Heidrick & Struggles International (HSII) 10-Q6 May 242024 Q1 Quarterly reportFinancial data

Company Profile

Cover

Cover - shares	3 Months Ended
Cover - shares	Mar. 31, 2024	May 03, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	0-25837
Entity Registrant Name	HEIDRICK & STRUGGLES INTERNATIONAL, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-2681268
Entity Address, Address Line One	233 South Wacker Drive
Entity Address, Address Line Two	Suite 4900
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60606-6303
City Area Code	(312)
Local Phone Number	496-1200
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	HSII
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		20,248,494
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001066605
Current Fiscal Year End Date	--12-31

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 252,831	$ 412,618
Marketable securities	0	65,538
Accounts receivable, net of allowances of $7,517 and $6,954, respectively	172,953	133,128
Prepaid expenses	31,426	23,597
Other current assets	48,865	47,923
Income taxes recoverable	5,957	10,410
Total current assets	512,032	693,214
Non-current assets
Property and equipment, net	40,452	35,752
Operating lease right-of-use assets	85,053	86,063
Assets designated for retirement and pension plans	10,854	11,105
Investments	54,835	47,287
Other non-current assets	16,680	17,071
Goodwill	200,089	202,252
Other intangible assets, net	18,305	20,842
Deferred income taxes	27,170	28,005
Total non-current assets	453,438	448,377
Total assets	965,470	1,141,591
Current liabilities
Accounts payable	19,776	20,837
Accrued salaries and benefits	133,735	322,744
Deferred revenue	47,377	45,732
Operating lease liabilities	20,351	21,498
Other current liabilities	24,449	21,823
Income taxes payable	6,190	6,057
Total current liabilities	251,878	438,691
Non-current liabilities
Accrued salaries and benefits	50,263	52,108
Retirement and pension plans	69,572	62,100
Operating lease liabilities	78,050	78,204
Other non-current liabilities	41,152	41,808
Deferred income taxes	5,770	6,402
Total non-current liabilities	244,807	240,622
Total liabilities	496,685	679,313
Commitments and contingencies (Note 18)
Stockholders’ equity
Preferred stock, $0.01 par value, 10,000,000 shares authorized, no shares issued at March 31, 2024 and December 31, 2023	0	0
Common stock, $0.01 par value, 100,000,000 shares authorized, 20,253,574 and 20,127,872 shares issued, 20,248,494 and 20,122,792 shares outstanding at March 31, 2024 and December 31, 2023, respectively	202	201
Treasury stock at cost, 5,080 shares at March 31, 2024 and December 31, 2023	(110)	(110)
Additional paid in capital	251,769	251,988
Retained earnings	220,886	210,070
Accumulated other comprehensive income (loss)	(3,962)	129
Total stockholders’ equity	468,785	462,278
Total liabilities and stockholders’ equity	$ 965,470	$ 1,141,591
Treasury stock (in shares)	5,080	5,080

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Accounts receivable, allowance for credit loss, current	$ 7,517	$ 6,954
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	10,000,000	10,000,000
Preferred stock, issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	100,000,000	100,000,000
Common stock, issued (in shares)	20,253,574	20,127,872
Common stock, outstanding (in shares)	20,248,494	20,122,792
Treasury stock (in shares)	5,080	5,080

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue
Revenue before reimbursements (net revenue)	$ 265,197	$ 239,317
Reimbursements	3,901	2,802
Total revenue	269,098	242,119
Operating expenses
Salaries and benefits	174,413	158,859
General and administrative expenses	41,363	34,327
Cost of services	27,432	22,832
Research and development	5,715	5,528
Reimbursed expenses	3,901	2,802
Total operating expenses	252,824	224,348
Operating income	16,274	17,771
Non-operating income
Interest, net	4,086	3,249
Other, net	2,571	1,809
Net non-operating income	6,657	5,058
Income before income taxes	22,931	22,829
Provision for income taxes	8,899	7,243
Net income	14,032	15,586
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment	(4,058)	402
Net unrealized gain (loss) on available-for-sale investments	(33)	41
Other comprehensive income (loss), net of tax	(4,091)	443
Comprehensive income	$ 9,941	$ 16,029
Weighted-average common shares outstanding
Basic (in shares)	20,144	19,904
Diluted (in shares)	21,040	20,569
Earnings per common share
Basic (in dollars per share)	$ 0.70	$ 0.78
Diluted (in dollars per share)	0.67	0.76
Cash dividends paid per share (in dollars per share)	$ 0.15	$ 0.15

