SEACOR Marine (SMHI) 10-Q1 May 242024 Q1 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2024	Apr. 26, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Trading Symbol	SMHI
Entity Registrant Name	SEACOR Marine Holdings Inc.
Entity Central Index Key	0001690334
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		27,602,032
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	1-37966
Entity Tax Identification Number	47-2564547
Entity Address, Address Line One	12121 Wickchester Lane
Entity Address, Address Line Two	Suite 500
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77079
City Area Code	346
Local Phone Number	980-1700
Entity Incorporation, State or Country Code	DE
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common stock
Security Exchange Name	NYSE
Document Quarterly Report	true
Document Transition Report	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 59,593	$ 67,455
Restricted cash	2,566	16,676
Receivables:
Trade, net of allowance for credit loss of $4,546 and $4,543 as of March 31, 2024 and December 31, 2023, respectively	58,272	63,728
Other	12,210	11,049
Tax receivable	983	983
Inventories	2,516	1,609
Prepaid expenses and other	3,425	2,686
Assets held for sale	500	500
Total current assets	140,065	164,686
Property and Equipment:
Historical cost	919,139	918,823
Accumulated depreciation	(337,001)	(324,141)
Property and equipment	582,138	594,682
Construction in progress	13,410	10,362
Net property and equipment	595,548	605,044
Right-of-use asset - operating leases	3,988	4,291
Right-of-use asset - finance leases	29	37
Investments, at equity, and advances to 50% or less owned companies	3,122	4,125
Other assets	2,094	2,153
Total assets	744,846	780,336
Current Liabilities:
Current portion of operating lease liabilities	1,285	1,591
Current portion of finance lease liabilities	33	35
Current portion of long-term debt	28,605	28,365
Accounts payable	23,453	27,562
Accrued wages and benefits	3,133	5,083
Accrued interest	3,876	1,850
Unearned revenue	2,057	687
Accrued capital, repair, and maintenance expenditures	3,402	2,471
Accrued insurance deductibles and premiums	2,636	3,189
Derivatives	99	0
Other current liabilities	5,864	6,253
Total current liabilities	74,443	77,086
Long-term operating lease liabilities	3,390	3,529
Long-term finance lease liabilities	0	6
Long-term debt	281,989	287,544
Deferred income taxes	33,873	35,718
Deferred gains and other liabilities	2,285	2,229
Total liabilities	395,980	406,112
SEACOR Marine Holdings Inc. stockholders’ equity:
Common stock, $.01 par value, 60,000,000 shares authorized; 28,395,684 and 27,665,792 shares issued as of March 31, 2024 and December 31, 2023, respectively	286	280
Additional paid-in capital	474,433	472,692
Accumulated deficit	(125,609)	(102,425)
Shares held in treasury of 793,652 and 418,014 as of March 31, 2024 and December 31, 2023, respectively, at cost	(8,071)	(4,221)
Accumulated other comprehensive income, net of tax	7,506	7,577
Total stockholders equity	348,545	373,903
Noncontrolling interests in subsidiaries	321	321
Total equity	348,866	374,224
Total liabilities and equity	$ 744,846	$ 780,336

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Trade receivables, allowance for credit loss	$ 4,546	$ 4,543
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	60,000,000	60,000,000
Common stock, shares issued (in shares)	28,395,684	27,665,792
Shares held in treasury (in shares)	793,652	418,014

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Statements of Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Operating Revenues	$ 62,770	$ 61,209
Costs and Expenses:
Operating	48,099	38,509
Administrative and general	11,917	11,632
Lease expense	481	720
Depreciation and amortization	12,882	13,762
Costs and expenses	73,379	64,623
(Losses) Gains on Asset Dispositions and Impairments, Net	(1)	3,599
Operating (Loss) Income	(10,610)	185
Other Income (Expense):
Interest income	593	460
Interest expense	(10,309)	(8,788)
Derivative losses, net	(543)	0
Foreign currency losses, net	(80)	(825)
Other, net	(95)	0
Nonoperating income expense	(10,434)	(9,153)
Loss Before Income Tax Expense and Equity in (Losses) Earnings of 50% or Less Owned Companies	(21,044)	(8,968)
Income Tax Expense	925	1,157
Loss Before Equity in (Losses) Earnings of 50% or Less Owned Companies	(21,969)	(10,125)
Equity in (Losses) Earnings of 50% or Less Owned Companies	(1,100)	536
Net Loss	$ (23,069)	$ (9,589)
Net Loss Per Share:
Basic	$ (0.84)	$ (0.36)
Diluted	$ (0.84)	$ (0.36)
Weighted Average Common Stock and Warrants Outstanding:
Basic	27,343,604	26,822,391
Diluted	27,343,604	26,822,391

Unaudited Condensed Consolida_2

Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net Loss	$ (23,069)	$ (9,589)
Other Comprehensive (Loss) Income:
Foreign currency translation (losses) gains	(71)	668
Derivative gains on cash flow hedges	0	14
Other comprehensive (loss) income	(71)	516
Income Tax Expense	0	0
Other comprehensive (loss) income, net	(71)	516
Comprehensive Loss	(23,140)	(9,073)
Interest Expense
Other Comprehensive (Loss) Income:
Reclassification of derivative gains on cash flow hedges to interest expense	$ 0	$ (166)

Unaudited Condensed Consolida_3

Unaudited Condensed Consolidated Statements of Changes In Equity - USD ($) $ in Thousands	Total	Performance Stock [Member]	Common Stock [Member]	Common Stock [Member] Performance Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Treasury Stock [Member] Performance Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]	Non-Controlling Interests In Subsidiaries [Member]
Balance at Dec. 31, 2022	$ 379,146		$ 272		$ 466,669	$ (1,852)		$ (93,111)	$ 6,847	$ 321
Balance (in shares) at Dec. 31, 2022			26,702,161			248,638
Restricted stock grants	6		$ 6
Restricted stock grants (in shares)			520,396
Amortization of share awards	1,221				1,221
Exercise of options	6				6
Exercise of options (in shares)			834
Exercise of warrants			$ 1			$ (1)
Exercise of warrants (in shares)			117,394			121
Restricted stock vesting	(2,266)					$ (2,266)
Restricted stock vesting (in shares)			(220,207)			220,207
Forfeiture of employee share awards (in shares)			(15,000)
Net Loss	(9,589)							(9,589)
Other comprehensive (loss) income	516								516
Balance at Mar. 31, 2023	369,040		$ 279		467,896	$ (4,119)		(102,700)	7,363	321
Balance (in shares) at Mar. 31, 2023			27,105,578			468,966
Balance at Dec. 31, 2023	$ 374,224		$ 280		472,692	$ (4,221)		(102,425)	7,577	321
Balance (in shares) at Dec. 31, 2023	27,665,792		27,184,778			481,014
Restricted stock grants	$ 6		$ 6
Restricted stock grants (in shares)			563,271
Amortization of share awards	1,639				1,639
Exercise of options	$ 102				102
Exercise of options (in shares)	9,166		9,166
Restricted stock vesting	$ (3,081)	$ (769)				$ (3,081)	$ (769)
Restricted stock vesting (in shares)			(251,333)	96,150		251,333	61,305
Net Loss	(23,069)							(23,069)
Other comprehensive (loss) income	(186)							(115)	(71)
Balance at Mar. 31, 2024	$ 348,866		$ 286		$ 474,433	$ (8,071)		$ (125,609)	$ 7,506	$ 321
Balance (in shares) at Mar. 31, 2024	28,395,684		27,602,032			793,652

Unaudited Condensed Consolida_4

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash Flows from Operating Activities:
Net Loss	$ (23,069)	$ (9,589)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	12,882	13,762
Deferred financing costs amortization	295	418
Stock-based compensation expense	1,645	1,227
Debt discount amortization	1,926	1,558
Allowance for credit losses	3	(104)
Loss (gain) from equipment sales, retirements or impairments	1	(3,599)
Derivative losses	543	0
Interest on finance leases	0	72
Settlement on derivative transactions, net	164	154
Currency losses	80	825
Deferred income taxes	(1,845)	(1,659)
Equity losses (earnings)	1,100	(536)
Changes in Operating Assets and Liabilities:
Accounts receivables	4,291	(9,857)
Other assets	(1,290)	45
Accounts payable and accrued liabilities	(3,895)	6,731
Net cash used in operating activities	(7,169)	(552)
Cash Flows from Investing Activities:
Purchases of property and equipment	(3,416)	(470)
Proceeds from disposition of property and equipment	0	7,611
Principal payments on notes due from others	0	5,000
Net cash (used in) provided by investing activities	(3,416)	12,141
Cash Flows from Financing Activities:
Payments on long-term debt	(7,530)	(8,608)
Payments on finance leases	(9)	(114)
Proceeds from exercise of stock options	0	6
Tax withholdings on restricted stock vesting and director share awards	(3,850)	(2,266)
Net cash used in financing activities	(11,389)	(10,982)
Effects of Exchange Rate Changes on Cash, Restricted Cash and Cash Equivalents	2	0
Net Change in Cash, Restricted Cash and Cash Equivalents	(21,972)	607
Cash, Restricted Cash and Cash Equivalents, Beginning of Period	84,131	43,045
Cash, Restricted Cash and Cash Equivalents, End of Period	62,159	43,652
Supplemental disclosures:
Cash paid for interest, excluding capitalized interest	6,062	5,955
Income taxes paid, net	0	446
Noncash Investing and Financing Activities:
Increase in capital expenditures in accounts payable and accrued liabilities	133	51
Recognition of a new right-of-use asset - operating leases	$ 0	$ 196

Insider Trading Arrangements

Insider Trading Arrangements - Directors or Section 16 Officers	3 Months Ended
	Mar. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Basis of Presentation and Accou

