 22.10% Increase in the exchange rate 22.10% Decrease in the exchange rate Assets in US dollars $ 36,030 $ (36,030 ) $ 120,944 $ (120,944 ) Assets in other currencies 108 (108 ) 242 (242 ) Liabilities in US dollars (55,880 ) 55,880 (230,401 ) 230,401 Liabilities in other currencies (160 ) 160 (363 ) 363 $ (19,902 ) $ 19,902 $ (109,578 ) $ 109,578
Interest Rate Risks [Member]
Sensitivity analysis [Abstract]
Sensitivity Analysis	The calculations are based on a variance in the average market interest rate for each period and the financial instruments on the reporting date that are sensitive to variances in the interest rates. The rest of the variables remain constant. 2020 2019 +8.24% Variance -8.24% Variance +7.05% Variance -7.05% Variance Profit or loss for the year $ (1,140 ) $ 1,140 $ (1,698 ) $ 1,698

Capital management policies a_2

Capital management policies and procedures (Tables)	12 Months Ended
Capital management policies and procedures (Tables)	Dec. 31, 2020
Capital management policies and procedures [Abstract]
Capital Management Summary	As of December 31, 2020, and 2019, the capital management is summarized as follows: 2020 2019 Stockholders’ equity $ 2,247,408 $ 2,422,792 Cash and cash equivalents (142,982 ) (512,799 ) Stockholders’ equity, net $ 2,104,426 $ 1,909,993 Total financial debt $ 182,729 $ 257,926 Leasing liabilities 355,513 587,359 Overall financing $ 538,242 $ 845,285 Capital-to-overall financing ratio 3.91 2.26

Nature of operations, Principal

Nature of operations, Principal activity (Details) $ in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2019USD ($)	Dec. 31, 2020Ship	Feb. 14, 2019
Expansion and improvement of maritime operations [Abstract]
Increase in minimum capacity of repair services of ships per year \| Ship		30
Expansion of port and terminal operations [Abstract]
States of Central Mexico and Mexico City, Percentage of Gross Domestic Product of Mexico		50.00%
Percentage of minimum gasoline and diesel domestic consumption		70.00%
Percentage of voting equity interests acquired			50.00%
Sierra Oil & Gas [Member]
Expansion of port and terminal operations [Abstract]
Percentage of voting equity interests acquired	50.00%
Consideration paid \| $	$ 2.6
Percentage of ownership	100.00%

Nature of operations, Structure

Nature of operations, Structure of Grupo TMM (Details)	Feb. 14, 2019	Dec. 31, 2020	Dec. 31, 2019
Transportacion Maritima Mexicana, S.A. de C.V. [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%
Inmobiliaria Dos Naciones, S. de R.L. de C.V. [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%
TMM Parcel Tankers, S.A. de C.V. [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%
Almacenadora de Deposito Moderno, S.A. de C.V. [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%
Autotransportacion y Distribucion Logistica, S.A. de C.V. [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%
TMM Almacenadora, S.A.P.I. de C.V. [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%
TMM Logistics, S.A. de C.V. [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%
Prestadora de Servicios MTR, S.A. de C.V. [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%
Bimonte, S.A. de C.V. [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%
Administradora Maritima TMM, S.A.P.I. de C.V. [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%
Caoba Energia, S. de R.L. de C.V. [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%
Services & Solutions Optimus, S. de R.L. de C.V.
Structure of Grupo TMM [abstract]
Percentage of ownership	100.00%	100.00%	100.00%
Servicios Administrativos API Acapulco, S.A. de C.V. [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		51.00%	51.00%
Administracion Portuaria Integral de Acapulco S.A. de C.V. [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		51.00%	51.00%
Mexschiff Operacion de Personal, S.A.P.I. de C.V. [Member] \| Payroll Outsourcing [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%
Omexmar Operadora Mexicana Maritima, S.A.P.I. de C.V. [Member] \| Payroll Outsourcing [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%
Perhafen Services Maritimos, S.A.P.I. de C.V. [Member] \| Payroll Outsourcing [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%
TMM Direccion Corporativa, S.A.P.I. de C.V. [Member] \| Payroll Outsourcing [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%
Perjomar Operadora, S.A.P.I. de C.V. [Member] \| Payroll Outsourcing [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%
Inmobiliaria TMM, S.A. de C.V. [Member] \| Property Leasing [Member]
Structure of Grupo TMM [abstract]
Percentage of ownership		100.00%	100.00%

Nature of operations, Investmen

Nature of operations, Investments in Associates (Details) - MXN ($) $ in Thousands	Jul. 31, 2014	Dec. 31, 2017
TMM DM [Member]
Investments in associates [Abstract]
Proportion of ownership interest in subsidiary		15.00%
Almacenes de Jugos Citricos de Mexico, S.A.P.I. de C.V. [Member]
Investments in associates [Abstract]
Equity method investment	$ 40,000
Percentage of voting shares	21.00%

Summary of significant accoun_4

Summary of significant accounting policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020MXN ($)Segment
Post-employment benefits and benefits for short-term employees [Abstract]
Period of service required for seniority pension entitlement	15 years
Retirement age of employee entitled to seniority pension	60 years
Defined benefits plan, pension plans for certain employees, age of individual	65 years
Information by segments [Abstract]
Number of operating segments \| Segment	4
Leases - determination of the appropriate discount rate to measure lease liabilities [Abstract]
Incremental change in borrowing rate	1.00%
Minimum [Member]
Post-employment benefits and benefits for short-term employees [Abstract]
Age of employee considered early retirement, additional pension plan	55 years
Maximum [Member]
Post-employment benefits and benefits for short-term employees [Abstract]
Age of employee considered early retirement, additional pension plan	60 years
Lease Liability [Member]
Leases - determination of the appropriate discount rate to measure lease liabilities [Abstract]
Effect of incremental change in borrowing rate	$ (7,564)
Properties [Member]
Property, vessels and equipment [Abstract]
Valuation period of properties	P3Y
Vessels [Member] \| Minimum [Member]
Property, vessels and equipment [Abstract]
Period of amortization of repair costs	2 years
Vessels [Member] \| Maximum [Member]
Property, vessels and equipment [Abstract]
Period of amortization of repair costs	5 years
Buildings and Facilities [Member] \| Minimum [Member]
Leased assets [Abstract]
Term of lease	1 year
Buildings and Facilities [Member] \| Maximum [Member]
Leased assets [Abstract]
Term of lease	9 years
Cranes [Member] \| Minimum [Member]
Leased assets [Abstract]
Term of lease	1 year
Cranes [Member] \| Maximum [Member]
Leased assets [Abstract]
Term of lease	2 years
Parcel Vessels and Bulk Carriers [Member] \| Minimum [Member]
Recognition of revenue, costs and expenses, and financing costs [Abstract]
Period revenues derived from transportation of merchandise	7 days
Parcel Vessels and Bulk Carriers [Member] \| Maximum [Member]
Recognition of revenue, costs and expenses, and financing costs [Abstract]
Period revenues derived from transportation of merchandise	30 days
Maritime Administration Services [Member]
Recognition of revenue, costs and expenses, and financing costs [Abstract]
Percentage of profit margin to the costs incurred for services	2.85%
Ship and Container Repair Services [Member] \| Vessels [Member] \| Minimum [Member]
Recognition of revenue, costs and expenses, and financing costs [Abstract]
Period of repair services for ship and containers	2 days
Period of wharfage	1 day
Ship and Container Repair Services [Member] \| Vessels [Member] \| Maximum [Member]
Recognition of revenue, costs and expenses, and financing costs [Abstract]
Period of repair services for ship and containers	60 days
Period of wharfage	365 days
Ship and Container Repair Services [Member] \| Container [Member] \| Minimum [Member]
Recognition of revenue, costs and expenses, and financing costs [Abstract]
Period of repair services for ship and containers	1 day
Ship and Container Repair Services [Member] \| Container [Member] \| Maximum [Member]
Recognition of revenue, costs and expenses, and financing costs [Abstract]
Period of repair services for ship and containers	6 days
Right-of-use Asset [Member]
Leases - determination of the appropriate discount rate to measure lease liabilities [Abstract]
Effect of incremental change in borrowing rate	$ (7,564)

Acquisitions and disposals, 202

Acquisitions and disposals, 2020 (Details) $ in Thousands	12 Months Ended
Acquisitions and disposals, 2020 (Details) $ in Thousands	Dec. 31, 2020MXN ($)Company	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disposal of subsidiaries [Abstract]
Percentage of voting interest sold in subsidiaries		100.00%
Gain on disposition of subsidiaries \| $	$ 451	$ 279,744	$ 111,484
Number of entities acquired \| Company	0
Siremirta Corporate, S.A. de C.V [Member]
Disposal of subsidiaries [Abstract]
Percentage of voting interest sold in subsidiaries	100.00%
Ricalme Services, S.A. de C.V [Member]
Disposal of subsidiaries [Abstract]
Percentage of voting interest sold in subsidiaries	100.00%
Dogoubert, S.A.P.I. de C.V. [Member]
Disposal of subsidiaries [Abstract]
Percentage of voting interest sold in subsidiaries	100.00%
Judsony, S.A.P.I. de C.V. [Member]
Disposal of subsidiaries [Abstract]
Percentage of voting interest sold in subsidiaries	100.00%