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2022		19,866,000
Beginning balance at Dec. 31, 2022	$ 410,646	$ 199	$ (191)	$ 246,630	$ 168,197	$ (4,189)
Treasury stock, beginning balance (in shares) at Dec. 31, 2022			5,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	15,586				15,586
Other comprehensive income (loss), net of tax	443					443
Common and treasury stock transactions:
Stock-based compensation	1,853			1,853
Vesting of equity awards, net of tax withholding (in shares)		172,000
Vesting of equity awards, net of tax withholding	(4,141)	$ 1		(4,142)
Clawback of equity awards (in shares)			5,000
Clawback of equity awards	(163)		$ (163)
Cash dividends declared ($0.15 per share)	(3,006)				(3,006)
Dividend equivalents on restricted stock units	(106)				(106)
Ending balance (in shares) at Mar. 31, 2023		20,038,000
Ending balance at Mar. 31, 2023	$ 421,112	$ 200	$ (354)	244,341	180,671	(3,746)
Treasury stock, ending balance (in shares) at Mar. 31, 2023			10,000
Beginning balance (in shares) at Dec. 31, 2023	20,122,792	20,127,000
Beginning balance at Dec. 31, 2023	$ 462,278	$ 201	$ (110)	251,988	210,070	129
Treasury stock, beginning balance (in shares) at Dec. 31, 2023	5,080		5,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 14,032				14,032
Other comprehensive income (loss), net of tax	(4,091)					(4,091)
Common and treasury stock transactions:
Stock-based compensation	2,644			2,644
Vesting of equity awards, net of tax withholding (in shares)		127,000
Vesting of equity awards, net of tax withholding	(2,862)	$ 1		(2,863)
Cash dividends declared ($0.15 per share)	(3,018)				(3,018)
Dividend equivalents on restricted stock units	$ (198)				(198)
Ending balance (in shares) at Mar. 31, 2024	20,248,494	20,254,000
Ending balance at Mar. 31, 2024	$ 468,785	$ 202	$ (110)	$ 251,769	$ 220,886	$ (3,962)
Treasury stock, ending balance (in shares) at Mar. 31, 2024	5,080		5,000

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.15	$ 0.15
Clawback of equity awards		$ (163)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows - operating activities
Net income	$ 14,032	$ 15,586
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	4,790	3,873
Deferred income taxes	(87)	6,669
Stock-based compensation expense	2,644	1,853
Accretion expense related to earnout payments	466	191
Gain on marketable securities	(539)	(1,645)
Loss on disposal of property and equipment	14	130
Changes in assets and liabilities:
Accounts receivable	(41,125)	(24,332)
Accounts payable	(2,069)	(1,137)
Accrued expenses	(182,590)	(325,975)
Deferred revenue	1,951	147
Income taxes recoverable and payable, net	4,723	(3,083)
Retirement and pension plan assets and liabilities	5,453	6,070
Prepaid expenses	(7,991)	(7,135)
Other assets and liabilities, net	(3,096)	(8,243)
Net cash used in operating activities	(203,424)	(337,031)
Cash flows - investing activities
Acquisition of businesses, net of cash acquired	0	(29,907)
Capital expenditures	(6,173)	(3,808)
Purchases of marketable securities and investments	(5,400)	(6,172)
Proceeds from sales of marketable securities and investments	66,285	267,965
Net cash provided by investing activities	54,712	228,078
Cash flows - financing activities
Cash dividends paid	(3,216)	(3,112)
Payment of employee tax withholdings on equity transactions	(2,862)	(4,141)
Acquisition earnout payments	0	(35,946)
Net cash used in financing activities	(6,078)	(43,199)
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash	(4,997)	1,396
Net decrease in cash, cash equivalents and restricted cash	(159,787)	(150,756)
Cash, cash equivalents and restricted cash at beginning of period	412,618	355,489
Cash, cash equivalents and restricted cash at end of period	$ 252,831	$ 204,733