Basis of Presentation and Accounting Policies	3 Months Ended
Basis of Presentation and Accounting Policies	Mar. 31, 2024
Basis Of Presentation And Accounting Policies [Abstract]
Basis of Presentation and Accounting Policies	1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES The condensed consolidated financial statements include the accounts of SEACOR Marine Holdings Inc. and its consolidated subsidiaries (the “Company”). In the opinion of management, all adjustments (consisting of normal recurring adjustments) have been made to fairly present the unaudited condensed consolidated financial statements for the periods indicated. Results of operations for the interim periods presented are not necessarily indicative of operating results for the full year or any future periods. Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) have been condensed or omitted. These condensed consolidated financial statements should be read in conjunction with the Company’s financial statements and related notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023 (the “2023 Annual Report”). Unless the context otherwise indicates, any reference in this Quarterly Report on Form 10-Q to the “Company” refers to SEACOR Marine Holdings Inc. and its consolidated subsidiaries, and any reference in this Quarterly Report on Form 10-Q to “SEACOR Marine” refers to SEACOR Marine Holdings Inc. without its consolidated subsidiaries. Recently Issued Accounting Standards. On December 14, 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which requires public entities to disclose information about their effective tax rate reconciliation and information on income taxes paid. The guidance is effective for fiscal years beginning after December 15, 2024. While early adoption is permitted, the Company has determined it will not early adopt the standard. The Company has not yet determined the impact that the adoption of the standard will have on the Company’s consolidated financial position, results of operations and disclosures. On November 27, 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which requires public entities to disclose information about their reportable segments’ significant expenses on an interim and annual basis. The guidance is effective for fiscal years beginning after December 15, 2023 and interim periods within the fiscal years beginning after December 15, 2024. While early adoption is permitted, the Company has determined it will not early adopt the standard. The Company has not yet determined the impact that the adoption of the standard will have on the Company’s consolidated financial position, results of operations and disclosures. On October 9, 2023, the FASB issued ASU 2023-06, Disclosure Improvements: Codification Amendments in Response to the United States Securities and Exchange Commission’s (“SEC”) Disclosure Update and Simplification Initiative, which amends the disclosure or presentation requirements related to various subtopics in the FASB Accounting Standards Codification. The effective date is contingent on when the SEC removes the related disclosure from Regulation S-X or Regulation S-K, with early adoption prohibited. The Company does not believe the adoption of the standard will have a material effect on the disclosures included herein. Accounting Policies. Basis of Consolidation. The consolidated financial statements include the accounts of SEACOR Marine and its controlled subsidiaries. Control is generally deemed to exist if the Company has greater than 50 % of the voting rights of a subsidiary. All significant intercompany accounts and transactions are eliminated in the combination and consolidation. Noncontrolling interests in consolidated subsidiaries are included in the consolidated balance sheets as a separate component of equity. The Company reports consolidated net income (loss) inclusive of both the Company’s and the noncontrolling interests’ share, as well as the amounts of consolidated net income (loss) attributable to each of the Company and the noncontrolling interests. If a subsidiary is deconsolidated upon a change in control, any retained noncontrolling equity investment in the former controlled subsidiary is measured at fair value and a gain or loss is recognized in net income (loss) based on such fair value. If a subsidiary is consolidated upon the business acquisition of controlling interests by the Company, any previous noncontrolled equity investment in the subsidiary is measured at fair value and a gain or loss is recognized in net income (loss) based on such fair value. The Company employs the equity method of accounting for investments in 50% or less owned companies that it does not control but has the ability to exercise significant influence over the operating and financial policies of the business venture. Significant influence is generally deemed to exist if the Company has between 20 % and 50 % of the voting rights of a business venture but may exist when the Company’s ownership percentage is less than 20%. In certain circumstances, the Company may have an economic interest in excess of 50% but may not control and consolidate the business venture. Conversely, the Company may have an economic interest less than 50% but may control and consolidate the business venture. The Company reports its investments in and advances to these business ventures in the accompanying consolidated balance sheets as investments, at equity, and advances to 50% or less owned companies. The Company reports its share of earnings from investments in 50% or less owned companies in the accompanying consolidated statements of income (loss) as equity in earnings of 50% or less owned companies, net of tax. Certain reclassifications were made to previously reported amounts in the consolidated financial statements and notes thereto to make them consistent with the current period presentation. Use of Estimates. The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“U.S.”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from estimates and those differences may be material. Revenue Recognition . Revenue is recognized when (or as) the Company transfers promised goods or services to its customers in amounts that reflect the consideration to which the Company expects to be entitled to in exchange for those goods or services, which occurs when (or as) the Company satisfies its contractual obligations and transfers over control of the promised goods or services to its customers. The Company recognizes revenue, net of sales taxes, based on its estimates of the consideration the Company expects to receive. Costs to obtain or fulfill a contract are expensed as incurred. The Company earns revenue primarily from the time charter and bareboat charter of vessels to customers. Since the Company charges customers based upon daily rates of hire, vessel revenues are recognized on a daily basis throughout the contract period. Under a time charter, the Company provides a vessel to a customer and is responsible for all operating expenses, typically excluding fuel. Under a bareboat charter, the Company provides a vessel to a customer and the customer assumes responsibility for all operating expenses and assumes all risks of operation. In the U.S. Gulf of Mexico, time charter durations and rates are typically established in the context of master service agreements that govern the terms and conditions of the charter. In the Company’s operating areas, contracts or charters vary in length from several days to multi-year periods. Many of the Company’s contracts and charters include cancellation clauses without early termination penalties. As a result of cancellations, options and frequent renewals, the stated duration of charters may not correlate with the length of time the vessel is contracted for to provide services to a particular customer. The Company contracts with various customers to carry out management services for vessels as agents for and on behalf of ship owners. These services include crew management, technical management, commercial management, insurance arrangements, sale and purchase of vessels, provisions and bunkering. As the manager of the vessels, the Company undertakes to use its best endeavors to provide the agreed management services as agents for and on behalf of the owners in accordance with sound ship management practice and to protect and promote the interest of the owners in all matters relating to the provision of services thereunder. The Company also contracts with various customers to carry out management services regarding engineering for vessel construction and vessel conversions. The vast majority of the ship management agreements span one to three years and are typically billed on a monthly basis. The Company transfers control of the service to the customer and satisfies its performance obligation over the term of the contract, and therefore recognizes revenue over the term of the contract while related costs are expensed as incurred. Revenue that does not meet these criteria is deferred until the criteria is met and is considered a contract liability and is recognized as such. Contract liabilities, which are included in unearned revenue in the accompanying consolidated balance sheets, as of March 31, 2024 and December 31, 2023 were as follows (in thousands): 2024 2023 Balance at beginning of period $ 687 $ 2,333 Unearned revenues during the period 2,785 6,501 Revenues recognized during the period ( 1,415 ) ( 8,147 ) Balance at end of period $ 2,057 $ 687 As of March 31, 2024 and December 31, 2023 , the Company had unearned revenue of $ 2.1 million and $ 0.7 million, respectively, primarily related to mobilization of vessels. Direct Operating Expenses. Direct operating costs and expenses, other than leased-in equipment expense, consist primarily of costs and expenses such as: personnel; repairs and maintenance; drydocking; insurance and loss reserves; fuel, lubes and supplies; and other expenses, which include costs such as brokers’ commissions, communication costs, expenses incurred in mobilizing vessels between geographic regions, third party ship management fees, freight expenses, and customs and importation duties. Direct operating costs are expensed as incurred. Cash and Cash Equivalents. The Company considers all highly liquid investments, with an original maturity of three months or less from the date purchased, to be cash equivalents. Restricted Cash. Restricted cash primarily relates to banking facility requirements. Trade and Other Receivables and Allowance for Credit Losses. Customers are primarily major integrated national, international oil companies, large independent oil and natural gas exploration and production companies and established wind farm construction companies. Customers are granted credit on a short-term basis and the related credit risks are minimal. Other receivables consist primarily of operating expenses the Company incurs in relation to vessels it manages for other entities, as well as insurance and income tax receivables. The Company routinely reviews its receivables and makes provisions for expected credit losses utilizing the Current Expected Credit Losses model (“CECL”). The CECL model utilizes a lifetime expected credit loss measurement objective for the recognition of credit losses for loans and other receivables at the time the financial asset is originated or acquired. However, those provisions are estimates and actual results may materially differ from those estimates. After collection efforts have been exhausted, trade receivables that are deemed uncollectible are removed from both accounts receivable and the allowance for credit losses. Property and Equipment. Equipment, stated at cost, is depreciated using the straight-line method over the estimated useful life of the asset to an estimated salvage value. With respect to each class of asset, the estimated useful life is based upon a newly built asset being placed into service and represents the time period beyond which it is typically not justifiable for the Company to continue to operate the asset in the same or similar manner. From time to time, the Company may acquire older vessels that have already exceeded the Company’s useful life policy, in which case the Company depreciates such assets based on its best estimate of the asset’s remaining useful life, typically the period until the next survey or certification date. As of March 31, 2024 , the estimated useful life of the Company’s new offshore support vessels was 20 years. Equipment maintenance and repair costs and the costs of routine overhauls, drydockings and inspections performed on vessels and equipment are charged to operating expense as incurred. Expenditures that extend the useful life or improve the marketing and commercial characteristics of equipment as well as major renewals and improvements to other properties are capitalized. Certain interest costs incurred during the construction of equipment are capitalized as part of the assets’ carrying values and are amortized over such assets’ estimated useful lives. There was no capitalized interest recognized during the three months ended March 31, 2024 and 2023 . Assets Held for Sale. As of March 31, 2024, one anchor handling towing supply vessel (“AHTS”) previously included in the Africa and Europe segment, with a carrying value of $ 0.5 million, was classified as assets held for sale as the Company expects to sell the vessel within one year. Impairment of Long-Lived Assets. The Company performs an impairment analysis of long-lived assets used in operations when indicators of impairment are present. These indicators may include a significant decrease in the market price of a long-lived asset or asset group, a significant adverse change in the extent or manner in which a long-lived asset or asset group is being used or in its physical condition, or a current period operating or cash flow loss combined with a history of operating or cash flow losses or a forecast that demonstrates continuing losses associated with the use of a long-lived asset or asset group. If the carrying values of the assets are not recoverable, as determined by their estimated future undiscounted cash flows, the estimated fair value of the assets or asset groups are compared to their current carrying values and impairment charges are recorded if the carrying value exceeds fair value. During the three months ended March 31, 2024 and 2023 , the Company did no t record impairment charges on any owned or leased-in vessels. Impairment charges are included in gains (losses) on asset dispositions and impairments in the accompanying consolidated statements of income (loss). Estimated fair values for the Company owned vessels were established by independent appraisers based on researched market information, replacement cost information and other data. For vessel classes and individual vessels with indicators of impairment as of March 31, 2024, the Company estimated that their future undiscounted cash flows exceeded their current carrying values. However, the Company’s estimates of future undiscounted cash flows are highly subjective as utilization and rates per day worked are uncertain, especially in light of the continued volatility in commodity prices as well as the timing and cost of reactivating cold-stacked vessels. If market conditions decline, changes in the Company’s expectations on future cash flows may result in recognizing additional impairment charges related to its long-lived assets in future periods. For any vessel or vessel class that has indicators of impairment and is deemed not recoverable through future operations, the Company determines the fair value of the vessel or vessel class. If the fair value determination is less than the carrying value of the vessel or vessel class, an impairment is recognized to reduce the carrying value to fair value. Fair value determination is primarily accomplished by obtaining independent valuations of vessel or vessel classes from qualified third-party appraisers. Impairment of 50% or Less Owned Companies. Investments in 50% or less owned companies are reviewed periodically to assess whether there is an other-than-temporary decline in the carrying value of the investment. In its evaluation, the Company considers, among other items, recent and expected financial performance and returns, impairments recorded by the investee and the capital structure of the investee. When the Company determines the estimated fair value of an investment is below carrying value and the decline is other-than-temporary, the investment is written down to its estimated fair value. Actual results may vary from the Company’s estimates due to the uncertainty regarding projected financial performance, the severity and expected duration of declines in value and the available liquidity in the capital markets to support the continuing operations of the investee, among other factors. Although the Company believes its assumptions and estimates are reasonable, the investee’s actual performance compared with the estimates could produce different results and lead to additional impairment charges in future periods. During the three months ended March 31, 2024 and 2023 , the Company did no t recognize any impairment charges related to its 50% or less owned companies. Income Taxes. During the three months ended March 31, 2024 , the Company’s effective income tax rate of 4.4 % was primarily due to foreign taxes paid that are not creditable against U.S. income taxes and foreign losses for which there is no benefit for U.S. income tax purposes. Accumulated Other Comprehensive Income (Loss). The components of accumulated other comprehensive income were as follows (in thousands): SEACOR Marine Holdings Inc. Foreign Derivative Total Other December 31, 2023 $ 7,577 $ — $ 7,577 Other comprehensive loss ( 71 ) — ( 71 ) Balance as of March 31, 2024 $ 7,506 $ — $ 7,506 Earnings ( Loss) Per Share. Basic earnings/loss per share of Common Stock of SEACOR Marine is computed based on the weighted average number of shares of Common Stock and warrants to purchase Common Stock at an exercise price of $ 0.01 per share (“Warrants”) issued and outstanding during the relevant periods. The Warrants are included in the basic earnings/loss per share of Common Stock because the shares issuable upon exercise of the Warrants are issuable for de minimis cash consideration and therefore not anti-dilutive. Diluted earnings/loss per share of Common Stock is computed based on the weighted average number of shares of Common Stock and Warrants issued and outstanding plus the effect of other potentially dilutive securities through the application of the treasury stock method and the if-converted method that assumes all shares of Common Stock have been issued and outstanding during the relevant periods pursuant to the conversion of the New Convertible Notes unless anti-dilutive. For the three months ended March 31, 2024 and 2023 , diluted loss per share of Common Stock excluded 2,978,724 shares of Common Stock issuable upon conversion of the New Convertible Notes as the effect of their inclusion in the computation would be anti-dilutive. In addition, for the three months ended March 31, 2024 and 2023 diluted loss per share of Common Stock excluded 1,378,797 and 1,672,932 shares of restricted stock, respectively, and 1,016,865 and 1,026,031 shares of Common Stock, respectively, issuable upon exercise of outstanding stock options, as the effect of their inclusion in the computation would be anti-dilutive.