Acquisitions and disposals, 201

Acquisitions and disposals, 2019 (Details) - MXN ($) $ in Thousands	Feb. 14, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disposal of subsidiaries [Abstract]
Percentage of voting interest sold in subsidiaries			100.00%
Current assets [Abstract]
Other accounts receivable			$ 27,786
Other current assets			5,388
Total current assets			33,174
Non-current assets [Abstract]
Property			339,038
Total assets			372,212
Short-term liabilities [Abstract]
Other accounts payable			25,243
Total short-term liabilities			25,243
Long-term liabilities [Abstract]
Deferred income tax			58,920
Total liabilities			84,163
Total net assets			288,049
Consideration transferred			567,793
Gain on the disposition of subsidiaries		$ 451	279,744	$ 111,484
Acquisition of subsidiaries [Abstract]
Percentage of remaining capital stock acquired	50.00%
Snekke, S.A. de C.V. [Member]
Current assets [Abstract]
Other accounts receivable			27,786
Other current assets			5,388
Total current assets			33,174
Non-current assets [Abstract]
Property			339,038
Total assets			372,212
Short-term liabilities [Abstract]
Other accounts payable			25,243
Total short-term liabilities			25,243
Long-term liabilities [Abstract]
Deferred income tax			58,920
Total liabilities			84,163
Total net assets			288,049
Consideration transferred			543,184
Gain on the disposition of subsidiaries			$ 255,135
Bamorau Servicios, S.A.P.I. de C.V. [Member]
Disposal of subsidiaries [Abstract]
Percentage of voting interest sold in subsidiaries			100.00%
Current assets [Abstract]
Other accounts receivable			$ 0
Other current assets			0
Total current assets			0
Non-current assets [Abstract]
Property			0
Total assets			0
Short-term liabilities [Abstract]
Other accounts payable			0
Total short-term liabilities			0
Long-term liabilities [Abstract]
Deferred income tax			0
Total liabilities			0
Total net assets			0
Consideration transferred			24,609
Gain on the disposition of subsidiaries			$ 24,609
Services & Solutions Optimus, S. de R.L. de C.V.
Acquisition of subsidiaries [Abstract]
Proportion of ownership interest in subsidiary	100.00%	100.00%	100.00%
Amounts recognized as of acquisition date for each major class of assets acquired and liabilities assumed [Abstract]
Fair value of the consideration transferred	$ 51,126
Recognized amounts of identifiable net assets [Abstract]
Cash and cash equivalents	671
Other current assets	8,703
Land	122,481
Construction in progress	23,595
Total identifiable assets	155,450
Accounts payable	113,777
Other liabilities	373
Total liabilities assumed	114,150
Identifiable net assets	41,300
Goodwill on acquisition	9,826
Consideration transferred settled in cash	51,126
Cash and cash equivalents acquired receive on acquisition	(671)
Net cash outflow on acquisition	$ 50,455

Acquisitions and disposals, 2_2

Acquisitions and disposals, 2018 (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disposal of subsidiaries [Abstract]
Percentage of voting interest sold in subsidiaries		100.00%
Gain on disposition of subsidiaries	$ 451	$ 279,744	$ 111,484
Impact Engine, S.A. de C.V. [Member]
Disposal of subsidiaries [Abstract]
Percentage of voting interest sold in subsidiaries			100.00%
Talocaan Services, S.A. de C.V. [Member]
Disposal of subsidiaries [Abstract]
Percentage of voting interest sold in subsidiaries			100.00%
Ditermax Corporate, S.A. de C.V. [Member]
Disposal of subsidiaries [Abstract]
Percentage of voting interest sold in subsidiaries			100.00%

Cash and cash equivalents (Deta

Cash and cash equivalents (Details) - MXN ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents [Abstract]
Cash on hand		$ 756	$ 902
Cash at banks		49,356	126,972
Short-term investments	[1]	55,198	348,840
Total cash and cash equivalents		$ 105,310	476,714	$ 278,842	$ 422,083
Maximum period for fix-term deposits (promissory notes) and repurchase/resell agreement		3 days
Restricted cash [Abstract]
Restricted cash		$ 37,672	$ 36,085

[1]	Includes fix-term deposits (promissory notes) and repurchase/resell agreements with terms up to 3 days.

Trade receivables (Details)

Trade receivables (Details) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Trade receivables [Abstract]
Total trade receivables	$ 151,366	$ 292,972
Contract assets	56,215	65,443
Allowance for doubtful accounts	(21,218)	(14,385)	$ (22,303)
Trade receivables, net	186,363	344,030
Shipyards [Member]
Trade receivables [Abstract]
Total trade receivables	40,979	34,325
Tugboats [Member]
Trade receivables [Abstract]
Total trade receivables	13,981	19,406
Parcel Tankers [Member]
Trade receivables [Abstract]
Total trade receivables	14,485	18,217
Offshore Vessels [Member]
Trade receivables [Abstract]
Total trade receivables	29,864	4,737
Bulk Carrier [Member]
Trade receivables [Abstract]
Total trade receivables	98	906
Others [Member]
Trade receivables [Abstract]
Total trade receivables	0	173
Shipping Agencies [Member]
Trade receivables [Abstract]
Total trade receivables	331	128,300
Port Services [Member]
Trade receivables [Abstract]
Total trade receivables	7,152	10,732
Commercial Leases [Member]
Trade receivables [Abstract]
Total trade receivables	106	93
Warehousing [Member]
Trade receivables [Abstract]
Total trade receivables	27,145	44,820
Repair of Containers [Member]
Trade receivables [Abstract]
Total trade receivables	16,204	28,986
Automotive Services [Member]
Trade receivables [Abstract]
Total trade receivables	1,021	1,112
Other Businesses [Member]
Trade receivables [Abstract]
Total trade receivables	$ 0	$ 1,165

Trade receivables, Movement in

Trade receivables, Movement in Allowance for Doubtful Accounts (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Trade receivables [Abstract]
Beginning balance	$ 14,385	$ 22,303
Impairment loss for the period	20,140	0
Receivables written off during the year	0	(1,847)
Allowance cancelation recognized during the year	(13,307)	(6,071)
Ending balance	$ 21,218	$ 14,385

Other accounts receivable (Deta

Other accounts receivable (Details) - MXN ($) $ in Thousands	Dec. 31, 2020		Dec. 31, 2019
Current [Abstract]
Recoverable taxes	$ 203,503		$ 306,327
Services for port, maritime and other operations	54,288		93,692
Employees	4,495		4,698
Insurance claims	818		773
Others	1,157		16,280
Other accounts receivable	264,261		421,770
Non-current [Abstract]
Value added tax recoverable	238,000	[1]	0
Other accounts receivable	$ 502,261		$ 421,770

[1]	During the 2020, the VAT recovery processes have been affected by practices of the tax authorities to extend the recovery periods.

Property, vessels and equipme_3

Property, vessels and equipment, Summary (Details) - MXN ($) $ in Thousands	Aug. 30, 2019	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at beginning of year		$ 2,285,420		$ 2,313,437
Additions		28,375		48,281
Disposals		32,265		213,038
Transfers and others		304,074		198,205
Depreciation/loss from revaluation		53,608		61,465
Net balances at year end		2,531,996		2,285,420		$ 2,313,437
Proceeds from sale of vessel		614		16,233		169,627
Gain on sale of vessel		153		23,415		(1,849)
Revaluation surplus		1,455,179		1,140,744
Accumulated Depreciation and Amortization [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Accumulated depreciation		290,056		261,862
Vessels [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at beginning of year		214,938		782,673
Additions		0		0
Disposals		0		200,119	[1],[2]
Transfers and others		(16,241)	[3]	(337,211)	[4]
Depreciation/loss from revaluation		16,642		30,405
Net balances at year end		$ 182,055		$ 214,938		782,673
Estimated useful lives (years)		25 years		25 years
Deficit from revaluation		$ 16,135
Proceeds from sale of vessel	$ 15,703
Gain on sale of vessel	$ 4,410
Loss in fair value				$ 191,377		206,076
Shipyard [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at beginning of year		232		275
Additions		0		0
Disposals		0		0
Transfers and others		0		0
Depreciation/loss from revaluation		42		43
Net balances at year end		$ 190		$ 232		275
Estimated useful lives (years)		40 years		40 years
Major Vessel Maintenance [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at beginning of year		$ 15,180		$ 41,611
Additions		0		1,753
Disposals		0		12,317
Transfers and others		5,871		(1,979)
Depreciation/loss from revaluation		14,193		13,888
Net balances at year end		$ 6,858		$ 15,180		41,611
Estimated useful lives (years)		2 years 6 months		2 years 6 months
Buildings and Facilities [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at beginning of year		$ 299,660		$ 238,901
Additions		3,432		4,891
Disposals		0		0
Transfers and others		0		67,484	[5]
Depreciation/loss from revaluation		16,860		11,616
Net balances at year end		$ 286,232		299,660		238,901
Revaluation surplus				$ 66,518
Buildings and Facilities [Member] \| Minimum [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Estimated useful lives (years)		20 years		20 years
Buildings and Facilities [Member] \| Maximum [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Estimated useful lives (years)		25 years		25 years
Warehousing Equipment [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at beginning of year		$ 205		$ 255
Additions		616		419
Disposals		0		0
Transfers and others		0		0
Depreciation/loss from revaluation		371		469
Net balances at year end		$ 450		$ 205		255
Estimated useful lives (years)		10 years		10 years
Computer Equipment [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at beginning of year		$ 456		$ 581
Additions		214		249
Disposals		0		0
Transfers and others		0		0
Depreciation/loss from revaluation		273		374
Net balances at year end		$ 397		$ 456		581
Computer Equipment [Member] \| Minimum [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Estimated useful lives (years)		3 years		3 years
Computer Equipment [Member] \| Maximum [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Estimated useful lives (years)		4 years		4 years
Terminal Equipment [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at beginning of year		$ 26,035		$ 7,390
Additions		999		280
Disposals		281		0
Transfers and others		0		20,345
Depreciation/loss from revaluation		2,444		1,980
Net balances at year end		$ 24,309		$ 26,035		7,390
Estimated useful lives (years)		10 years		10 years
Ground Transportation Equipment [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at beginning of year		$ 5,027		$ 5,366
Additions		79		1,621
Disposals		0		602
Transfers and others		28		36
Depreciation/loss from revaluation		1,404		1,394
Net balances at year end		$ 3,730		$ 5,027		5,366
Ground Transportation Equipment [Member] \| Minimum [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Estimated useful lives (years)		4 years 6 months		4 years 6 months
Ground Transportation Equipment [Member] \| Maximum [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Estimated useful lives (years)		10 years		10 years
Other Equipment [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at beginning of year		$ 10,892		$ 7,079
Additions		166		446
Disposals		180		0
Transfers and others		1		4,663
Depreciation/loss from revaluation		1,379		1,296
Net balances at year end		9,500		10,892		7,079
Total Property, Vessels and Equipment, Excluding Land and Construction in Progress [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at beginning of year		572,625		1,084,131
Additions		5,506		9,659
Disposals		461		213,038
Transfers and others		(10,341)		(246,662)
Depreciation/loss from revaluation		53,608		61,465
Net balances at year end		513,721		572,625		1,084,131
Lands [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at beginning of year		1,597,923		1,146,252
Additions		0		0
Disposals		0		0
Transfers and others		336,422	[3]	451,671	[5]
Depreciation/loss from revaluation		0		0
Net balances at year end		1,934,345		1,597,923		1,146,252
Revaluation surplus		330,571		310,883
Constructions in Progress [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Net balances at beginning of year		114,872		83,054
Additions		22,869		38,622	[6]
Disposals		31,804	[7]	0
Transfers and others		(22,007)		(6,804)
Net balances at year end		$ 83,930		114,872		$ 83,054
TMM DM [Member] \| Vessels [Member]
Reconciliation of changes in property, vessels and equipment [Abstract]
Proceeds from sale of vessel				339,038
Revaluation surplus				$ 1,827

[1]	During 2018, the offshore vessel 'Subsea 88' suffered a major mishap in one of its areas and for which it stopped operating. As of December 31, 2018, Grupo TMM was making the corresponding insurance claims without a final settlement having been issued on the mishap as of that date. Since the repair of the ship requires a substantial time that affects future cash flows, Management recognized a loss in fair value in the amount of $206,076.
[2]	On August 30, 2019, the sale of the vessel SMR Manzanillo to Bricor Servicios Portuarios Mexicanos, S.A. de C.V. by Transportacion Maritima Mexicana, S.A. de C.V., a subsidiary of Grupo TMM, was complete for an amount of $15,703, generating a profit of $ 4,410.
[3]	It is mainly comprised of the surplus for revaluation of land for $ 330,571 and a deficit for revaluation of vessels for $ 16,135.
[4]	It is comprised mainly of disposal of the TMM Colima vessel in the divestiture of Snekke, S.A. de C.V. of Grupo TMM for $339,038, which is partially offset by the revaluation surplus of $1,827.
[5]	Includes the surplus for revaluation of lands and properties for $310,833 and $66,518, respectively.
[6]	Corresponds to the construction of infrastructure for various projects related to the storage and transportation of hydrocarbons and refined petroleum products.
[7]	Corresponds mainly to the cancellation of the project called "Terminal Quintana Roo", derived from changes in the conditions of the project previously considered by Management.