Equipment Acquisitions and Disp

Equipment Acquisitions and Dispositions	3 Months Ended
Equipment Acquisitions and Dispositions	Mar. 31, 2024
Property, Plant and Equipment [Abstract]
Equipment Acquisitions and Dispositions	2. EQUIPMENT ACQUISITIONS AND DISPOSITIONS During the three months ended March 31, 2024, capital expenditures were $ 3.4 million and there were no equipment deliveries and no vessel sales. During the three months ended March 31, 2023 , the Company sold three liftboats and other equipment, previously classified as held for sale, as well as other equipment not previously classified as such, for net cash proceeds of $ 7.6 million, after transaction costs, and a gain of $ 2.6 million.

Investments, at Equity, and Adv

Investments, at Equity, and Advances to 50% or Less Owned Companies	3 Months Ended
	Mar. 31, 2024
Schedule of Investments [Abstract]
Investments, at Equity, and Advances to 50% or Less Owned Companies	3. INVESTMENTS, AT EQUITY AND ADVANCES TO 50% OR LESS OWNED COMPANIES Investments, at equity, and advances to 50% or less owned companies as of March 31, 2024 and December 31, 2023 were as follows (in thousands): Ownership 2024 2023 Seabulk Angola 49.0 % $ 974 $ 1,668 SEACOR Marine Arabia 45.0 % 2,078 2,385 Other 20.0 % - 50.0 % 70 72 $ 3,122 $ 4,125

Long Term Debt

Long Term Debt	3 Months Ended
Long Term Debt	Mar. 31, 2024
Debt Disclosure [Abstract]
Long Term Debt	4. LONG-TERM DEBT The Company’s long-term debt obligations as of March 31, 2024 and December 31, 2023 were as follows (in thousands): March 31, 2024 December 31, 2023 Guaranteed Notes $ 90,000 $ 90,000 New Convertible Notes 35,000 35,000 2023 SMFH Credit Facility 115,900 118,950 Sea-Cat Crewzer III Term Loan Facility 12,990 14,227 SEACOR Delta Shipyard Financing 66,424 68,647 SEACOR Alpine Credit Facility 25,180 26,200 Total principal due for long-term debt 345,494 353,024 Current portion due within one year ( 28,605 ) ( 28,365 ) Unamortized debt discount ( 30,959 ) ( 32,885 ) Deferred financing costs ( 3,941 ) ( 4,230 ) Long-term debt, less current portion $ 281,989 $ 287,544 As of March 31, 2024, the Company was in compliance with all debt covenants and lender requirements. Letters of Credit . As of March 31, 2024 , the Company had outstanding letters of credit of $ 0.4 million securing lease obligations, labor and performance guaranties.

Leases

Leases	3 Months Ended
Leases	Mar. 31, 2024
Leases [Abstract]
Leases	5. LEASES As of March 31, 2024 , the Company leased-in one AHTS and certain facilities and other equipment. The leases typically contain purchase and renewal options or rights of first refusal with respect to the sale or lease of the equipment. As of March 31, 2024 , the remaining lease term of the vessel had a duration of six months . The lease terms of certain facilities and other equipment had a duration ranging from 11 to 273 months. As of March 31, 2024, future minimum payments for leases for the remainder of 2024 and the years ended December 31, noted below, were as follows (in thousands): Operating Leases Finance Leases Remainder of 2024 $ 1,332 $ 27 2025 746 6 2026 459 — 2027 400 — 2028 341 — Years subsequent to 2028 2,872 — 6,150 33 Interest component ( 1,475 ) — 4,675 33 Current portion of long-term lease liabilities 1,285 33 Long-term lease liabilities $ 3,390 $ — For the three months ended March 31, 2024 and 2023 the components of lease expense were as follows (in thousands): Three Months Ended March 31, 2024 2023 Operating lease costs $ 394 $ 546 Finance lease costs: Amortization of finance lease assets (1) 10 160 Interest on finance lease liabilities (2) — 72 Short-term lease costs 87 174 $ 491 $ 952 (1) Included in amortization costs in the consolidated statements of income (loss) . (2) Included in interest expense in the consolidated statements of income (loss) . For the three months ended March 31, 2024 supplemental cash flow information related to leases was as follows (in thousands): 2024 Operating cash outflows from operating leases $ 519 Financing cash outflows from finance leases 9 Right-of-use assets obtained for operating lease liabilities — Right-of-use assets obtained for finance lease liabilities — For the three months ended March 31, 2024 other information related to leases was as follows: 2024 Weighted average remaining lease term, in years - operating leases 10.6 Weighted average remaining lease term, in years - finance leases 0.9 Weighted average discount rate - operating leases 6.5 % Weighted average discount rate - finance leases 4.0 %

Income Taxes

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	6. INCOME TAXES The following table reconciles the difference between the statutory federal income tax rate for the Company and the effective income tax rate for the three months ended March 31, 2024: Statutory rate ( 21.0 )% Income (loss) of foreign subsidiaries not includable in U.S. return and foreign withholding tax 19.9 % 162(m) - Executive compensation 5.9 % Other ( 0.4 )% Effective income tax rate 4.4 %