Property, vessels and equipme_4

Property, vessels and equipment, Cost model (Details) $ in Thousands	Dec. 31, 2020MXN ($)Vessel	Dec. 31, 2019MXN ($)Vessel
Property, vessels and equipment, cost model [Abstract]
Revalued carrying amounts	$ 958,969	$ 971,777
Revaluation surplus, before taxes	1,455,179	1,140,744
Vessels [Member]
Property, vessels and equipment, cost model [Abstract]
Revalued carrying amounts	$ 102,993	$ 108,414
Vessels [Member] \| Various Bank Loans [Member]
Guarantees [Abstract]
Number of vessels pledged as security \| Vessel	3	2
Lands [Member]
Property, vessels and equipment, cost model [Abstract]
Revalued carrying amounts	$ 715,616	$ 715,616
Revaluation surplus, before taxes	330,571	310,883
Properties [Member]
Property, vessels and equipment, cost model [Abstract]
Revalued carrying amounts	$ 140,360	147,747
Revaluation surplus, before taxes		$ 66,518

Leases, Right-of-use assets (De

Leases, Right-of-use assets (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Right-of-use assets [Abstract]
Balance, beginning of period	$ 560,099
Balance, end of period	354,232		$ 560,099
Monthly payment of lease	90,432		134,245	$ 0
Warehouse [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	43,756
Balance, end of period	204,605		43,756
Cranes [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	915
Balance, end of period	4,565		915
Courtyards [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	49,241
Balance, end of period	37,540		49,241
Major Vessel Maintenance [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	2,167
Balance, end of period	17,985		2,167
Corporate Building [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	464,020
Balance, end of period	89,537		464,020
Expenses related to cancellation of lease	113,469
Monthly payment of lease	$ 158
Lease payment period	4 years
Gross carrying amount [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	$ 671,684		0
Additions	339,463		671,684
Disposals	537,444		0
Balance, end of period	473,703		671,684	0
Gross carrying amount [Member] \| Warehouse [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	83,968		0
Additions	216,548		83,968
Disposals	12,875		0
Balance, end of period	287,641		83,968	0
Gross carrying amount [Member] \| Cranes [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	3,112		0
Additions	8,610		3,112
Disposals	0		0
Balance, end of period	11,722		3,112	0
Gross carrying amount [Member] \| Courtyards [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	60,035		0
Additions	0		60,035
Disposals	0		0
Balance, end of period	60,035		60,035	0
Gross carrying amount [Member] \| Major Vessel Maintenance [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	10,834		0
Additions	22,135		10,834
Disposals	10,834		0
Balance, end of period	22,135		10,834	0
Gross carrying amount [Member] \| Corporate Building [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	513,735		0
Additions	92,170		513,735
Disposals	513,735	[1]	0
Balance, end of period	92,170		513,735	0
Depreciation [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	(111,585)		0
Disposals	74,864		0
Depreciation	82,750		111,585
Balance, end of period	(119,471)		(111,585)	0
Depreciation [Member] \| Warehouse [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	(40,212)		0
Disposals	1,884		0
Depreciation	44,708		40,212
Balance, end of period	(83,036)		(40,212)	0
Depreciation [Member] \| Cranes [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	(2,197)		0
Disposals	0		0
Depreciation	4,960		2,197
Balance, end of period	(7,157)		(2,197)	0
Depreciation [Member] \| Courtyards [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	(10,794)		0
Disposals	0		0
Depreciation	11,701		10,794
Balance, end of period	(22,495)		(10,794)	0
Depreciation [Member] \| Major Vessel Maintenance [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	(8,667)		0
Disposals	10,834		0
Depreciation	6,317		8,667
Balance, end of period	(4,150)		(8,667)	0
Depreciation [Member] \| Corporate Building [Member]
Right-of-use assets [Abstract]
Balance, beginning of period	(49,715)		0
Disposals	62,146		0
Depreciation	15,064		49,715
Balance, end of period	$ (2,633)		$ (49,715)	$ 0

[1]	It corresponds to the cancellation of the rental agreement of the former corporate headquarters located on Av. De la Cuspide, which generates an effect on profit or loss in the amount of $113,469, which is presented in the caption of other (expenses) income (See note 19). In accordance with the agreement, the Company is bound to pay an amount of 158 thousand dollars monthly for 4 years, which will be conditioned to the rent or sale by the lessor of the real property.

Leases, Information on Leases (

Leases, Information on Leases (Details) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Information on leases [Abstract]
Short-term	$ 58,245	$ 60,578
Long-term	297,268	526,781
Warehouse [Member] \| Payable in Mexican Pesos [Member]
Information on leases [Abstract]
Short-term	33,916	32,673
Long-term	174,894	14,094
Cranes [Member] \| Payable in Mexican Pesos [Member]
Information on leases [Abstract]
Short-term	4,272	963
Long-term	488	0
Courtyards [Member] \| Payable in Mexican Pesos [Member]
Information on leases [Abstract]
Short-term	8,260	10,285
Long-term	33,030	41,248
Major Vessel Maintenance [Member] \| Payable in Mexican Pesos [Member]
Information on leases [Abstract]
Short-term	6,490	2,269
Long-term	13,214	0
Corporate Building [Member] \| Payable in US Dollars [Member]
Information on leases [Abstract]
Short-term	5,307	14,388
Long-term	$ 75,642	$ 471,439

Leases, Leasing activities by t

Leases, Leasing activities by type of Right-of-use asset (Details)	12 Months Ended
	Dec. 31, 2020AssetLease
Corporate Building [Member]
Leasing activities by type of right-of-use asset [Abstract]
No. of right-of-use assets leased \| Asset	1
Range of remaining term (years)	8 years
No. of leases with extension options	0
No. of leases with purchase option	0
No. of leases with variable payments linked to an index	1
No. of leases with termination options	0
Warehouse [Member]
Leasing activities by type of right-of-use asset [Abstract]
No. of right-of-use assets leased \| Asset	6
No. of leases with extension options	2
No. of leases with purchase option	0
No. of leases with variable payments linked to an index	6
No. of leases with termination options	0
Warehouse [Member] \| Minimum [Member]
Leasing activities by type of right-of-use asset [Abstract]
Range of remaining term (years)	1 year
Warehouse [Member] \| Maximum [Member]
Leasing activities by type of right-of-use asset [Abstract]
Range of remaining term (years)	5 years
Courtyards [Member]
Leasing activities by type of right-of-use asset [Abstract]
No. of right-of-use assets leased \| Asset	5
No. of leases with extension options	5
No. of leases with purchase option	0
No. of leases with variable payments linked to an index	5
No. of leases with termination options	0
Courtyards [Member] \| Minimum [Member]
Leasing activities by type of right-of-use asset [Abstract]
Range of remaining term (years)	1 year
Courtyards [Member] \| Maximum [Member]
Leasing activities by type of right-of-use asset [Abstract]
Range of remaining term (years)	6 years
Cranes [Member]
Leasing activities by type of right-of-use asset [Abstract]
No. of right-of-use assets leased \| Asset	1
Range of remaining term (years)	2 years
No. of leases with extension options	0
No. of leases with purchase option	0
No. of leases with variable payments linked to an index	0
No. of leases with termination options	0
Major Vessel Maintenance [Member]
Leasing activities by type of right-of-use asset [Abstract]
No. of right-of-use assets leased \| Asset	1
Range of remaining term (years)	4 years
No. of leases with extension options	0
No. of leases with purchase option	0
No. of leases with variable payments linked to an index	0
No. of leases with termination options	0

Leases, Lease payments (Details

Leases, Lease payments (Details) - MXN ($) $ in Thousands		12 Months Ended
Leases, Lease payments (Details) - MXN ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Future minimum lease payments [Abstract]
Lease payments		$ 481,128	$ 932,955
Financial charges		(125,615)	(345,596)
Present values, net		355,513	587,359
Expense relating to payments not included in the measurement of the lease liability [Abstract]
Short-term leases	[1]	307,643	296,770
Leases of low value assets		4,820	3,696
Expense relating to payments not included in the measurement of the lease liability		312,463	300,466
Committed on short-term leases and total commitment		95,914
Lease commitments that had not yet started		0
Cash outflow for leases		402,892	434,710
Within the 1st Year [Member]
Future minimum lease payments [Abstract]
Lease payments		95,914	121,847
Financial charges		(37,669)	(61,269)
Present values, net		58,245	60,578
1 to 3 Years [Member]
Future minimum lease payments [Abstract]
Lease payments		178,415	185,494
Financial charges		(55,149)	(108,101)
Present values, net		123,266	77,393
3 to 5 Years [Member]
Future minimum lease payments [Abstract]
Lease payments		152,179	198,259
Financial charges		(23,783)	(87,429)
Present values, net		128,396	110,830
After 5 Years [Member]
Future minimum lease payments [Abstract]
Lease payments		54,620	427,355
Financial charges		(9,014)	(88,797)
Present values, net		$ 45,606	$ 338,558

[1]	Corresponds to the leasing of parcel and bulk carrier vessels.