Derivative Instruments and Hedg

Derivative Instruments and Hedging Strategies	3 Months Ended
Derivative Instruments and Hedging Strategies	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Strategies	7. DERIVATIVE INSTRUMENTS AND HEDGING STRATEGIES Derivative instruments are classified as either assets, which are included in other receivables in the accompanying consolidated balance sheets, or liabilities based on their individual fair values. The fair values of the Company’s derivative instruments were as follows (in thousands): March 31, 2024 December 31, 2023 Derivative Derivative Derivative Derivative Derivatives not designated as hedging instruments: Forward Exchange Contract $ — $ 99 $ 608 $ — Economic Hedges. The Company may enter and settle forward currency exchange, option and future contracts with respect to various foreign currencies. These contracts enable the Company to buy currencies in the future at fixed exchange rates, which could offset possible consequences of changes in currency exchange rates with respect to the Company’s business conducted outside of the U.S. The Company generally does not enter into contracts with forward settlement dates beyond 12 to 18 months. During the fourth quarter of 2023, the Company entered into a forward exchange contract related to the purchase of hybrid battery power systems, the purchase price for which is denominated in Norwegian Kroner. During the three months ended March 31, 2024 , the Company recognized losses of $ 0.5 million on this contract which were recognized in earnings. Cash Flow Hedges. The Company may from time to time enter into interest rate swap agreements designated as cash flow hedges. By entering into interest rate swap agreements, the Company can convert the variable interest component of certain of their outstanding borrowings to a fixed interest rate. The Company recognized losses on derivative instruments designated as cash flow hedges of $ 0.2 million for the three months ended March 31, 2023 as a component of other comprehensive income (loss). As of March 31, 2024, there were no interest rate swaps held by the Company. Other Derivative Instruments. The Company had no derivative instruments not designated as hedging instruments for the three months ended March 31, 2023 and recognized gains on derivative instruments not designated as hedging instruments for the three months ended March 31, 2024 as follows (in thousands): Three Months Ended March 31, 2024 2023 Forward currency exchange, option, and future contracts $ 543 $ — The forward currency exchange contract relates to the purchase of hybrid battery power systems discussed in economic hedges above.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
Fair Value Measurements	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurements	8. FAIR VALUE MEASUREMENTS The fair value of an asset or liability is the price that would be received to sell an asset or transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company utilizes a fair value hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value and defines three levels of inputs that may be used to measure fair value. Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Level 2 inputs are observable inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets, quoted prices in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, or inputs derived from observable market data. Level 3 inputs are unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities. The Company’s financial assets and liabilities as of March 31, 2024 and December 31, 2023 that are measured at fair value on a recurring basis were as follows (in thousands): March 31, 2024 Level 1 Level 2 Level 3 LIABILITIES Derivative instruments $ — $ 99 $ — December 31, 2023 ASSETS Derivative instruments $ — $ 608 $ — The fair value of the Company’s derivative instruments was estimated by utilizing a spot rate as of the measurement date provided by an independent third party. The estimated fair values of the Company’s other financial assets and liabilities as of March 31, 2024 and December 31, 2023 were as follows (in thousands): Estimated Fair Value March 31, 2024 Carrying Level 1 Level 2 Level 3 ASSETS Cash, cash equivalents and restricted cash $ 62,159 $ 62,159 $ — $ — LIABILITIES Long-term debt, including current portion 310,594 — 305,027 — December 31, 2023 ASSETS Cash, cash equivalents and restricted cash $ 84,131 $ 84,131 $ — $ — LIABILITIES Long-term debt, including current portion 315,909 — 307,653 — The carrying value of cash, cash equivalents, restricted cash and trade receivables approximates fair value. The fair value of the Company’s long-term debt was estimated based upon quoted market prices or by using discounted cash flow analysis based on estimated current rates for similar types of arrangements. Considerable judgment was required in developing certain of the estimates of fair value, and, accordingly, the estimates presented herein are not necessarily indicative of the amounts that the Company could realize in a current market exchange. Property and equipment . During the three months ended March 31, 2024 , the Company recognized no impairment charges. During the year ended December 31, 2023 , the Company recognized impairment charges totaling $ 0.7 million for one leased-in AHTS to adjust for indicative cash flows and the cost to return the vessel to its owner.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	9. COMMITMENTS AND CONTINGENCIES As of March 31, 2024 , the Company had unfunded capital commitments of $ 12.5 million for miscellaneous vessel equipment, including $ 10.5 million in respect of hybrid battery power systems. Of the unfunded capital commitments, $ 7.3 million is payable during 2024 and $ 5.2 million is payable during 2025. The Company has indefinitely deferred an additional $ 9.2 million of orders with respect to one fast support vessel. In December 2015, the Brazilian Federal Revenue Office issued a tax-deficiency notice to Seabulk Offshore do Brasil Ltda, an indirect wholly-owned subsidiary of SEACOR Marine (“Seabulk Offshore do Brasil”), with respect to certain profit participation contributions (also known as “PIS”) and social security financing contributions (also known as “COFINS”) requirements alleged to be due from Seabulk Offshore do Brasil (“Deficiency Notice”) in respect of the period of January 2011 until December 2012. In January 2016, the Company administratively appealed the Deficiency Notice on the basis that, among other arguments, (i) such contributions were not applicable in the circumstances of a 70 %/ 30 % cost allocation structure, and (ii) the tax inspector had incorrectly determined that values received from outside of Brazil could not be classified as expense refunds. The initial appeal was dismissed by the Brazilian Federal Revenue Office and the Company appealed such dismissal and is currently awaiting an administrative trial. A local Brazilian law has been enacted that supports the Company’s position that such contribution requirements are not applicable, but it is uncertain whether such law will be taken into consideration with respect to administrative proceedings commenced prior to the enactment of the law. Accordingly, the success of Seabulk Offshore do Brasil in the administrative proceedings cannot be assured and the matter may need to be addressed through judicial court proceedings. The potential levy arising from the Deficiency Notice is R$ 23.9 million based on a historical potential levy of R$ 12.87 million (USD $ 4.8 million and USD $ 2.6 million, respectively, based on the exchange rate as of March 31, 2024). In the normal course of its business, the Company becomes involved in various other litigation matters including, among others, claims by third parties for alleged property damages and personal injuries. Management has used estimates in determining the Company’s potential exposure to these matters and has recorded reserves in its financial statements related thereto where appropriate. It is possible that a change in the Company’s estimates of that exposure could occur, but the Company does not expect that such changes in estimated costs would have a material effect on the Company’s consolidated financial position, results of operations or cash flows. Certain of the Company’s subsidiaries are participating employers in two industry-wide, multi-employer, defined benefit pension funds in the United Kingdom: the U.K Merchant Navy Officers Pension Fund (“MNOPF”) and the U.K. Merchant Navy Ratings Pension Fund (“MNRPF”). The Company’s participation in the MNOPF began with the acquisition of the Stirling group of companies (the “Stirling Group”) in 2001 and relates to certain officers employed between 1978 and 2002 by the Stirling Group and/or its predecessors. The Company’s participation in the MNRPF also began with the acquisition of the Stirling Group in 2001 and relates to ratings employed by the Stirling Group and/or its predecessors through today. Both of these plans are in deficit positions and, depending upon the results of future actuarial valuations, it is possible that the plans could experience funding deficits that will require the Company to recognize payroll related operating expenses in the periods invoices are received. As of March 31, 2024, all invoices related to MNOPF and MNRPF have been settled in full. On October 19, 2021, the Company was informed by the MNRPF that two issues had been identified during a review of the MNRPF by the applicable trustee that would potentially give rise to material additional liabilities for the MNRPF. On November 23, 2023, the trustee advised that following the tri-annual valuation, $ 1.5 million (£ 1.2 million) of the potential cumulative funding deficit of the MNRPF was allocated to the Company as a participating employer, including the additional liabilities mentioned above. During 2023, the Company recognized payroll related operating expenses of $ 1.5 million (£ 1.2 million) for its allocated share of the potential cumulative funding deficit, which the Company will be invoiced for during 2024 and 2025. On April 30, 2024, the Company was informed by the MNRPF that the Company’s allocated share of the potential cumulative funding deficit may be reduced due to changes in valuation assumptions. The MNRPF further advised that the final results of the valuation must be determined by the trustee by June 30, 2024, after which the Company and the other participating employers would be notified of their respective final allocation of such funding deficit.

Stock Based Compensation

Stock Based Compensation	3 Months Ended
Stock Based Compensation	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
Stock Based Compensation	10. STOCK BASED COMPENSATION Transactions in connection with the Company’s Equity Incentive Plans during the three months ended March 31, 2024 were as follows: Restricted Stock Activity: Outstanding as of December 31, 2023 1,642,084 Granted 563,271 Vested (1) ( 826,618 ) Forfeited — Outstanding as of March 31, 2024 (2) 1,378,737 Stock Option Activity: Outstanding as of December 31, 2023 1,026,031 Granted — Exercised ( 9,166 ) Forfeited — Outstanding as of March 31, 2024 1,016,865 (1) Includes 157,455 vested grants of performance-based stock. (2) Includes 184,930 grants of performance-based stock that satisfied the performance obligation and are therefore likely to vest and excludes 357,520 grants of performance-based stock units that are not considered outstanding until such time that they become probable to vest. For the three months ended March 31, 2024 , the Company acquired for treasury (i) 251,333 shares of Common Stock from its employees to cover their tax withholding obligations upon the lapsing of restrictions on share awards for an aggregate purchase price of $ 3.1 million, and (ii) 61,305 shares of Common Stock from its employees to cover their tax withholding obligations upon the lapsing of restrictions on performance-based share awards for an aggregate purchase price of $ 0.8 million. These shares were purchased in accordance with the terms of the Company’s 2020 Equity Incentive Plan and 2022 Equity Incentive Plan, as applicable.

Segment Information

Segment Information	3 Months Ended
Segment Information	Mar. 31, 2024
Segment Reporting [Abstract]
Segment Information	11. SEGMENT INFORMATION The Company’s segment presentation and basis of measurement of segment profit or loss are as previously described in the 2023 Annual Report. The following tables summarize the operating results, capital expenditures and assets of the Company’s reportable segments for the periods indicated (in thousands): United Africa Middle Latin Total For the Three Months Ended March 31, 2024 Operating Revenues: Time charter $ 6,957 $ 20,555 $ 16,477 $ 15,274 $ 59,263 Bareboat charter — — — 364 364 Other marine services 1,026 169 350 1,598 3,143 7,983 20,724 16,827 17,236 62,770 Direct Costs and Expenses: Operating: Personnel 5,781 5,181 5,963 4,745 21,670 Repairs and maintenance 1,404 3,209 2,712 2,438 9,763 Drydocking 1,968 2,032 1,483 1,223 6,706 Insurance and loss reserves 396 334 618 390 1,738 Fuel, lubes and supplies 667 1,287 1,198 1,371 4,523 Other ( 171 ) 2,199 1,000 671 3,699 10,045 14,242 12,974 10,838 48,099 Direct Vessel (Loss) Profit $ ( 2,062 ) $ 6,482 $ 3,853 $ 6,398 14,671 Other Costs and Expenses: Lease expense $ 138 $ 178 $ 85 $ 80 481 Administrative and general 11,917 Depreciation and amortization 2,750 3,915 3,496 2,721 12,882 25,280 Losses on asset dispositions and impairments, net ( 1 ) Operating loss $ ( 10,610 ) As of March 31, 2024 Property and Equipment: Historical Cost $ 163,373 $ 292,292 $ 267,401 $ 196,073 $ 919,139 Accumulated Depreciation ( 85,334 ) ( 100,578 ) ( 98,203 ) ( 52,886 ) ( 337,001 ) $ 78,039 $ 191,714 $ 169,198 $ 143,187 $ 582,138 Total Assets (1) $ 107,976 $ 223,985 $ 193,756 $ 161,590 $ 687,307 (1) Total Assets by region does not include corporate assets of $ 57.5 million as of March 31, 2024 . United Africa Middle Latin Total For the Three Months Ended March 31, 2023 Operating Revenues: Time charter $ 6,564 $ 18,996 $ 16,028 $ 13,827 $ 55,415 Bareboat charter — — — 360 360 Other 3,850 225 27 1,332 5,434 10,414 19,221 16,055 15,519 61,209 Direct Costs and Expenses: Operating: Personnel 6,535 4,505 4,841 3,922 19,803 Repairs and maintenance 1,194 2,553 677 1,587 6,011 Drydocking 43 1,184 ( 1,095 ) ( 119 ) 13 Insurance and loss reserves 1,041 318 1,185 245 2,789 Fuel, lubes and supplies 783 2,215 1,142 679 4,819 Other 231 2,749 1,496 598 5,074 9,827 13,524 8,246 6,912 38,509 Direct Vessel Profit $ 587 $ 5,697 $ 7,809 $ 8,607 22,700 Other Costs and Expenses: Lease expense $ 136 $ 429 $ 76 $ 79 720 Administrative and general 11,632 Depreciation and amortization 3,535 3,925 3,688 2,614 13,762 26,114 Gains on asset dispositions and impairments, net 3,599 Operating income $ 185 As of March 31, 2023 Property and Equipment: Historical Cost $ 208,241 $ 287,168 $ 286,795 $ 187,124 $ 969,328 Accumulated Depreciation ( 99,165 ) ( 96,086 ) ( 93,132 ) ( 35,814 ) ( 324,197 ) $ 109,076 $ 191,082 $ 193,663 $ 151,310 $ 645,131 Total Assets (1) $ 146,209 $ 216,899 $ 213,461 $ 172,575 $ 749,144 (1) Total Assets by region does not include corporate assets of $ 54.4 million as of March 31, 2023 . The Company’s investments in 50 % or less owned companies, which are accounted for under the equity method, also contribute to its consolidated results of operations. As of March 31, 2024, and 2023 , the Company’s investments, at equity and advances to 50 % or less owned companies in its other 50 % or less owned companies were $ 3.1 million and $ 3.6 million, respectively. Equity in (losses) earnings of 50% or less owned companies for the three months ended March 31, 2024 and 2023 were ($ 1.1 ) million and $ 0.5 million, respectively.

Subsequent Events

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2024
Subsequent Events [Abstract]
Subsequent Events	12. SUBSEQUENT EVENTS The Company has evaluated subsequent events through the filing of this Quarterly Report on Form 10-Q and determined that there have been no material events that have occurred that are not properly recognized and/or disclosed in the consolidated financial statements.