Concession rights (Details)

Concession rights (Details) - MXN ($) $ in Thousands		12 Months Ended
Concession rights (Details) - MXN ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Concession rights [Abstract]
Concessional rights		$ 151,250	$ 141,484	$ 126,437
Amortization expense		742	4,001
Concession Rights [Member]
Concession rights [Abstract]
Concessional rights		1,892	5,676
Accumulated amortization		(92,715)	(88,931)
Amortization expense		$ 3,784	3,784
Concession Rights [Member] \| Administracion Portuaria Integral de Acapulco [Member]
Concession rights [Abstract]
Years to amortize	[1]	10 years
Monthly payments		$ 7,507	7,536
Concession Rights [Member] \| Transportacion Maritima Mexicana [Member]
Concession rights [Abstract]
Concessional rights	[2]		30,266
Years to amortize	[2]	0 years
Concessional arrangement, rights renewal period		8 years
Concession Rights [Member] \| Gross [Member]
Concession rights [Abstract]
Concessional rights		$ 94,607	94,607
Concession Rights [Member] \| Gross [Member] \| Administracion Portuaria Integral de Acapulco [Member]
Concession rights [Abstract]
Concessional rights	[1]	94,607	94,607
Concession Rights [Member] \| Gross [Member] \| Transportacion Maritima Mexicana [Member]
Concession rights [Abstract]
Concessional rights	[2]	$ 0	$ 0

[1]	As of December 31, 2020 and 2019, the Company holds concession to operate the cruise and vehicle terminal at the port of Acapulco, Guerrero. Under this concession agreements, the Company is obliged to keep the facilities included in the concession in good condition, as well as making monthly payments (fixed and variable), related to the operation (see Note 28).
[2]	As of December 31, 2018, the Company maintained the concession rights to operate the tug services in the Port of Manzanillo, Colima. This concession was renewed in October 2014, expiring on January 16, 2023, with the possibility of being renewed for another eight years.

Intangible assets (Details)

Intangible assets (Details) - MXN ($) $ in Thousands		12 Months Ended
Intangible assets (Details) - MXN ($) $ in Thousands		Dec. 31, 2020		Dec. 31, 2019
Summary of intangible assets [Abstract]
Net balances at beginning of year		$ 141,484		$ 126,437
Additions		10,508		19,048
Transfers and others		0		0
Amortization		742		4,001
Net balances at year end		151,250		141,484
Software [Member]
Summary of intangible assets [Abstract]
Net balances at beginning of year		15,956		909
Additions		10,508	[1]	19,048
Transfers and others		0		0
Amortization		742		4,001
Net balances at year end		$ 25,722		$ 15,956
Software [Member] \| Minimum [Member]
Summary of intangible assets [Abstract]
Estimated useful life (years)		3 years		3 years
Software [Member] \| Maximum [Member]
Summary of intangible assets [Abstract]
Estimated useful life (years)		5 years		5 years
Software [Member] \| Accumulated Amortization [Member]
Summary of intangible assets [Abstract]
Accumulated amortization		$ 3,850		$ 7,096
Trademark [Member]
Summary of intangible assets [Abstract]
Net balances at year start	[2]	125,528		125,528
Additions	[2]	0		0
Transfers and others	[2]	0		0
Net balances at year end	[2]	$ 125,528		$ 125,528

[1]	Corresponds mainly to the SAP Hana system upgrade project.
[2]	Corresponds to the rights on the Marmex trademark associated with the specialized maritime division segment, specifically the offshore vessels operation. This trademark is subject to annual impairment testing (see Note 13).

Impairment of long-lived asse_3

Impairment of long-lived assets (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Assets or cash-generating units [Member]
Impairment of long-lived assets [Abstract]
Projection period, calculation of recoverable amounts	P3Y
Increase to discount rate used	1.00%
Decrease in cash-generating unit value	4.91%
Vessels and Trademark [Member]
Impairment of long-lived assets [Abstract]
Impairment loss	$ 0	$ 0
Properties [Member]
Impairment of long-lived assets [Abstract]
Impairment loss	0	0
Corporate Assets and Other Long-lived Assets [Member]
Impairment of long-lived assets [Abstract]
Impairment loss	$ 0	$ 0
Vessels [Member]
Impairment of long-lived assets [Abstract]
Growth rate	2.00%	2.00%
Discount rate	7.45%	7.19%

Financial assets and liabilit_3

Financial assets and liabilities, Categories of financial assets and liabilities (Details) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financial assets [Abstract]
Cash and cash equivalents	$ 105,310	$ 476,714	$ 278,842	$ 422,083
Restricted cash	37,672	36,085
Trade receivables	186,363	344,030
Other accounts receivable	264,261	421,770
Related parties	42,228	163,344
Financial liabilities [Abstract]
Short-term portion of the financial debt	129,085	139,189
Trade payables	228,959	262,159
Accounts payable and accrued expenses	525,108	499,529
Related parties	1,458	87,573
Long-term financial debt	53,644	118,737
Financial Liabilities Valued at Amortized Cost [Member]
Financial liabilities [Abstract]
Short-term portion of the financial debt	129,085	139,189
Trade payables	228,959	262,159
Accounts payable and accrued expenses	486,827	461,892
Related parties	1,458	87,573
Total short-term portion of the financial debt	846,329	950,813
Long-term financial debt	53,644	118,737
Total financial liabilities	899,973	1,069,550
Financial Assets Valued at Amortized Cost [Member]
Financial assets [Abstract]
Cash and cash equivalents	105,310	476,714
Restricted cash	37,672	36,085
Trade receivables	130,148	278,587
Other accounts receivable	60,758	115,443
Related parties	42,228	163,344
Total current financial assets	$ 376,116	$ 1,070,173

Financial assets and liabilit_4

Financial assets and liabilities, Other Financing (Details) $ in Thousands, $ in Thousands

Dec. 20, 2019USD ($)

Jan. 31, 2017USD ($)

Jul. 31, 2019USD ($)

Jul. 31, 2018USD ($)

Dec. 31, 2020MXN ($)ExtensionOption

Dec. 31, 2019MXN ($)

Dec. 31, 2018MXN ($)

Jul. 31, 2020MXN ($)

Nov. 26, 2018MXN ($)

Oct. 11, 2018MXN ($)

Sep. 30, 2018MXN ($)

Jul. 31, 2018MXN ($)

Jul. 31, 2017MXN ($)

Dec. 31, 2016MXN ($)

Other Financing [Abstract]

Short-term

$ 129,085

$ 139,189

Long-term

53,644

118,737

Debt amount

$ 182,729

257,926

Basis points

1.00%

Payment on debt

$ 123,703

189,026

$ 397,458

Daimler Financial Services Mexico, S. de R.L. de C.V. [Member]

Other Financing [Abstract]

Short-term

16,333

9,504

Long-term

9,074

Daimler Financial Services Mexico, S. de R.L. de C.V. [Member] | Debt Obligation - 1 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 40,900

Interest rate

12.00%

Maturity date

November 2019

Daimler Financial Services Mexico, S. de R.L. de C.V. [Member] | Debt Obligation - 2 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 28,000

Interest rate

12.90%

Maturity date

October 2021

Daimler Financial Services Mexico, S. de R.L. de C.V. [Member] | Debt Obligation - 2 [Member] | Fixed Rate [Member] | Covid-19 [Member]

Other Financing [Abstract]

Maturity date

January 2022

Grace period

3 months

Number of grace period options | ExtensionOption

Banco Autofin Mexico, S.A. Institucion de Banca Multiple [Member]

Other Financing [Abstract]

Short-term

$ 23,352

23,319

Long-term

12,773

28,477

Banco Autofin Mexico, S.A. Institucion de Banca Multiple [Member] | Line of Credit - 1 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 45,800

Variable rate basis

28-day TIIE

Basis points

4.50%

Maturity date

September 2021

Banco Autofin Mexico, S.A. Institucion de Banca Multiple [Member] | Line of Credit - 2 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 34,600

Variable rate basis

28-day TIIE

Basis points

4.50%

Maturity date

September 2021

Banco Autofin Mexico, S.A. Institucion de Banca Multiple [Member] | Line of Credit - 3 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 25,500

Variable rate basis

28-day TIIE

Basis points

4.50%

Maturity date

September 2021

Banco Autofin Mexico, S.A. Institucion de Banca Multiple [Member] | Line of Credit - 4 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 21,600

Variable rate basis

28-day TIIE

Basis points

4.50%

Maturity date

September 2021

Banco Autofin Mexico, S.A. Institucion de Banca Multiple [Member] | Line of Credit - 5 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 8,400

Variable rate basis

28-day TIIE

Basis points

4.50%

Maturity date

September 2021

Banco Autofin Mexico, S.A. Institucion de Banca Multiple [Member] | Line of Credit - 6 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 20,000

Variable rate basis

28-day EIIR

Basis points

5.50%

Maturity date

November 2023

Banco Autofin Mexico, S.A. Institucion de Banca Multiple [Member] | Line of Credit - 6 [Member] | Variable Rate [Member] | Covid-19 [Member]

Other Financing [Abstract]

Grace period

6 months

INPIASA, S.A. de C.V. [Member]

Other Financing [Abstract]

Short-term

[1]

$ 1,435

1,566

Long-term

[1]

1,044

INPIASA, S.A. de C.V. [Member] | Line of Credit - 1 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 15,700

Variable rate basis

28-day TIIE

Basis points

4.50%

Maturity date

August 2021

HSBC, S.A. [Member]

Other Financing [Abstract]

Short-term

[1]

$ 951

1,629

Long-term

[1]

543

HSBC, S.A. [Member] | Line of Credit - 1 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 9,770

Variable rate basis

28-day TIIE

Basis points

3.00%

Maturity date

April 2021

HSBC, S.A. [Member] | Line of Credit - 1 [Member] | Variable Rate [Member] | Covid-19 [Member]

Other Financing [Abstract]

Grace period

3 months

Banco del Bajio, S.A. Intemza [Member]

Other Financing [Abstract]

Short-term

[1]

$ 211

842

Long-term

[1]

Banco del Bajio, S.A. Intemza [Member] | Line of Credit - 1 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 9,360

Variable rate basis

28-day TIIE

Basis points

2.50%

Maturity date

August 2020

CI Banco S.A. Institucion de Banca Multiple [Member]

Other Financing [Abstract]

Short-term

[1]

$ 0

23,227

Long-term

[1]

Banco del Bajio, S.A. [Member]

Other Financing [Abstract]

Short-term

1,714

Long-term

9,571

Banco del Bajio, S.A. [Member] | Line of Credit - 2 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 24,000