Basis of Presentation and Acc_2

Basis of Presentation and Accounting Policies (Policies)	3 Months Ended
Basis of Presentation and Accounting Policies (Policies)	Mar. 31, 2024
Accounting Policies [Abstract]
Recently Issued Accounting Standards	Recently Issued Accounting Standards. On December 14, 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which requires public entities to disclose information about their effective tax rate reconciliation and information on income taxes paid. The guidance is effective for fiscal years beginning after December 15, 2024. While early adoption is permitted, the Company has determined it will not early adopt the standard. The Company has not yet determined the impact that the adoption of the standard will have on the Company’s consolidated financial position, results of operations and disclosures. On November 27, 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which requires public entities to disclose information about their reportable segments’ significant expenses on an interim and annual basis. The guidance is effective for fiscal years beginning after December 15, 2023 and interim periods within the fiscal years beginning after December 15, 2024. While early adoption is permitted, the Company has determined it will not early adopt the standard. The Company has not yet determined the impact that the adoption of the standard will have on the Company’s consolidated financial position, results of operations and disclosures. On October 9, 2023, the FASB issued ASU 2023-06, Disclosure Improvements: Codification Amendments in Response to the United States Securities and Exchange Commission’s (“SEC”) Disclosure Update and Simplification Initiative, which amends the disclosure or presentation requirements related to various subtopics in the FASB Accounting Standards Codification. The effective date is contingent on when the SEC removes the related disclosure from Regulation S-X or Regulation S-K, with early adoption prohibited. The Company does not believe the adoption of the standard will have a material effect on the disclosures included herein.
Basis of Consolidation	Basis of Consolidation. The consolidated financial statements include the accounts of SEACOR Marine and its controlled subsidiaries. Control is generally deemed to exist if the Company has greater than 50 % of the voting rights of a subsidiary. All significant intercompany accounts and transactions are eliminated in the combination and consolidation. Noncontrolling interests in consolidated subsidiaries are included in the consolidated balance sheets as a separate component of equity. The Company reports consolidated net income (loss) inclusive of both the Company’s and the noncontrolling interests’ share, as well as the amounts of consolidated net income (loss) attributable to each of the Company and the noncontrolling interests. If a subsidiary is deconsolidated upon a change in control, any retained noncontrolling equity investment in the former controlled subsidiary is measured at fair value and a gain or loss is recognized in net income (loss) based on such fair value. If a subsidiary is consolidated upon the business acquisition of controlling interests by the Company, any previous noncontrolled equity investment in the subsidiary is measured at fair value and a gain or loss is recognized in net income (loss) based on such fair value. The Company employs the equity method of accounting for investments in 50% or less owned companies that it does not control but has the ability to exercise significant influence over the operating and financial policies of the business venture. Significant influence is generally deemed to exist if the Company has between 20 % and 50 % of the voting rights of a business venture but may exist when the Company’s ownership percentage is less than 20%. In certain circumstances, the Company may have an economic interest in excess of 50% but may not control and consolidate the business venture. Conversely, the Company may have an economic interest less than 50% but may control and consolidate the business venture. The Company reports its investments in and advances to these business ventures in the accompanying consolidated balance sheets as investments, at equity, and advances to 50% or less owned companies. The Company reports its share of earnings from investments in 50% or less owned companies in the accompanying consolidated statements of income (loss) as equity in earnings of 50% or less owned companies, net of tax. Certain reclassifications were made to previously reported amounts in the consolidated financial statements and notes thereto to make them consistent with the current period presentation.
Use of Estimates	Use of Estimates. The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“U.S.”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from estimates and those differences may be material.
Revenue Recognition	Revenue Recognition . Revenue is recognized when (or as) the Company transfers promised goods or services to its customers in amounts that reflect the consideration to which the Company expects to be entitled to in exchange for those goods or services, which occurs when (or as) the Company satisfies its contractual obligations and transfers over control of the promised goods or services to its customers. The Company recognizes revenue, net of sales taxes, based on its estimates of the consideration the Company expects to receive. Costs to obtain or fulfill a contract are expensed as incurred. The Company earns revenue primarily from the time charter and bareboat charter of vessels to customers. Since the Company charges customers based upon daily rates of hire, vessel revenues are recognized on a daily basis throughout the contract period. Under a time charter, the Company provides a vessel to a customer and is responsible for all operating expenses, typically excluding fuel. Under a bareboat charter, the Company provides a vessel to a customer and the customer assumes responsibility for all operating expenses and assumes all risks of operation. In the U.S. Gulf of Mexico, time charter durations and rates are typically established in the context of master service agreements that govern the terms and conditions of the charter. In the Company’s operating areas, contracts or charters vary in length from several days to multi-year periods. Many of the Company’s contracts and charters include cancellation clauses without early termination penalties. As a result of cancellations, options and frequent renewals, the stated duration of charters may not correlate with the length of time the vessel is contracted for to provide services to a particular customer. The Company contracts with various customers to carry out management services for vessels as agents for and on behalf of ship owners. These services include crew management, technical management, commercial management, insurance arrangements, sale and purchase of vessels, provisions and bunkering. As the manager of the vessels, the Company undertakes to use its best endeavors to provide the agreed management services as agents for and on behalf of the owners in accordance with sound ship management practice and to protect and promote the interest of the owners in all matters relating to the provision of services thereunder. The Company also contracts with various customers to carry out management services regarding engineering for vessel construction and vessel conversions. The vast majority of the ship management agreements span one to three years and are typically billed on a monthly basis. The Company transfers control of the service to the customer and satisfies its performance obligation over the term of the contract, and therefore recognizes revenue over the term of the contract while related costs are expensed as incurred. Revenue that does not meet these criteria is deferred until the criteria is met and is considered a contract liability and is recognized as such. Contract liabilities, which are included in unearned revenue in the accompanying consolidated balance sheets, as of March 31, 2024 and December 31, 2023 were as follows (in thousands): 2024 2023 Balance at beginning of period $ 687 $ 2,333 Unearned revenues during the period 2,785 6,501 Revenues recognized during the period ( 1,415 ) ( 8,147 ) Balance at end of period $ 2,057 $ 687 As of March 31, 2024 and December 31, 2023 , the Company had unearned revenue of $ 2.1 million and $ 0.7 million, respectively, primarily related to mobilization of vessels.
Direct Operating Expenses	Direct Operating Expenses. Direct operating costs and expenses, other than leased-in equipment expense, consist primarily of costs and expenses such as: personnel; repairs and maintenance; drydocking; insurance and loss reserves; fuel, lubes and supplies; and other expenses, which include costs such as brokers’ commissions, communication costs, expenses incurred in mobilizing vessels between geographic regions, third party ship management fees, freight expenses, and customs and importation duties. Direct operating costs are expensed as incurred.
Cash and Cash Equivalents	Cash and Cash Equivalents. The Company considers all highly liquid investments, with an original maturity of three months or less from the date purchased, to be cash equivalents.
Restricted Cash	Restricted Cash. Restricted cash primarily relates to banking facility requirements.
Trade and Other Receivables and Allowance for Credit Losses	Trade and Other Receivables and Allowance for Credit Losses. Customers are primarily major integrated national, international oil companies, large independent oil and natural gas exploration and production companies and established wind farm construction companies. Customers are granted credit on a short-term basis and the related credit risks are minimal. Other receivables consist primarily of operating expenses the Company incurs in relation to vessels it manages for other entities, as well as insurance and income tax receivables. The Company routinely reviews its receivables and makes provisions for expected credit losses utilizing the Current Expected Credit Losses model (“CECL”). The CECL model utilizes a lifetime expected credit loss measurement objective for the recognition of credit losses for loans and other receivables at the time the financial asset is originated or acquired. However, those provisions are estimates and actual results may materially differ from those estimates. After collection efforts have been exhausted, trade receivables that are deemed uncollectible are removed from both accounts receivable and the allowance for credit losses.
Property and Equipment	Property and Equipment. Equipment, stated at cost, is depreciated using the straight-line method over the estimated useful life of the asset to an estimated salvage value. With respect to each class of asset, the estimated useful life is based upon a newly built asset being placed into service and represents the time period beyond which it is typically not justifiable for the Company to continue to operate the asset in the same or similar manner. From time to time, the Company may acquire older vessels that have already exceeded the Company’s useful life policy, in which case the Company depreciates such assets based on its best estimate of the asset’s remaining useful life, typically the period until the next survey or certification date. As of March 31, 2024 , the estimated useful life of the Company’s new offshore support vessels was 20 years. Equipment maintenance and repair costs and the costs of routine overhauls, drydockings and inspections performed on vessels and equipment are charged to operating expense as incurred. Expenditures that extend the useful life or improve the marketing and commercial characteristics of equipment as well as major renewals and improvements to other properties are capitalized. Certain interest costs incurred during the construction of equipment are capitalized as part of the assets’ carrying values and are amortized over such assets’ estimated useful lives. There was no capitalized interest recognized during the three months ended March 31, 2024 and 2023 .
Assets Held for Sale	Assets Held for Sale. As of March 31, 2024, one anchor handling towing supply vessel (“AHTS”) previously included in the Africa and Europe segment, with a carrying value of $ 0.5 million, was classified as assets held for sale as the Company expects to sell the vessel within one year.
Impairment of Long-Lived Assets and Impairment of 50% or Less Owned Companies	Impairment of Long-Lived Assets. The Company performs an impairment analysis of long-lived assets used in operations when indicators of impairment are present. These indicators may include a significant decrease in the market price of a long-lived asset or asset group, a significant adverse change in the extent or manner in which a long-lived asset or asset group is being used or in its physical condition, or a current period operating or cash flow loss combined with a history of operating or cash flow losses or a forecast that demonstrates continuing losses associated with the use of a long-lived asset or asset group. If the carrying values of the assets are not recoverable, as determined by their estimated future undiscounted cash flows, the estimated fair value of the assets or asset groups are compared to their current carrying values and impairment charges are recorded if the carrying value exceeds fair value. During the three months ended March 31, 2024 and 2023 , the Company did no t record impairment charges on any owned or leased-in vessels. Impairment charges are included in gains (losses) on asset dispositions and impairments in the accompanying consolidated statements of income (loss). Estimated fair values for the Company owned vessels were established by independent appraisers based on researched market information, replacement cost information and other data. For vessel classes and individual vessels with indicators of impairment as of March 31, 2024, the Company estimated that their future undiscounted cash flows exceeded their current carrying values. However, the Company’s estimates of future undiscounted cash flows are highly subjective as utilization and rates per day worked are uncertain, especially in light of the continued volatility in commodity prices as well as the timing and cost of reactivating cold-stacked vessels. If market conditions decline, changes in the Company’s expectations on future cash flows may result in recognizing additional impairment charges related to its long-lived assets in future periods. For any vessel or vessel class that has indicators of impairment and is deemed not recoverable through future operations, the Company determines the fair value of the vessel or vessel class. If the fair value determination is less than the carrying value of the vessel or vessel class, an impairment is recognized to reduce the carrying value to fair value. Fair value determination is primarily accomplished by obtaining independent valuations of vessel or vessel classes from qualified third-party appraisers. Impairment of 50% or Less Owned Companies. Investments in 50% or less owned companies are reviewed periodically to assess whether there is an other-than-temporary decline in the carrying value of the investment. In its evaluation, the Company considers, among other items, recent and expected financial performance and returns, impairments recorded by the investee and the capital structure of the investee. When the Company determines the estimated fair value of an investment is below carrying value and the decline is other-than-temporary, the investment is written down to its estimated fair value. Actual results may vary from the Company’s estimates due to the uncertainty regarding projected financial performance, the severity and expected duration of declines in value and the available liquidity in the capital markets to support the continuing operations of the investee, among other factors. Although the Company believes its assumptions and estimates are reasonable, the investee’s actual performance compared with the estimates could produce different results and lead to additional impairment charges in future periods. During the three months ended March 31, 2024 and 2023 , the Company did no t recognize any impairment charges related to its 50% or less owned companies.
Income Taxes	Income Taxes. During the three months ended March 31, 2024 , the Company’s effective income tax rate of 4.4 % was primarily due to foreign taxes paid that are not creditable against U.S. income taxes and foreign losses for which there is no benefit for U.S. income tax purposes.
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss). The components of accumulated other comprehensive income were as follows (in thousands): SEACOR Marine Holdings Inc. Foreign Derivative Total Other December 31, 2023 $ 7,577 $ — $ 7,577 Other comprehensive loss ( 71 ) — ( 71 ) Balance as of March 31, 2024 $ 7,506 $ — $ 7,506
Earnings (Loss) Per Share	Earnings ( Loss) Per Share. Basic earnings/loss per share of Common Stock of SEACOR Marine is computed based on the weighted average number of shares of Common Stock and warrants to purchase Common Stock at an exercise price of $ 0.01 per share (“Warrants”) issued and outstanding during the relevant periods. The Warrants are included in the basic earnings/loss per share of Common Stock because the shares issuable upon exercise of the Warrants are issuable for de minimis cash consideration and therefore not anti-dilutive. Diluted earnings/loss per share of Common Stock is computed based on the weighted average number of shares of Common Stock and Warrants issued and outstanding plus the effect of other potentially dilutive securities through the application of the treasury stock method and the if-converted method that assumes all shares of Common Stock have been issued and outstanding during the relevant periods pursuant to the conversion of the New Convertible Notes unless anti-dilutive. For the three months ended March 31, 2024 and 2023 , diluted loss per share of Common Stock excluded 2,978,724 shares of Common Stock issuable upon conversion of the New Convertible Notes as the effect of their inclusion in the computation would be anti-dilutive. In addition, for the three months ended March 31, 2024 and 2023 diluted loss per share of Common Stock excluded 1,378,797 and 1,672,932 shares of restricted stock, respectively, and 1,016,865 and 1,026,031 shares of Common Stock, respectively, issuable upon exercise of outstanding stock options, as the effect of their inclusion in the computation would be anti-dilutive.

Basis of Presentation and Acc_3

Basis of Presentation and Accounting Policies (Tables)	3 Months Ended
Basis of Presentation and Accounting Policies (Tables)	Mar. 31, 2024
Basis Of Presentation And Accounting Policies [Abstract]
Schedule of Deferred Revenues	Revenue that does not meet these criteria is deferred until the criteria is met and is considered a contract liability and is recognized as such. Contract liabilities, which are included in unearned revenue in the accompanying consolidated balance sheets, as of March 31, 2024 and December 31, 2023 were as follows (in thousands): 2024 2023 Balance at beginning of period $ 687 $ 2,333 Unearned revenues during the period 2,785 6,501 Revenues recognized during the period ( 1,415 ) ( 8,147 ) Balance at end of period $ 2,057 $ 687
Schedule of Accumulated Other Comprehensive Income (Loss)	The components of accumulated other comprehensive income were as follows (in thousands): SEACOR Marine Holdings Inc. Foreign Derivative Total Other December 31, 2023 $ 7,577 $ — $ 7,577 Other comprehensive loss ( 71 ) — ( 71 ) Balance as of March 31, 2024 $ 7,506 $ — $ 7,506

Investments, at Equity, and A_2

Investments, at Equity, and Advances to 50% or Less Owned Companies (Tables)	3 Months Ended
	Mar. 31, 2024
Schedule of Investments [Abstract]
Equity Method Investments	Investments, at equity, and advances to 50% or less owned companies as of March 31, 2024 and December 31, 2023 were as follows (in thousands): Ownership 2024 2023 Seabulk Angola 49.0 % $ 974 $ 1,668 SEACOR Marine Arabia 45.0 % 2,078 2,385 Other 20.0 % - 50.0 % 70 72 $ 3,122 $ 4,125

Long-term Debt (Tables)

Long-term Debt (Tables)	3 Months Ended
Long-term Debt (Tables)	Mar. 31, 2024
Debt Disclosure [Abstract]
Schedule of Long-term Debt Obligations	The Company’s long-term debt obligations as of March 31, 2024 and December 31, 2023 were as follows (in thousands): March 31, 2024 December 31, 2023 Guaranteed Notes $ 90,000 $ 90,000 New Convertible Notes 35,000 35,000 2023 SMFH Credit Facility 115,900 118,950 Sea-Cat Crewzer III Term Loan Facility 12,990 14,227 SEACOR Delta Shipyard Financing 66,424 68,647 SEACOR Alpine Credit Facility 25,180 26,200 Total principal due for long-term debt 345,494 353,024 Current portion due within one year ( 28,605 ) ( 28,365 ) Unamortized debt discount ( 30,959 ) ( 32,885 ) Deferred financing costs ( 3,941 ) ( 4,230 ) Long-term debt, less current portion $ 281,989 $ 287,544

Leases (Tables)

Leases (Tables)	3 Months Ended
Leases (Tables)	Mar. 31, 2024
Leases [Abstract]
Summary of Future Minimum Payments for Leases	As of March 31, 2024, future minimum payments for leases for the remainder of 2024 and the years ended December 31, noted below, were as follows (in thousands): Operating Leases Finance Leases Remainder of 2024 $ 1,332 $ 27 2025 746 6 2026 459 — 2027 400 — 2028 341 — Years subsequent to 2028 2,872 — 6,150 33 Interest component ( 1,475 ) — 4,675 33 Current portion of long-term lease liabilities 1,285 33 Long-term lease liabilities $ 3,390 $ —
Summary of Components of Leases Expense	For the three months ended March 31, 2024 and 2023 the components of lease expense were as follows (in thousands): Three Months Ended March 31, 2024 2023 Operating lease costs $ 394 $ 546 Finance lease costs: Amortization of finance lease assets (1) 10 160 Interest on finance lease liabilities (2) — 72 Short-term lease costs 87 174 $ 491 $ 952 (1) Included in amortization costs in the consolidated statements of income (loss) . (2) Included in interest expense in the consolidated statements of income (loss) .
Summary of Supplemental Cash Flow Information Related to Leases	For the three months ended March 31, 2024 supplemental cash flow information related to leases was as follows (in thousands): 2024 Operating cash outflows from operating leases $ 519 Financing cash outflows from finance leases 9 Right-of-use assets obtained for operating lease liabilities — Right-of-use assets obtained for finance lease liabilities —
Summary of Other Information Related to Leases	For the three months ended March 31, 2024 other information related to leases was as follows: 2024 Weighted average remaining lease term, in years - operating leases 10.6 Weighted average remaining lease term, in years - finance leases 0.9 Weighted average discount rate - operating leases 6.5 % Weighted average discount rate - finance leases 4.0 %

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
Income Taxes (Tables)	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation	The following table reconciles the difference between the statutory federal income tax rate for the Company and the effective income tax rate for the three months ended March 31, 2024: Statutory rate ( 21.0 )% Income (loss) of foreign subsidiaries not includable in U.S. return and foreign withholding tax 19.9 % 162(m) - Executive compensation 5.9 % Other ( 0.4 )% Effective income tax rate 4.4 %

Derivative Instruments and He_2

Derivative Instruments and Hedging Strategies (Tables)	3 Months Ended
Derivative Instruments and Hedging Strategies (Tables)	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Fair Value of Derivative Assets and Liabilities	The fair values of the Company’s derivative instruments were as follows (in thousands): March 31, 2024 December 31, 2023 Derivative Derivative Derivative Derivative Derivatives not designated as hedging instruments: Forward Exchange Contract $ — $ 99 $ 608 $ —
Schedule of Gains on Derivative Instruments not Designated as Hedging Instruments	The Company had no derivative instruments not designated as hedging instruments for the three months ended March 31, 2023 and recognized gains on derivative instruments not designated as hedging instruments for the three months ended March 31, 2024 as follows (in thousands): Three Months Ended March 31, 2024 2023 Forward currency exchange, option, and future contracts $ 543 $ —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
Fair Value Measurements (Tables)	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis	The Company’s financial assets and liabilities as of March 31, 2024 and December 31, 2023 that are measured at fair value on a recurring basis were as follows (in thousands): March 31, 2024 Level 1 Level 2 Level 3 LIABILITIES Derivative instruments $ — $ 99 $ — December 31, 2023 ASSETS Derivative instruments $ — $ 608 $ —
Schedule of Estimated Fair Values of Financial Assets and Liabilities	The estimated fair values of the Company’s other financial assets and liabilities as of March 31, 2024 and December 31, 2023 were as follows (in thousands): Estimated Fair Value March 31, 2024 Carrying Level 1 Level 2 Level 3 ASSETS Cash, cash equivalents and restricted cash $ 62,159 $ 62,159 $ — $ — LIABILITIES Long-term debt, including current portion 310,594 — 305,027 — December 31, 2023 ASSETS Cash, cash equivalents and restricted cash $ 84,131 $ 84,131 $ — $ — LIABILITIES Long-term debt, including current portion 315,909 — 307,653 —

Stock Based Compensation (Table

Stock Based Compensation (Tables)	3 Months Ended
Stock Based Compensation (Tables)	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Equity Incentive Plan Transactions	Transactions in connection with the Company’s Equity Incentive Plans during the three months ended March 31, 2024 were as follows: Restricted Stock Activity: Outstanding as of December 31, 2023 1,642,084 Granted 563,271 Vested (1) ( 826,618 ) Forfeited — Outstanding as of March 31, 2024 (2) 1,378,737 Stock Option Activity: Outstanding as of December 31, 2023 1,026,031 Granted — Exercised ( 9,166 ) Forfeited — Outstanding as of March 31, 2024 1,016,865 (1) Includes 157,455 vested grants of performance-based stock. (2) Includes 184,930 grants of performance-based stock that satisfied the performance obligation and are therefore likely to vest and excludes 357,520 grants of performance-based stock units that are not considered outstanding until such time that they become probable to vest.