Variable rate basis

28-day TIIE

Basis points

6.00%

Maturity date

March 2020

Banco del Bajio, S.A. [Member] | Line of Credit - 3 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 12,000

Mortgage guarantee

$ 30,000

Variable rate basis

28-day TIIE

Basis points

6.00%

Maturity date

July 2027

Banco del Bajio, S.A. [Member] | Line of Credit - 3 [Member] | Variable Rate [Member] | Covid-19 [Member]

Other Financing [Abstract]

Grace period

6 months

Portafolio de Negocios, S.A. de C.V. SOFOM [Member]

Other Financing [Abstract]

Short-term

$ 2,738

Long-term

6,334

Portafolio de Negocios, S.A. de C.V. SOFOM [Member] | Line of Credit - 1 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 10,000

Interest rate

15.00%

Maturity date

July 2023

Other Investors [Member]

Other Financing [Abstract]

Short-term

$ 12,000

Long-term

Other Investors [Member] | Line of Credit - 1 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 6,000

Interest rate

15.00%

Maturity date

October 2020

Other Investors [Member] | Line of Credit - 2 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 6,000

Interest rate

15.00%

Maturity date

October 2020

ACT Maritime, LLC [Member]

Other Financing [Abstract]

Short-term

$ 0

15,843

Long-term

$ 0

57,349

ACT Maritime, LLC [Member] | Line of Credit - 1 [Member] | Variable Rate [Member]

Other Financing [Abstract]

Debt amount

$ 5,520

Variable rate basis

Libor rate at 90 days

Basis points

7.50%

Maturity date

September 2023

Term of debt

5 years

Others [Member]

Other Financing [Abstract]

Short-term

$ 59,806

56,618

Long-term

$ 0

Others [Member] | Unsecured Loan - 1 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 3,000

Interest rate

11.25%

Maturity date

July 2017

Others [Member] | Unsecured Loan - 2 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 3,000

Interest rate

11.25%

Maturity date

July 2017

Others [Member] | Unsecured Loans [Member]

Other Financing [Abstract]

Payment on debt

$ 1,000

Others [Member] | Unsecured Loans [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 5,000

Interest rate

11.25%

Maturity date

July 2018

Payment on debt

$ 1,000

$ 4,000

$ 500

Others [Member] | Unsecured Loans Rescheduled [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 4,500

Interest rate

11.25%

Maturity date

July 2019

Others [Member] | Unsecured Loans Rescheduled - 2 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 3,000

Interest rate

11.25%

Maturity date

July 2021

Hewlett Packard [Member]

Other Financing [Abstract]

Short-term

$ 4,180

2,354

Long-term

14,679

9,263

Hewlett Packard [Member] | Line of Credit - 1 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 607,800

Interest rate

6.84%

Maturity date

March 2024

Hewlett Packard [Member] | Line of Credit - 1 [Member] | Fixed Rate [Member] | Covid-19 [Member]

Other Financing [Abstract]

Grace period

3 months

Hewlett Packard [Member] | Line of Credit - 2 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 201,600

Interest rate

6.13%

Maturity date

October 2024

Hewlett Packard [Member] | Line of Credit - 2 [Member] | Fixed Rate [Member] | Covid-19 [Member]

Other Financing [Abstract]

Grace period

3 months

Hewlett Packard [Member] | Line of Credit - 3 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 86,600

Interest rate

5.96%

Maturity date

March 2025

Hewlett Packard [Member] | Line of Credit - 4 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 96,900

Interest rate

7.16%

Maturity date

April 2025

Hewlett Packard [Member] | Line of Credit - 5 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 252,100

Interest rate

4.58%

Maturity date

August 2025

PNC, Bank, N.A. [Member]

Other Financing [Abstract]

Short-term

$ 3,429

3,246

Long-term

10,287

12,987

PNC, Bank, N.A. [Member] | Line of Credit - 1 [Member] | Fixed Rate [Member]

Other Financing [Abstract]

Debt amount

$ 860,000

Interest rate

4.40%

Maturity date

July 2024

Payable in Mexican Pesos [Member]

Other Financing [Abstract]

Short-term

$ 59,297

60,497

Long-term

28,678

39,138

Short-term interest payable

563

410

Long-term interest payable

Payable in US Dollars [Member]

Other Financing [Abstract]

Short-term

69,788

78,692

Long-term

24,966

79,599

Short-term interest payable

2,373

631

Long-term interest payable

$ 0

[1]

They correspond to judicial and private agreements signed for the debt recognition with respect to Deposit Certificates secured and backed by Almacenadora de Deposito Moderno, S.A. de C.V. (ADEMSA), a related party.

Financial assets and liabilit_5

Financial assets and liabilities, Covenants (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Covenants [Abstract]
Long-term financial debt	$ 53,644	$ 118,737
2021 [Member]
Covenants [Abstract]
Long-term financial debt	0	57,017
2022 [Member]
Covenants [Abstract]
Long-term financial debt	23,638	31,861
2023 [Member]
Covenants [Abstract]
Long-term financial debt	16,315	25,427
2024 [Member]
Covenants [Abstract]
Long-term financial debt	8,275	4,427
2025 [Member]
Covenants [Abstract]
Long-term financial debt	2,703	5
2026 [Member]
Covenants [Abstract]
Long-term financial debt	2,713	0
Trust Certificates and Bank Loans [Member]
Covenants [Abstract]
Interest expense	$ 38,558	$ 69,796

Balances and transactions wit_3

Balances and transactions with related parties (Details) - MXN ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balances and transactions with related parties [Abstract]
Receivable		$ 42,228	$ 163,344
Payable		1,458	87,573
Amount of related party receivable forgiven		98,859
Revenues [Abstract]
Revenue, related parties		131,636	160,530	$ 187,492
Costs [Abstract]
Sub-agency commissions	[1]	107,692	264,743	0
Expenses [Abstract]
Other expenses	[2]	440	391	366
Maritime Services [Member]
Revenues [Abstract]
Revenue, related parties	[3]	131,137	159,772	187,426
Shipping Agencies [Member]
Revenues [Abstract]
Revenue, related parties	[4]	499	758	0
Leases [Member]
Revenues [Abstract]
Revenue, related parties	[5]	0	0	66
TMM Division Maritima, S.A. de C.V. [Member]
Balances and transactions with related parties [Abstract]
Receivable	[6]	42,228	163,344
Payable	[6]	0	0
SSA Mexico, S.A. de C.V. [Member]
Balances and transactions with related parties [Abstract]
Receivable	[7]	0	0
Payable	[7]	1,458	87,573
Executive Personnel [Member]
Short-term benefits [abstract]
Salaries		36,003	40,851	33,790
Social security costs		1,633	497	462
Short-term benefits		$ 37,636	$ 41,348	$ 34,252

[1]	Shipping agency servicies provided by SSA Mexico, S.A. de C.V. to Administradora Maritima TMM, S.A.P.I. de C.V.
[2]	Management consulting provided by SSA Mexico, S.A. de C.V. to Administracion Portuaria Integral de Acapulco, S.A. de C.V.
[3]	Maritime services between TMM Direccion Corporativa, S.A. de C.V, subsidiary of Grupo TMM, and TMM DM.
[4]	Shipping agency services between Administradora Maritima TMM, S.A.P.I. de C.V., subsidiary of Grupo TMM, and TMM DM.
[5]	Grupo TMM, S.A.B. leasing operation with SSA Mexico, S.A. de C.V. in Acapulco, Guerrero.
[6]	The accounts receivable is related to the maritime services provided to TMM DM by Grupo TMM. In September 2020, the Company agreed through an agreement with this related party to forgive $98,859.
[7]	The accounts payables to SSA Mexico, S.A. de C.V., are largely due to subagency services that this related party provides to Grupo TMM.

Accounts payable and accrued _3

Accounts payable and accrued expenses (Details) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts payable and accrued expenses [Abstract]
General expenses	$ 259,151	$ 212,595
Operating expenses	57,929	96,004
Purchased services	89,976	95,470
Taxes payable	38,281	37,637
Salaries and wages	924	3,256
Others	78,847	54,567
Accounts payable and accrued expenses	$ 525,108	$ 499,529

Stockholders' equity (Details)

Stockholders' equity (Details) - MXN ($) $ in Thousands	12 Months Ended
Stockholders' equity (Details) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Capital stock [Abstract]
Shares outstanding (in shares)	102,182,841	102,182,841
Number of CPO's per ADS (in shares)	5
Net tax profit account (CUFIN) [Abstract]
Period of credit against income tax on CUFIN dividends not drawn	2 years
Capital decreases [Abstract]
Capital Contribution Account balance	$ 4,868,700	$ 4,720,020
Ordinary shares [member]
Capital stock [Abstract]
Shares outstanding (in shares)	102,182,841	102,182,841	102,182,841	102,182,841
Number of common shares called by each CPO (in shares)	1
CUFIN generated up to December 31, 2013 [Member]
Net tax profit account (CUFIN) [Abstract]
Net tax profit account balance	$ 3,727,180	$ 3,613,359
CUFIN generated beginning 2014 [Member]
Net tax profit account (CUFIN) [Abstract]
Net tax profit account balance	$ 0	$ 0