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
Segment Information (Tables)	Mar. 31, 2024
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following tables summarize the operating results, capital expenditures and assets of the Company’s reportable segments for the periods indicated (in thousands): United Africa Middle Latin Total For the Three Months Ended March 31, 2024 Operating Revenues: Time charter $ 6,957 $ 20,555 $ 16,477 $ 15,274 $ 59,263 Bareboat charter — — — 364 364 Other marine services 1,026 169 350 1,598 3,143 7,983 20,724 16,827 17,236 62,770 Direct Costs and Expenses: Operating: Personnel 5,781 5,181 5,963 4,745 21,670 Repairs and maintenance 1,404 3,209 2,712 2,438 9,763 Drydocking 1,968 2,032 1,483 1,223 6,706 Insurance and loss reserves 396 334 618 390 1,738 Fuel, lubes and supplies 667 1,287 1,198 1,371 4,523 Other ( 171 ) 2,199 1,000 671 3,699 10,045 14,242 12,974 10,838 48,099 Direct Vessel (Loss) Profit $ ( 2,062 ) $ 6,482 $ 3,853 $ 6,398 14,671 Other Costs and Expenses: Lease expense $ 138 $ 178 $ 85 $ 80 481 Administrative and general 11,917 Depreciation and amortization 2,750 3,915 3,496 2,721 12,882 25,280 Losses on asset dispositions and impairments, net ( 1 ) Operating loss $ ( 10,610 ) As of March 31, 2024 Property and Equipment: Historical Cost $ 163,373 $ 292,292 $ 267,401 $ 196,073 $ 919,139 Accumulated Depreciation ( 85,334 ) ( 100,578 ) ( 98,203 ) ( 52,886 ) ( 337,001 ) $ 78,039 $ 191,714 $ 169,198 $ 143,187 $ 582,138 Total Assets (1) $ 107,976 $ 223,985 $ 193,756 $ 161,590 $ 687,307 (1) Total Assets by region does not include corporate assets of $ 57.5 million as of March 31, 2024 . United Africa Middle Latin Total For the Three Months Ended March 31, 2023 Operating Revenues: Time charter $ 6,564 $ 18,996 $ 16,028 $ 13,827 $ 55,415 Bareboat charter — — — 360 360 Other 3,850 225 27 1,332 5,434 10,414 19,221 16,055 15,519 61,209 Direct Costs and Expenses: Operating: Personnel 6,535 4,505 4,841 3,922 19,803 Repairs and maintenance 1,194 2,553 677 1,587 6,011 Drydocking 43 1,184 ( 1,095 ) ( 119 ) 13 Insurance and loss reserves 1,041 318 1,185 245 2,789 Fuel, lubes and supplies 783 2,215 1,142 679 4,819 Other 231 2,749 1,496 598 5,074 9,827 13,524 8,246 6,912 38,509 Direct Vessel Profit $ 587 $ 5,697 $ 7,809 $ 8,607 22,700 Other Costs and Expenses: Lease expense $ 136 $ 429 $ 76 $ 79 720 Administrative and general 11,632 Depreciation and amortization 3,535 3,925 3,688 2,614 13,762 26,114 Gains on asset dispositions and impairments, net 3,599 Operating income $ 185 As of March 31, 2023 Property and Equipment: Historical Cost $ 208,241 $ 287,168 $ 286,795 $ 187,124 $ 969,328 Accumulated Depreciation ( 99,165 ) ( 96,086 ) ( 93,132 ) ( 35,814 ) ( 324,197 ) $ 109,076 $ 191,082 $ 193,663 $ 151,310 $ 645,131 Total Assets (1) $ 146,209 $ 216,899 $ 213,461 $ 172,575 $ 749,144 (1) Total Assets by region does not include corporate assets of $ 54.4 million as of March 31, 2023 .

Basis of Presentation and Acc_4

Basis of Presentation and Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Basis Of Presentation And Accounting Policies [Line Items]
Unearned revenue	$ 2,057,000		$ 687,000	$ 2,333,000
Estimated useful life (Year)	20 years
Capitalized interest costs, including allowance for funds used during construction, total	$ 0	$ 0
Assets held for sale	$ 500,000		500,000
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]	Gains (losses) on asset dispositions and impairments, net	Gains (losses) on asset dispositions and impairments, net
Impairment of long-lived assets owned or leased in vessels	$ 0	$ 0
Equity method investment, other than temporary impairment	$ 0	$ 0
Effective income tax rate reconciliation, percent, total	4.40%
Class of warrant or right, exercise price of warrants or rights	$ 0.01
Africa and Europe, Continuing Operations
Basis Of Presentation And Accounting Policies [Line Items]
Assets held for sale	$ 500,000
Convertible Debt Securities
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of loss per share, amount	2,978,724	2,978,724
Restricted Stock
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of loss per share, amount	1,378,797	1,672,932
Employee Stock Option
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of loss per share, amount	1,016,865	1,026,031
Anchor Handling Towing Supply Vessel
Basis Of Presentation And Accounting Policies [Line Items]
Impairment of long-lived assets owned or leased in vessels			$ 700,000
Equity Investments in 50% or Less Owned Companies \| Minimum
Basis Of Presentation And Accounting Policies [Line Items]
Equity method investment, ownership percentage	20%
Equity Investments in 50% or Less Owned Companies \| Maximum
Basis Of Presentation And Accounting Policies [Line Items]
Equity method investment, ownership percentage	50%	50%
Equity Investments in 50% or Less Owned Companies \| SEACOR Marine Foreign Holdings \| Minimum
Basis Of Presentation And Accounting Policies [Line Items]
Equity method investment, ownership percentage	50%

Basis of Presentation and Acc_5

Basis of Presentation and Accounting Policies - Schedule of Deferred Revenues (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Basis Of Presentation And Accounting Policies [Abstract]
Balance at beginning of period	$ 687	$ 2,333
Unearned revenues during the period	2,785	6,501
Revenues recognized during the period	(1,415)	(8,147)
Balance at end of period	$ 2,057	$ 687

Basis of Presentation and Acc_6

Basis of Presentation and Accounting Policies - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 374,224	$ 379,146
Other comprehensive loss	(71)	516
Balance	348,866	369,040
Accumulated Foreign Currency Adjustment Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	7,577
Other comprehensive loss	(71)
Balance	7,506
Derivative Gains (Losses) on Cash Flow Hedges, net Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	0
Other comprehensive loss	0
Balance	0
AOCI Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	7,577	6,847
Other comprehensive loss	(71)
Balance	$ 7,506	$ 7,363

Equipment Acquisitions and Di_2

Equipment Acquisitions and Dispositions - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) Vessel Equipment	Mar. 31, 2023 USD ($) Liftboat
Property Plant And Equipment [Line Items]
Number of equipment deliveries \| Equipment	0
Proceeds from disposition of property and equipment	$ 0	$ 7,611
Platform Supply Vessels
Property Plant And Equipment [Line Items]
Payments to acquire property, plant, and equipment, including fair value hedges	$ 3,400
Vessel
Property Plant And Equipment [Line Items]
Number of equipment sold \| Vessel	0
Liftboat
Property Plant And Equipment [Line Items]
Number of equipment sold, classified as held for sale \| Liftboat		3
Platform Supply Vessels And Fast Support Vessels
Property Plant And Equipment [Line Items]
Proceeds from disposition of property and equipment		$ 7,600
Gain (loss) on disposition of property, plant and equipment		$ 2,600

Investments, at Equity, and A_3

Investments, at Equity, and Advances to 50% or Less Owned Companies - Schedule of Equity Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Schedule Of Investments [Line Items]
Investments at equity	$ 3,122	$ 4,125	$ 3,600
Seabulk Angola
Schedule Of Investments [Line Items]
Ownership percentage	49%
Investments at equity	$ 974	1,668
SEACOR Marine Arabia
Schedule Of Investments [Line Items]
Ownership percentage	45%
Investments at equity	$ 2,078	2,385
Other Offshore Marine Services Joint Ventures
Schedule Of Investments [Line Items]
Investments at equity	$ 70	$ 72
Other Offshore Marine Services Joint Ventures \| Minimum
Schedule Of Investments [Line Items]
Ownership percentage	20%
Other Offshore Marine Services Joint Ventures \| Maximum
Schedule Of Investments [Line Items]
Ownership percentage	50%		50%

Long Term Debt - Schedule of Lo

Long Term Debt - Schedule of Long-term Debt Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 345,494	$ 353,024
Current portion due within one year	(28,605)	(28,365)
Unamortized debt discount	(30,959)	(32,885)
Deferred financing costs	(3,941)	(4,230)
Long-term debt, less current portion	281,989	287,544
Guaranteed Notes
Debt Instrument [Line Items]
Long-term Debt, Gross	90,000	90,000
New Convertible Notes
Debt Instrument [Line Items]
Long-term Debt, Gross	35,000	35,000
2023 SMFH Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	115,900	118,950
Sea-Cat Crewzer III Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	12,990	14,227
SEACOR Delta Shipyard Financing
Debt Instrument [Line Items]
Long-term Debt, Gross	66,424	68,647
SEACOR Alpine Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 25,180	$ 26,200

Long Term Debt - Additional Inf

Long Term Debt - Additional Information (Details) $ in Millions	Mar. 31, 2024 USD ($)
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 0.4

Leases - Additional Information

Leases - Additional Information (Details)	3 Months Ended
Leases - Additional Information (Details)	Mar. 31, 2024 Vessel
Anchor Handling Towing Supply
Lessee Lease Description [Line Items]
Number of operating leases on equipment	1
Vessel
Lessee Lease Description [Line Items]
Operating and finance lease, lease terms (in duration)	6 months
Other Equipment \| Minimum
Lessee Lease Description [Line Items]
Operating lease, lease terms (in duration)	11 months
Other Equipment \| Maximum
Lessee Lease Description [Line Items]
Operating lease, lease terms (in duration)	273 months

Leases - Summary of Future Mini

Leases - Summary of Future Minimum Payments For Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Operating Leases
Remainder of 2024	$ 1,332
2025	746
2026	459
2027	400
2028	341
Years subsequent to 2028	2,872
Operating lease payments due	6,150
Interest component	(1,475)
Total operating leases	4,675
Current portion of operating lease liabilities	1,285	$ 1,591
Long-term operating lease liabilities	3,390	3,529
Finance Leases
Remainder of 2024	27
2025	6
2026	0
2027	0
2028	0
Years subsequent to 2028	0
Total finance leases	33
Interest component	0
Finance Leases	33
Current portion of finance lease liabilities	33	35
Long-term finance lease liabilities	$ 0	$ 6

Leases - Summary of Components

Leases - Summary of Components of Leases Expense (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Leases [Abstract]
Operating lease costs		$ 394	$ 546
Finance lease costs:
Amortization of finance lease assets	[1]	10	160
Interest on lease liabilities	[2]	0	72
Short-term lease costs		87	174
Total lease expense		$ 491	$ 952

[1] Included in amortization costs in the consolidated statements of income (loss) Included in interest expense in the consolidated statements of income (loss)

Leases - Summary of Supplementa

Leases - Summary of Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Leases [Abstract]
Operating cash outflows from operating leases	$ 519
Financing cash outflows from finance leases	9	$ 114
Right-of-use assets obtained for operating lease liabilities	0
Right-of-use assets obtained for finance lease liabilities	$ 0

Leases - Summary of Other Infor

Leases - Summary of Other Information Related to Leases (Details)	Mar. 31, 2024
Leases [Abstract]
Weighted average remaining lease term, in years - operating leases	10 years 7 months 6 days
Weighted average remaining lease term, in years - finance leases	10 months 24 days
Weighted average discount rate - operating leases	6.50%
Weighted average discount rate - finance leases	4%

Income Taxes - Schedule of Effe

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)	3 Months Ended
	Mar. 31, 2024
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory rate	(21.00%)
Income (loss) of foreign subsidiaries not includable in U.S. return and foreign withholding tax	19.90%
162(m) - Executive compensation	5.90%
Other	(0.40%)
Effective income tax rate	4.40%

Derivative Instruments and He_3

Derivative Instruments and Hedging Strategies - Schedule of Fair Value of Derivative Assets and Liabilities (Details) - Not Designated as Hedging Instrument - Forward Exchange Contract - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Derivative Asset	$ 0	$ 608
Derivative Liability	$ 99	$ 0

Derivative Instruments and He_4

Derivative Instruments and Hedging Strategies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative [Line Items]
Derivative gains (loss) on cash flow hedges	$ 0	$ 14
Cash Flow Hedging
Derivative [Line Items]
Derivative gains (loss) on cash flow hedges		$ (200)
Fair Value Hedging \| Derivative Liabilities
Derivative [Line Items]
Recognized gain (loss) on hedged item in fair value hedge	$ (500)

Derivative Instruments and He_5

Derivative Instruments and Hedging Strategies - Schedule of Gains (Losses) on Derivative Instruments not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Forward Currency Exchange, Option, and Future Contracts
Derivative [Line Items]
Gains on derivative instruments	$ 543	$ 0

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Inputs, Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Asset		$ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Receivables Net Current
Derivative Liability	$ 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Derivative Liability, Current
Fair Value, Inputs, Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Asset		$ 608
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Receivables Net Current
Derivative Liability	$ 99
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Derivative Liability, Current
Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Asset		$ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Receivables Net Current
Derivative Liability	$ 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Derivative Liability, Current

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Estimated Fair Values of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Reported Value Measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	$ 62,159	$ 84,131
Long-term debt, including current portion	310,594	315,909
Estimate of Fair Value Measurement \| Fair Value, Inputs, Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	62,159	84,131
Long-term debt, including current portion	0	0
Estimate of Fair Value Measurement \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	0	0
Long-term debt, including current portion	305,027	307,653
Estimate of Fair Value Measurement \| Fair Value, Inputs, Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	0	0
Long-term debt, including current portion	$ 0	$ 0

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impairment charges	$ 0
Impairment of long-lived assets owned or leased in vessels	$ 0	$ 0
Anchor Handling Towing Supply
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impairment of long-lived assets owned or leased in vessels			$ 700,000

Warrants - Additional Informati

Warrants - Additional Information (Details)	Mar. 31, 2024 $ / shares
Class of Warrant or Right [Line Items]
Class of warrant or right, exercise price of warrants or rights	$ 0.01

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) R$ in Thousands, £ in Millions, $ in Millions			3 Months Ended	12 Months Ended
	Nov. 23, 2023 USD ($)	Nov. 23, 2023 GBP (£)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 GBP (£)	Mar. 31, 2024 BRL (R$)
Commitments And Contingencies [Line Items]
Unrecorded unconditional purchase obligation, total			$ 12.5
Unrecorded unconditional purchase obligation payable during 2024			7.3
Unrecorded unconditional purchase obligation payable during 2025			5.2
Unrecorded unconditional purchase obligation due within four years			$ 9.2
Deficiency Notice
Commitments And Contingencies [Line Items]
Cost allocation percentage			70%
Deficiency Notice \| Seabulk Overseas
Commitments And Contingencies [Line Items]
Cost allocation percentage			30%
Minimum \| Deficiency Notice
Commitments And Contingencies [Line Items]
Potential range of levies			$ 4.8			R$ 23900
Maximum \| Deficiency Notice
Commitments And Contingencies [Line Items]
Potential range of levies			$ 2.6			R$ 12870
FSV Offshore Support Vessels
Commitments And Contingencies [Line Items]
Unrecorded unconditional purchase obligation, maximum quantity			1			1
Hybrid Battery Power Systems
Commitments And Contingencies [Line Items]
Unrecorded unconditional purchase obligation, total			$ 10.5
MNRPF
Commitments And Contingencies [Line Items]
Defined contribution plan, tri annual valuation	$ 1.5	£ 1.2
Defined contribution plan, payroll related operating expenses				$ 1.5	£ 1.2

Stock Based Compensation - Sche

Stock Based Compensation - Schedule of Equity Incentive Plan Transactions (Details)	3 Months Ended
	Mar. 31, 2024 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding as of the beginning of year (in shares)	1,642,084
Outstanding as of the beginning of year (in shares)	1,026,031
Granted (in shares)	0
Exercised (in shares)	(9,166)
Outstanding as of the end of year (in shares)	1,016,865
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in shares)	563,271
Vested (in shares)	(826,618)	[1]
Forfeited (in shares)	0
Outstanding as of the end of year (in shares)	1,378,737	[2]
Forfeited (in shares)	0

[1] Includes 157,455 vested grants of performance-based stock. Includes 184,930 grants of performance-based stock that satisfied the performance obligation and are therefore likely to vest and excludes 357,520 grants of performance-based stock units that are not considered outstanding until such time that they become probable to vest.

Stock Based Compensation - Sc_2

Stock Based Compensation - Schedule of Equity Incentive Plan Transactions (Details) (Parenthetical) - shares	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding		1,642,084
Performance Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares vested	157,455
Number of shares likely to vest	184,930
Number of shares outstanding	357,520

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Treasury stock, value acquired cost method	$ 3,081	$ 2,266
Lapsing of Restrictions on Share Awards
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Treasury stock, shares acquired	251,333
Treasury stock, value acquired cost method	$ 3,100
Lapsing of Restrictions on Performance-based Share Awards
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Treasury stock, shares acquired	61,305
Treasury stock, value acquired cost method	$ 800

Segment Information - Schedule

Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024		Mar. 31, 2023		Dec. 31, 2023
Segment Reporting Information [Line Items]
Operating Revenues	$ 62,770		$ 61,209
Direct Costs and Expenses	48,099		38,509
Direct Vessel (Loss) Profit	14,671		22,700
Lease expense	481		720
Administrative and general	11,917		11,632
Depreciation and amortization	12,882		13,762
Other Costs and Expenses	25,280		26,114
Gains (losses) on asset dispositions and impairments, net	(1)		3,599
Operating (Loss) Income	(10,610)		185
Historical cost	919,139		969,328		$ 918,823
Accumulated depreciation	(337,001)		(324,197)		(324,141)
Property and equipment	582,138		645,131		$ 594,682
Total Assets	687,307	[1]	749,144	[2]
Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	59,263		55,415
Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	364		360
Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	3,143		5,434
Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	21,670		19,803
Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	9,763		6,011
Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	6,706		13
Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,738		2,789
Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	4,523		4,819
Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	3,699		5,074
UNITED STATES
Segment Reporting Information [Line Items]
Operating Revenues	7,983		10,414
Direct Costs and Expenses	10,045		9,827
Direct Vessel (Loss) Profit	(2,062)		587
Lease expense	138		136
Depreciation and amortization	2,750		3,535
Historical cost	163,373		208,241
Accumulated depreciation	(85,334)		(99,165)
Property and equipment	78,039		109,076
Total Assets	107,976	[1]	146,209	[2]
UNITED STATES \| Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	6,957		6,564
UNITED STATES \| Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	0		0
UNITED STATES \| Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	1,026		3,850
UNITED STATES \| Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	5,781		6,535
UNITED STATES \| Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,404		1,194
UNITED STATES \| Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,968		43
UNITED STATES \| Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	396		1,041
UNITED STATES \| Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	667		783
UNITED STATES \| Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	(171)		231
Africa and Europe
Segment Reporting Information [Line Items]
Operating Revenues	20,724		19,221
Direct Costs and Expenses	14,242		13,524
Direct Vessel (Loss) Profit	6,482		5,697
Lease expense	178		429
Depreciation and amortization	3,915		3,925
Historical cost	292,292		287,168
Accumulated depreciation	(100,578)		(96,086)
Property and equipment	191,714		191,082
Total Assets	223,985	[1]	216,899	[2]
Africa and Europe \| Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	20,555		18,996
Africa and Europe \| Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	0		0
Africa and Europe \| Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	169		225
Africa and Europe \| Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	5,181		4,505
Africa and Europe \| Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	3,209		2,553
Africa and Europe \| Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	2,032		1,184
Africa and Europe \| Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	334		318
Africa and Europe \| Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,287		2,215
Africa and Europe \| Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	2,199		2,749
Middle East and Asia
Segment Reporting Information [Line Items]
Operating Revenues	16,827		16,055
Direct Costs and Expenses	12,974		8,246
Direct Vessel (Loss) Profit	3,853		7,809
Lease expense	85		76
Depreciation and amortization	3,496		3,688
Historical cost	267,401		286,795
Accumulated depreciation	(98,203)		(93,132)
Property and equipment	169,198		193,663
Total Assets	193,756	[1]	213,461	[2]
Middle East and Asia \| Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	16,477		16,028
Middle East and Asia \| Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	0		0
Middle East and Asia \| Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	350		27
Middle East and Asia \| Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	5,963		4,841
Middle East and Asia \| Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	2,712		677
Middle East and Asia \| Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,483		(1,095)
Middle East and Asia \| Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	618		1,185
Middle East and Asia \| Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,198		1,142
Middle East and Asia \| Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,000		1,496
Latin America
Segment Reporting Information [Line Items]
Operating Revenues	17,236		15,519
Direct Costs and Expenses	10,838		6,912
Direct Vessel (Loss) Profit	6,398		8,607
Lease expense	80		79
Depreciation and amortization	2,721		2,614
Historical cost	196,073		187,124
Accumulated depreciation	(52,886)		(35,814)
Property and equipment	143,187		151,310
Total Assets	161,590	[1]	172,575	[2]
Latin America \| Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	15,274		13,827
Latin America \| Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	364		360
Latin America \| Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	1,598		1,332
Latin America \| Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	4,745		3,922
Latin America \| Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	2,438		1,587
Latin America \| Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,223		(119)
Latin America \| Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	390		245
Latin America \| Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,371		679
Latin America \| Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	$ 671		$ 598

[1] Total Assets by region does not include corporate assets of $ 57.5 million as of March 31, 2024 . Total Assets by region does not include corporate assets of $ 54.4 million as of March 31, 2023 .

Segment Information - Schedul_2

Segment Information - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Segment Reporting Information [Line Items]
Assets, Total	$ 744,846	$ 780,336
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Assets, Total	$ 57,500		$ 54,400

Segment Information - Additiona

Segment Information - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Segment Information [Line Items]
Equity method investments	$ 3,122	$ 3,600	$ 4,125
Equity in (losses) earnings of 50% or less owned companies	$ (1,100)	$ 536
Equity Investments in 50% or Less Owned Companies \| Maximum
Segment Information [Line Items]
Equity method investment, ownership percentage	50%	50%
Other Offshore Marine Services Joint Ventures
Segment Information [Line Items]
Equity method investments	$ 70		$ 72
Other Offshore Marine Services Joint Ventures \| Maximum
Segment Information [Line Items]
Equity method investment, ownership percentage	50%	50%