Stockholders' equity, Other Com

Stockholders' equity, Other Components of equity (Details) - MXN ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Other components of equity [Abstract]
Balance, beginning of period		$ 2,422,792		$ 2,124,258	$ 2,229,062
Revaluation of assets		314,436		379,420	(161,411)
Defined benefit plan		10,953		2,354	15,430
Tax expense		(97,617)		(114,532)	43,794
Total net of taxes		227,772		267,242	(102,187)
Balance, end of period		2,247,408		2,422,792	2,124,258
Statutory Reserve [Member]
Other components of equity [Abstract]
Balance, beginning of period		216,948		216,948
Revaluation of assets		0		0
Defined benefit plan		0		0
Reclassification from disposal of properties and depreciation / revaluation of assets		0		0
Total before taxes		0		0
Tax expense		0		0
Total net of taxes		0		0
Balance, end of period		216,948		216,948	216,948
Defined Benefit Plan [Member]
Other components of equity [Abstract]
Balance, beginning of period		(123,769)		(125,417)
Revaluation of assets		0		0
Defined benefit plan		10,953		2,354
Reclassification from disposal of properties and depreciation / revaluation of assets		0		0
Total before taxes		10,953		2,354
Tax expense		(3,286)		(706)
Total net of taxes		7,667		1,648
Balance, end of period		(116,102)		(123,769)	(125,417)
Premium on Convertible Obligations [Member]
Other components of equity [Abstract]
Balance, beginning of period		77,106		77,106
Revaluation of assets		0		0
Defined benefit plan		0		0
Reclassification from disposal of properties and depreciation / revaluation of assets		0		0
Total before taxes		0		0
Tax expense		0		0
Total net of taxes		0		0
Balance, end of period		77,106		77,106	77,106
Translation Result [Member]
Other components of equity [Abstract]
Balance, beginning of period		(247,668)		(247,668)
Revaluation of assets		0		0
Defined benefit plan		0		0
Reclassification from disposal of properties and depreciation / revaluation of assets		0		0
Total before taxes		0		0
Tax expense		0		0
Total net of taxes		0		0
Balance, end of period		(247,668)		(247,668)	(247,668)
Revaluation Surplus [Member]
Other components of equity [Abstract]
Balance, beginning of period		849,341		785,975
Revaluation of assets		314,436	[1]	379,420
Defined benefit plan		0		0
Reclassification from disposal of properties and depreciation / revaluation of assets	[2]	(55)		(202,228)
Total before taxes		314,381		177,192
Tax expense		(94,331)		(113,826)
Total net of taxes		220,050		63,366
Balance, end of period		1,069,391		849,341	785,975
Other Components of Equity [Member]
Other components of equity [Abstract]
Balance, beginning of period		771,958		706,944	849,466
Revaluation of assets		314,436		379,420
Defined benefit plan		10,953		2,354
Reclassification from disposal of properties and depreciation / revaluation of assets		(55)		(202,228)
Total before taxes		325,334		179,546
Tax expense		(97,617)		(114,532)
Total net of taxes		227,717		65,014	(142,522)
Balance, end of period		$ 999,675		$ 771,958	$ 706,944

[1]	Corresponds to the revaluation of the land of the project called "Liquid Storage Terminal", derived from changes in the conditions of the project generated by obtaining permits, the revaluation allows the Management to know the fair value of the property based on at its best use.
[2]	It corresponds to the reclassification of the revaluation surplus to accumulated losses from the sale of properties and disposals of vessels, as well as the depreciation for the period of revaluation of properties and vessels.

Revenues (Details)

Revenues (Details) - MXN ($) $ in Thousands	12 Months Ended
Revenues (Details) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Segment Revenues [Abstract]
Total consolidated revenue	$ 1,203,281	$ 1,475,683	$ 1,523,066
Parcel Tankers [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	340,767	287,140	312,305
Maritime Administration Services [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	131,136	159,772	187,426
Shipyards [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	100,864	164,917	138,517
Bulk Carrier [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	85,085	162,897	144,664
Tugboats [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	0	81,707	70,037
Offshore Vessels [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	93,373	12,072	56,506
Port Services [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	41,659	90,144	101,688
Shipping Agencies [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	27,530	79,695	64,283
Repair of Containers [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	196,584	211,171	234,534
Warehousing [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	139,042	171,867	160,991
Intermodal Terminal [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	41,794	49,157	47,581
Automotive Services [Member]
Operating Segment Revenues [Abstract]
Total consolidated revenue	$ 5,447	$ 5,144	$ 4,534

Other (expenses) income (Detail

Other (expenses) income (Details) - MXN ($) $ in Thousands	12 Months Ended
Other (expenses) income (Details) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other (expenses) income [Abstract]
Gain (loss) from the sale of subsidiaries (see Note 5)	$ 451	$ 279,744	$ 111,484
Recoveries of taxes paid in prior years, net of expenses for recovery	(11,145)	(16,595)	(3,919)
Cancellation of projects	(31,804)	(18,944)	(5,604)
Forgiveness of accounts receivable	(98,859)	0	0
Expenses related to the cancellation of the corporate building lease	(113,469)	0	0
Goodwill impairment (see Note 5)	0	(9,826)	0
Other, net	(2,399)	(472)	664
Other (expenses) income	$ (257,225)	$ 233,907	$ 102,625

Interest expense and other fi_3

Interest expense and other financial costs (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest expense and other financial costs [Abstract]
Interest on financial debt	$ 38,558	$ 69,796	$ 80,580
Interest expense on leasing arrangements	33,535	70,225	0
Other financial expenses	2,066	5,303	2,146
Amortization of transaction cost associated with financial debt	1,495	1,551	2,164
Interest expense and other financial costs	$ 75,654	$ 146,875	$ 84,890

Income tax and tax loss carry_3

Income tax and tax loss carryforwards, Results for the year (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018
Results for the year [Abstract]
Combined tax losses	$ (422,490)	$ 95,867		$ 28,348
Income tax recognized	$ (19,334)	$ 64,575		$ 4,799
Enacted Income Tax Law rate	30.00%	30.00%		30.00%
Provision for income tax recognized in statement of profit or loss [Abstract]
Income tax	$ (10,873)	$ (14,512)		$ (4,799)
Income tax (agreement)	0	(85,196)	[1]	0
Deferred income tax	30,207	35,133		0
Total income tax expense	19,334	(64,575)		$ (4,799)
Taxes payable, periodic payment		2,600
Grupo TMM and Subsidiaries [Member]
Results for the year [Abstract]
Combined tax losses	(383,647)	(397,746)
Subsidiaries [Member]
Results for the year [Abstract]
Income tax recognized	36,243	48,373
Provision for income tax recognized in statement of profit or loss [Abstract]
Total income tax expense	$ (36,243)	$ (48,373)

[1]	During 2019, Grupo TMM agreed with the Tax Administration Service to resolve the Company's outstanding tax liabilities for the fiscal year 2010 through payment of 2.6 million pesos over a period of 36 months beginning in November 2019.

Income tax and tax loss carry_4

Income tax and tax loss carryforwards, Reconciliation for income tax based on statutory rate (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018
Reconciliation between provision for income tax based on statutory income tax rate and provision recorded [Abstract]
(Loss) profit before taxes	$ (422,490)	$ 95,867		$ 28,348
Income tax	126,747	(28,760)		(8,504)
Increase (decrease) from [Abstract]
Difference in depreciation and amortization	(86,033)	(180,395)		(56,356)
Revaluation surplus	94,331	113,826		(48,424)
Income recognized in advance	0	0		(62)
Materials and supplies	3,625	(31,073)		(19,888)
Inflationary and currency exchange effects on monetary assets and liabilities, net	(4,035)	1,236		(26,686)
Tax losses - net	12,054	19,277		206,485
Provisions and allowance for doubtful accounts	(78,527)	54,214		(44,609)
Forgiveness of accounts receivable	(29,658)	0		0
Difference between the tax and book value for the sale of assets	(14,276)	(13,133)		(15,551)
Difference between the tax and book value for the sale of shares of subsidiaries	(104)	97,284		20,800
Non-deductible expenses	(4,790)	(11,855)		(12,004)
Income tax (agreement)	0	(85,196)	[1]	0
Total income tax expense	$ 19,334	$ (64,575)		$ (4,799)

[1]	During 2019, Grupo TMM agreed with the Tax Administration Service to resolve the Company's outstanding tax liabilities for the fiscal year 2010 through payment of 2.6 million pesos over a period of 36 months beginning in November 2019.

Income tax and tax loss carry_5

Income tax and tax loss carryforwards, Components of deferred tax liability (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Components of deferred tax liability [Abstract]
Portion of tax loss carryforwards for subsequent years	$ 350,272	$ 338,218
Inventories and provisions - net	41,080	51,657
Concession rights and property, vessels and equipment	(706,976)	(638,089)
Total deferred tax liability	$ (315,624)	$ (248,214)
Percentage of recoverable tax losses	51.00%

Income tax and tax loss carry_6

Income tax and tax loss carryforwards, Tax loss carryforwards (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020MXN ($)
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 2,302,717
2011 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 66,483
Year of expiration	2021
2012 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 168,689
Year of expiration	2022
2013 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 199,466
Year of expiration	2023
2014 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 142,463
Year of expiration	2024
2015 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 69,170
Year of expiration	2025
2016 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 410,181
Year of expiration	2026
2017 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 103,125
Year of expiration	2027
2018 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 216,620
Year of expiration	2028
2019 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 491,902
Year of expiration	2029
2020 - Year Loss Incurred [Member]
Tax loss carryforwards [Abstract]
Tax loss carryforward amount	$ 434,618
Year of expiration	2030

Segment reporting (Details)

Segment reporting (Details) - MXN ($) $ in Thousands	12 Months Ended
Segment reporting (Details) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment reporting [Abstract]
Revenue	$ 1,203,281	$ 1,475,683	$ 1,523,066
Costs and expenses	(1,037,448)	(1,140,217)	(1,248,753)
Corporate expenses	(96,345)	(173,726)	(198,404)
Depreciation and amortization	(141,051)	(182,880)	(80,277)
Transportation loss	(71,563)	(21,140)	(4,368)
Net profit for the year	(403,156)	31,292	23,549
Total assets	4,030,547	4,563,775	3,781,084
Total liabilities	1,783,139	2,140,983	1,656,826
Total capital expenditures	28,375	48,281	86,283
Operating Segments [Member]
Segment reporting [Abstract]
Total assets	3,515,001	3,701,383	3,222,043
Total liabilities	1,348,145	1,330,742	1,394,054
Total capital expenditures	16,864	37,226	57,095
Operating Segments [Member] \| Specialized Maritime Division [Member]
Segment reporting [Abstract]
Revenue	751,225	868,505	909,455
Costs and expenses	(634,919)	(652,157)	(727,535)
Depreciation and amortization	(41,764)	(66,306)	(59,451)
Transportation loss	74,542	150,042	122,469
Total assets	1,060,473	1,285,751	1,820,844
Total liabilities	363,098	431,893	887,042
Total capital expenditures	7,608	12,048	42,745
Operating Segments [Member] \| Logistics Division [Member]
Segment reporting [Abstract]
Revenue	243,825	265,472	286,649
Costs and expenses	(217,699)	(232,386)	(248,364)
Depreciation and amortization	(22,571)	(19,474)	(2,772)
Transportation loss	3,555	13,612	35,513
Total assets	250,188	266,079	240,024
Total liabilities	141,723	158,203	159,956
Total capital expenditures	33	598	592
Operating Segments [Member] \| Ports and Terminals Division [Member]
Segment reporting [Abstract]
Revenue	69,189	169,839	165,971
Costs and expenses	(74,521)	(122,882)	(106,993)
Depreciation and amortization	(15,423)	(15,186)	(9,616)
Transportation loss	(20,755)	31,771	49,362
Total assets	1,664,819	1,763,135	866,849
Total liabilities	498,233	567,030	280,473
Total capital expenditures	5,137	24,086	13,176
Operating Segments [Member] \| Warehousing Division [Member]
Segment reporting [Abstract]
Revenue	139,042	171,867	160,991
Costs and expenses	(110,309)	(132,792)	(165,388)
Depreciation and amortization	(45,261)	(41,516)	(1,305)
Transportation loss	(16,528)	(2,441)	(5,702)
Total assets	539,521	386,418	294,326
Total liabilities	345,091	173,616	66,583
Total capital expenditures	4,086	494	582
Shared Accounts [Member] \| Other Businesses [Member]
Segment reporting [Abstract]
Revenue	0	0	0
Costs and expenses	0	0	(473)
Corporate expenses	(96,345)	(173,726)	(198,404)
Depreciation and amortization	(16,032)	(40,398)	(7,133)
Transportation loss	(112,377)	(214,124)	(206,010)
Total assets	515,546	862,392	559,041
Total liabilities	434,994	810,241	262,772
Total capital expenditures	11,511	11,055	29,188
Unallocated Amounts [Member]
Segment reporting [Abstract]
Transportation loss	$ (331,593)	$ 52,432	$ 27,917

Employee benefits, Expenses and

Employee benefits, Expenses and liabilities recognized for pensions and other employee remunerations (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Expenses recognized [Abstract]
Salaries, benefits and inherent	$ 317,776	$ 320,827	$ 347,403
Pensions - defined benefit plans	23,623	22,873	21,211
Employee benefits expense	341,399	343,700	$ 368,614
Long-term [Abstract]
Employee benefits	150,197	151,481
Short term liabilities and remunerations [Abstract]
Short-term employee benefits accruals	924	3,256
Actuarial (loss) gain net of taxes	7,667	1,648
Pensions and Seniority Premiums [Member]
Long-term [Abstract]
Employee benefits	136,832	141,014
Termination of Employment [Member]
Long-term [Abstract]
Employee benefits	$ 13,365	$ 10,467

Employee benefits, Net cost for

Employee benefits, Net cost for period (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Details for net cost [Abstract]
Interest cost	$ (257)	$ (208)
Net cost for the period	19,027	22,873
Pensions and Seniority Premiums [Member]
Details for net cost [Abstract]
Current service cost	4,541	4,709
Interest cost	11,892	13,643
Net cost for the period	16,433	18,352
Termination of Employment [Member]
Details for net cost [Abstract]
Current service cost	1,727	2,178
Interest cost	867	2,343
Net cost for the period	$ 2,594	$ 4,521

Employee benefits, Reserve (Det

Employee benefits, Reserve (Details) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Reserve for pension, seniority premiums and termination of employment [Abstract]
Total reserve	$ 150,197	$ 151,481
Pensions and Seniority Premiums [Member]
Reserve for pension, seniority premiums and termination of employment [Abstract]
Total reserve	136,832	141,014
Pensions and Seniority Premiums [Member] \| Defined Benefit Obligations [Member]
Reserve for pension, seniority premiums and termination of employment [Abstract]
Total reserve	139,763	144,044
Pensions and Seniority Premiums [Member] \| Plan Assets [Member]
Reserve for pension, seniority premiums and termination of employment [Abstract]
Total reserve	(2,931)	(3,030)
Termination of Employment [Member]
Reserve for pension, seniority premiums and termination of employment [Abstract]
Total reserve	13,365	10,467
Termination of Employment [Member] \| Defined Benefit Obligations [Member]
Reserve for pension, seniority premiums and termination of employment [Abstract]
Total reserve	13,365	10,467
Termination of Employment [Member] \| Plan Assets [Member]
Reserve for pension, seniority premiums and termination of employment [Abstract]
Total reserve	$ 0	$ 0

Employee benefits, Defined bene

Employee benefits, Defined benefit obligation (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [abstract]
Balance at beginning of period	$ 151,481	$ 176,606
Interest cost	(257)	(208)
Benefits paid	(2,142)	(338)
Miscellaneous	356	0
Past service cost	0	(38,187)
Actuarial gain or losses	(10,953)	(1,648)
Balance at end of period	150,197	151,481
Pensions and Seniority Premiums [Member]
Disclosure of net defined benefit liability (asset) [abstract]
Current service cost	4,541	4,709
Interest cost	11,892	13,643
Pensions and Seniority Premiums [Member] \| DBO [Member]
Disclosure of net defined benefit liability (asset) [abstract]
Balance at beginning of period	144,044	154,128
Current service cost	4,541	4,709
Interest cost	11,892	13,643
Benefits paid	(2,072)	(338)
Benefits paid from plan assets	(7,315)	(7,617)
Miscellaneous	0	(304)
Past service cost	0	(16,822)
Actuarial gain or losses	(11,327)	(3,355)
Balance at end of period	139,763	144,044
Termination of Employment [Member]
Disclosure of net defined benefit liability (asset) [abstract]
Current service cost	1,727	2,178
Interest cost	867	2,343
Termination of Employment [Member] \| DBO [Member]
Disclosure of net defined benefit liability (asset) [abstract]
Balance at beginning of period	10,467	25,604
Current service cost	1,727	2,178
Interest cost	867	2,343
Benefits paid	(70)	0
Benefits paid from plan assets	0	0
Miscellaneous	0	0
Past service cost	0	(21,365)
Actuarial gain or losses	374	1,707
Balance at end of period	$ 13,365	$ 10,467

Employee benefits, Plan assets

Employee benefits, Plan assets (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Plan assets [Abstract]
Balance at beginning of period	$ 151,481	$ 176,606
Plan contributions	7,315	7,617
Interests on plan assets	(257)	(208)
Miscellaneous	356	0
Balance at end of period	150,197	151,481
Plan Assets [Member]
Plan assets [Abstract]
Balance at beginning of period	3,030	3,126
Expected return on assets	(356)	310
Plan contributions	7,315	7,617
Benefits paid	(7,315)	(7,617)
Interests on plan assets	257	208
Miscellaneous	0	(614)
Balance at end of period	$ 2,931	$ 3,030

Employee benefits, Changes in p

Employee benefits, Changes in pension plan, seniority premium and termination of employment plan (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Changes in pension plan [Abstract]
Balance at beginning of period	$ 151,481	$ 176,606
Cost for the period	19,027	22,873
Interest income	(257)	(208)
Contributions to the plan	(7,315)	(7,617)
Benefits paid on pension plan	(2,142)	(338)
Miscellaneous	356	0
Actuarial gain or losses	(10,953)	(1,648)
Past service cost	0	(38,187)
Balance at end of period	$ 150,197	$ 151,481

Employee benefits, Significant

Employee benefits, Significant actuarial assumptions (Details) $ in Thousands	Dec. 31, 2020MXN ($)Employee	Dec. 31, 2019Employee
Significant actuarial assumptions [Abstract]
Percentage of employees working under collective bargaining agreements	12.00%	18.00%
Number of employees \| Employee	934	1,099
Discount Rate [Member]
Significant actuarial assumptions [Abstract]
Significant actuarial assumptions used for valuation	7.50%	8.50%
Discount Rate [Member] \| 1.0% Increase [Member]
Significant actuarial assumptions [Abstract]
Increase (decrease) in defined benefit obligation	$ (54)
Discount Rate [Member] \| 1.0% Decrease [Member]
Significant actuarial assumptions [Abstract]
Increase (decrease) in defined benefit obligation	$ 6,598
Salary Increase Rate [Member]
Significant actuarial assumptions [Abstract]
Significant actuarial assumptions used for valuation	4.00%	4.00%
Salary Increase Rate [Member] \| 1.0% Increase [Member]
Significant actuarial assumptions [Abstract]
Increase (decrease) in defined benefit obligation	$ 5,711
Salary Increase Rate [Member] \| 1.0% Decrease [Member]
Significant actuarial assumptions [Abstract]
Increase (decrease) in defined benefit obligation	$ (678)
Inflation Rate [Member]
Significant actuarial assumptions [Abstract]
Significant actuarial assumptions used for valuation	3.50%	3.50%
Average Working Life Expectancy [Member]
Significant actuarial assumptions [Abstract]
Significant actuarial assumptions used for valuation	16.10%	18.30%
Average Working Life Expectancy [Member] \| One year Increase [Member]
Significant actuarial assumptions [Abstract]
Increase (decrease) in defined benefit obligation	$ 3,426
Average Working Life Expectancy [Member] \| One year Decrease [Member]
Significant actuarial assumptions [Abstract]
Increase (decrease) in defined benefit obligation	$ (3,490)

Earnings per share (Details)

Earnings per share (Details) - shares	12 Months Ended
Earnings per share (Details) - shares	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings per share [Abstract]
Number of potentially dilutive instruments outstanding (in shares)	0	0	0

Fair value measurement, Fair va

Fair value measurement, Fair value measures for non-financial assets (Details) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair value measurement [Abstract]
Non-financial assets	$ 4,030,547	$ 4,563,775	$ 3,781,084
Recurring [Member] \| Level 3 [Member]
Fair value measurement [Abstract]
Non-financial assets	2,402,632	2,112,521
Recurring [Member] \| Vessels [Member] \| Level 3 [Member]
Fair value measurement [Abstract]
Non-financial assets	182,055	214,938	$ 782,673
Recurring [Member] \| Buildings and Facilities [Member] \| Level 3 [Member]
Fair value measurement [Abstract]
Non-financial assets	286,232	299,660
Recurring [Member] \| Land [Member] \| Level 3 [Member]
Fair value measurement [Abstract]
Non-financial assets	$ 1,934,345	$ 1,597,923

Fair value measurement, Informa

Fair value measurement, Information used for appraisal (Details) - Recurring [Member] - Discounted Cash Flow [Member]	12 Months Ended
	Dec. 31, 2020USD ($)
Offshore Vessels [Member]
Information used for appraisal [Abstract]
Daily rate or fee	$ 4,504
Average percentage of utilization	78.00%
Discount rate	0.0744
Parcel Tankers [Member]
Information used for appraisal [Abstract]
Daily rate or fee	$ 15,805
Average percentage of utilization	89.00%
Discount rate	0.0765

Fair value measurement, Reconci

Fair value measurement, Reconciliation of non-financial assets classified within Level 3 (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation between the carrying amounts of non-financial assets [Abstract]
Beginning balance	$ 4,563,775	$ 3,781,084
Amount recognized in statements profit or loss [Abstract]
Ending balance	4,030,547	4,563,775
Recurring [Member] \| Level 3 [Member]
Reconciliation between the carrying amounts of non-financial assets [Abstract]
Beginning balance	2,112,521
Amount recognized in statements profit or loss [Abstract]
Ending balance	2,402,632	2,112,521
Effects from unrealized gains from fair value measurements	0	0
Recurring [Member] \| Vessels [Member] \| Level 3 [Member]
Reconciliation between the carrying amounts of non-financial assets [Abstract]
Beginning balance	214,938	782,673
Amount recognized in other comprehensive income [Abstract]
Revaluation surplus of vessels	0	41,026
Amount recognized in statements profit or loss [Abstract]
Loss on revaluation of vessels	(16,136)	(39,199)
Total gains (losses) recognized in other comprehensive income and in statements of operations	(16,136)	1,827
Additions and disposals, net	(16,747)	(569,562)
Ending balance	182,055	214,938
Recurring [Member] \| Buildings and Facilities [Member] \| Level 3 [Member]
Reconciliation between the carrying amounts of non-financial assets [Abstract]
Beginning balance	1,897,583	1,385,153
Amount recognized in other comprehensive income [Abstract]
Revaluation surplus of vessels	330,571	377,593
Amount recognized in statements profit or loss [Abstract]
Loss on revaluation of vessels	0	0
Total gains (losses) recognized in other comprehensive income and in statements of operations	330,571	377,593
Additions and disposals, net	(7,577)	134,837
Ending balance	$ 2,220,577	$ 1,897,583

Financial instruments risk, Cur

Financial instruments risk, Currency risk (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020MXN ($)$ / $	Dec. 31, 2019MXN ($)$ / $
Currency Risk [Member]
Currency risk [Abstract]
Percentage of sales denominated in US dollars	55.00%	45.00%
Percentage of costs and expenses denominated in US dollars	20.00%	25.00%
Foreign exchange rate \| $ / $	19.9352	18.8727
Currency Risk [Member] \| Minimum [Member]
Currency risk [Abstract]
Assumed variance on foreign exchange rate	11.64%	22.10%
Currency Risk [Member] \| Maximum [Member]
Currency risk [Abstract]
Assumed variance on foreign exchange rate	11.64%	22.10%
Currency Risk [Member] \| US [Member]
Currency risk [Abstract]
Assets	$ 309,657	$ 547,320
Liabilities	(480,253)	(1,042,661)
Total assets (liabilities)	(170,596)	(495,341)
Currency Risk [Member] \| Other Currencies [Member]
Currency risk [Abstract]
Assets	932	1,093
Liabilities	(1,372)	(1,641)
Total assets (liabilities)	(440)	(548)
11.64% Increase in the Exchange Rate [Member]
Currency risk [Abstract]
Total assets (liabilities)	(19,902)
11.64% Increase in the Exchange Rate [Member] \| US [Member]
Currency risk [Abstract]
Assets	36,030
Liabilities	(55,880)
11.64% Increase in the Exchange Rate [Member] \| Other Currencies [Member]
Currency risk [Abstract]
Assets	108
Liabilities	(160)
11.64% Decrease in the Exchange Rate [Member]
Currency risk [Abstract]
Total assets (liabilities)	19,902
11.64% Decrease in the Exchange Rate [Member] \| US [Member]
Currency risk [Abstract]
Assets	(36,030)
Liabilities	55,880
11.64% Decrease in the Exchange Rate [Member] \| Other Currencies [Member]
Currency risk [Abstract]
Assets	(108)
Liabilities	$ 160
22.10% Increase in the Exchange Rate [Member]
Currency risk [Abstract]
Total assets (liabilities)		(109,578)
22.10% Increase in the Exchange Rate [Member] \| US [Member]
Currency risk [Abstract]
Assets		120,944
Liabilities		(230,401)
22.10% Increase in the Exchange Rate [Member] \| Other Currencies [Member]
Currency risk [Abstract]
Assets		242
Liabilities		(363)
22.10% Decrease in the Exchange Rate [Member]
Currency risk [Abstract]
Total assets (liabilities)		109,578
22.10% Decrease in the Exchange Rate [Member] \| US [Member]
Currency risk [Abstract]
Assets		(120,944)
Liabilities		230,401
22.10% Decrease in the Exchange Rate [Member] \| Other Currencies [Member]
Currency risk [Abstract]
Assets		(242)
Liabilities		$ 363

Financial instruments risk, Int

Financial instruments risk, Interest rate risks (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest rate risks [Abstract]
Profit or loss for the year	$ (403,156)	$ 31,292	$ 23,549
Interest Rate Risks [Member]
Interest rate risks [Abstract]
Percentage increase in interest rates	8.24%	7.05%
Percentage decrease in interest rates	(8.24%)	(7.05%)
Interest Rate Risks [Member] \| Fixed Rate [Member]
Interest rate risks [Abstract]
Debt	$ 129,800	$ 103,000
Interest Rate Risks [Member] \| Variable Rate [Member]
Interest rate risks [Abstract]
Debt	50,200	159,100
8.24% Variance [Member]
Interest rate risks [Abstract]
Profit or loss for the year	(1,140)
- 8.24% Variance [Member]
Interest rate risks [Abstract]
Profit or loss for the year	$ 1,140
7.05% Variance [Member]
Interest rate risks [Abstract]
Profit or loss for the year		(1,698)
- 7.05% Variance [Member]
Interest rate risks [Abstract]
Profit or loss for the year		$ 1,698

Financial instruments risk, Cre

Financial instruments risk, Credit risk and Concentration of risk (Details) - Credit Risk [Member]	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Credit risk [Abstract]
Average payment period of significant client	180 days
TMM DM [Member]
Concentration of risk [Abstract]
Percentage of revenue	14.00%	17.00%
Helmsley Management [Member]
Concentration of risk [Abstract]
Percentage of revenue	7.00%	11.00%
Grupo Celanese [Member]
Concentration of risk [Abstract]
Percentage of revenue	13.00%	7.00%
Remaining Customers [Member] \| Maximum [Member]
Concentration of risk [Abstract]
Percentage of revenue	4.00%	4.00%

Financial instruments risk, Exp

Financial instruments risk, Expected Credit Loss for Trade Accounts Receivable (Details) - Trade Receivables [Member] - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Gross Carrying Value [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 152,036	$ 292,972
Expected Credit Losses During Life [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 21,218	$ 14,385
Current [Member]
Expected credit loss for trade accounts receivable [Abstract]
Expected credit loss rate	0.00%	0.00%
Current [Member] \| Gross Carrying Value [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 77,030	$ 214,850
Current [Member] \| Expected Credit Losses During Life [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 0	$ 0
More Than 30 Days [ Member]
Expected credit loss for trade accounts receivable [Abstract]
Expected credit loss rate	0.00%	0.00%
More Than 30 Days [ Member] \| Gross Carrying Value [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 5,875	$ 18,398
More Than 30 Days [ Member] \| Expected Credit Losses During Life [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 0	$ 0
More Than 60 Days [Member]
Expected credit loss for trade accounts receivable [Abstract]
Expected credit loss rate	0.00%	2.30%
More Than 60 Days [Member] \| Gross Carrying Value [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 4,290	$ 7,976
More Than 60 Days [Member] \| Expected Credit Losses During Life [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 0	$ 185
More Than 90 Days [Member]
Expected credit loss for trade accounts receivable [Abstract]
Expected credit loss rate	32.70%	27.40%
More Than 90 Days [Member] \| Gross Carrying Value [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 64,841	$ 51,748
More Than 90 Days [Member] \| Expected Credit Losses During Life [Member]
Expected credit loss for trade accounts receivable [Abstract]
Financial assets	$ 21,218	$ 14,200

Financial instruments risk, Liq

Financial instruments risk, Liquidity risk and Dissolution of Company risk (Details) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Liquidity risk [Abstract]
Trade payables	$ 228,959	$ 262,159
Accounts payable and accrued expenses	525,108	499,529
Leasing liabilities	355,513	587,359
Financial debt	$ 182,729	$ 257,926
Liquidity Risk [Member]
Liquidity risk [Abstract]
Percentage of financial liabilities due in next 12 months	35.00%	24.00%
Liquidity Risk [Member] \| In 6 Months [Member]
Liquidity risk [Abstract]
Trade payables	$ 228,959	$ 0
Accounts payable and accrued expenses	0	0
Leasing liabilities	29,465	34,908
Financial debt	52,125	55,139
Total financial liabilities	310,549	90,047
Liquidity Risk [Member] \| 6 to 12 Months [Member]
Liquidity risk [Abstract]
Trade payables	0	262,159
Accounts payable and accrued expenses	525,108	499,529
Leasing liabilities	28,780	25,670
Financial debt	76,960	84,050
Total financial liabilities	630,848	871,408
Liquidity Risk [Member] \| 1 to 4 Years [Member]
Liquidity risk [Abstract]
Trade payables	0	0
Accounts payable and accrued expenses	23,522	46,742
Leasing liabilities	193,811	130,238
Financial debt	48,227	113,288
Total financial liabilities	265,560	290,268
Liquidity Risk [Member] \| More than 4 Years [Member]
Liquidity risk [Abstract]
Trade payables	0	0
Accounts payable and accrued expenses	0	0
Leasing liabilities	103,457	396,543
Financial debt	5,417	5,449
Total financial liabilities	$ 108,874	$ 401,992

Capital management policies a_3

Capital management policies and procedures (Details) $ in Thousands	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)	Dec. 31, 2017MXN ($)
Capital management policies and procedures [Abstract]
Stockholders' equity	$ 2,247,408	$ 2,422,792	$ 2,124,258	$ 2,229,062
Cash and cash equivalents	(142,982)	(512,799)
Stockholders' equity, net	2,104,426	1,909,993
Total financial debt	182,729	257,926
Leasing liabilities	355,513	587,359
Overall financing	$ 538,242	$ 845,285
Capital-to-overall financing ratio	3.91	2.26

Commitments and contingencies,

Commitments and contingencies, Commitments (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Commitments [Abstract]
Concession fees	$ 7,507	$ 7,536

Commitments and contingencies_2

Commitments and contingencies, Contingencies (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2007	Oct. 19, 2007	Aug. 07, 2007
Contingencies [Abstract]
Contingent liability	$ 2,400
RPS Claim [Member]
Contingencies [Abstract]
Contingent asset				$ 50
Contingent liability			$ 3,000
Mutual Loans Between WWS and TMM [Member]
Contingencies [Abstract]
Contingent asset		$ 394
Contingent liability		$ 938

Subsequent events to the repo_2

Subsequent events to the reporting date (Details) $ in Thousands	Dec. 02, 2020MXN ($)
Subsequent events to the reporting date [Abstract]
Amount of advance received on sale of vessel	$ 63,700