Basis of Presentation of Interi

Basis of Presentation of Interim Financial Information	3 Months Ended
Basis of Presentation of Interim Financial Information	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation of Interim Financial Information	Basis of Presentation of Interim Financial Information The accompanying unaudited Condensed Consolidated Financial Statements of Heidrick & Struggles International, Inc. and subsidiaries (the "Company") have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission ("SEC"). The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses. Significant items subject to estimates and assumptions include revenue recognition, income taxes, interim effective tax rate and the assessment of goodwill, other intangible assets and long-lived assets for impairment. Estimates are subject to a degree of uncertainty and actual results could differ from these estimates. In the opinion of management, all adjustments necessary to fairly present the financial position of the Company at March 31, 2024 and December 31, 2023, the results of operations for the three months ended March 31, 2024 and 2023 and its cash flows for the three months ended March 31, 2024 and 2023 have been included and are of a normal, recurring nature except as otherwise disclosed. These financial statements and notes are to be read in conjunction with the Company’s Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023, as filed with the SEC on March 4, 2024.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2024
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies A complete listing of the Company’s significant accounting policies is discussed in Note 2, Summary of Significant Accounting Policies , in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. Revenue Recognition See Note 3 , Revenue. Cost of Services Cost of services consists of third-party contractor costs related to the delivery of various services in the Company's On-Demand Talent and Heidrick Consulting operating segments. Research and Development Research and development expense consists of payroll, employee benefits, stock-based compensation, other employee expenses and third-party professional fees associated with new product development. Marketable Securities The Company’s marketable securities consist of available-for-sale debt securities with original maturities exceeding three months. Restricted Cash The following table provides a reconciliation of the cash and cash equivalents between the Condensed Consolidated Balance Sheets and the Condensed Consolidated Statements of Cash Flows as of March 31, 2024, and 2023, and December 31, 2023, and 2022: March 31, December 31, 2024 2023 2023 2022 Cash and cash equivalents $ 252,831 $ 204,691 $ 412,618 $ 355,447 Restricted cash included within other non-current assets — 42 — 42 Total cash, cash equivalents and restricted cash $ 252,831 $ 204,733 $ 412,618 $ 355,489 Earnings per Common Share Basic earnings per common share are computed by dividing net income by weighted average common shares outstanding for the period. Diluted earnings per share reflect the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted. Common equivalent shares are excluded from the determination of diluted earnings per share in periods in which they have an anti-dilutive effect. The following table sets forth the computation of basic and diluted earnings per share: Three Months Ended 2024 2023 Net income $ 14,032 $ 15,586 Weighted average shares outstanding: Basic 20,144 19,904 Effect of dilutive securities: Restricted stock units 593 501 Performance stock units 303 164 Diluted 21,040 20,569 Basic earnings per share $ 0.70 $ 0.78 Diluted earnings per share $ 0.67 $ 0.76 Leases The Company determines if an arrangement is a lease at inception. Operating leases are included in Operating lease right-of-use assets , Current liabilities - Operating lease liabilities and Non-current liabilities - Operating lease liabilities in the Company's Condensed Consolidated Balance Sheets. The Company does not have any leases that meet the finance lease criteria. Right-of-use assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent the Company's obligation to make lease payments arising from the lease. Operating lease right-of-use assets and liabilities are recognized on the commencement date based on the present value of lease payments over the lease term. As most of the Company's leases do not provide an implicit rate, an incremental borrowing rate based on the information available at the commencement date is used in determining the present value of lease payments. The operating lease right-of-use asset also includes any lease payments made in advance and any accrued rent expense balances. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the option will be exercised. Lease expense for lease payments is recognized on a straight-line basis over the lease term. The Company has lease agreements with lease and non-lease components. For office leases, the Company accounts for the lease and non-lease components as a single lease component. For equipment leases, such as vehicles and office equipment, the Company accounts for the lease and non-lease components separately. Goodwill See Note 9 , Goodwill and Other Intangible Assets Recently Issued Financial Accounting Standards In December 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures." The standard is intended to expand the disclosure requirements for income taxes, specifically related to the rate reconciliation and income taxes paid. The guidance is effective for annual periods beginning after December 15, 2024, with early adoption permitted. The Company is currently evaluating the impact of this guidance on its financial statements. In November 2023, the FASB issued ASU No. 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” The standard is intended to improve reportable segment disclosure requirements for public business entities primarily through enhanced disclosures about significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit (referred to as the “significant expense principle”). This guidance is effective for annual periods beginning after December 15, 2023, and for interim periods beginning after December 15, 2024. The Company is currently evaluating the impact of this guidance on its financial statements. In March 2020, the Financial Accounting Standards Board issued Accounting Standards Update No. 2020-04, Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The guidance was intended to provide temporary optional expedients and exceptions to the guidance on contract modifications and hedge accounting to ease the financial reporting burdens related to the expected market transition from the London Interbank Offered Rate ("LIBOR") and other interbank offered rates to alternative reference rates. This guidance is effective March 12, 2020, and the Company may elect to apply the amendments prospectively through December 31, 2024. The new guidance is not expected to have a material effect on the Company's financial statements.

Revenue

Revenue	3 Months Ended
Revenue	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Executive Search Revenue is recognized as performance obligations are satisfied by transferring a good or service to a client. Generally, each executive search contract contains one performance obligation which is the process of identifying potentially qualified candidates for a specific client position. In most contracts, the transaction price includes both fixed and variable consideration. Fixed compensation is comprised of a retainer, equal to approximately one-third of the estimated first year compensation for the position to be filled, and indirect expenses, equal to a specified percentage of the retainer, as defined in the contract. The Company generally bills clients for the retainer and indirect expenses in one-third increments over a three-month period commencing in the month of a client’s acceptance of the contract. If actual compensation of a placed candidate exceeds the original compensation estimate, the Company is often authorized to bill the client for one-third of the excess compensation. The Company refers to this additional billing as uptick revenue. In most contracts, variable consideration is comprised of uptick revenue and direct expenses. The Company bills its clients for uptick revenue upon completion of the executive search, and direct expenses are billed as incurred. The Company estimates uptick revenue at contract inception, based on a portfolio approach, utilizing the expected value method based on a historical analysis of uptick revenue realized in the Company’s geographic regions and industry practices, and initially records a contract’s uptick revenue in an amount that is probable not to result in a significant reversal of cumulative revenue recognized when the actual amount of uptick revenue for the contract is known. Differences between the estimated and actual amounts of variable consideration are recorded when known. The Company does not estimate revenue for direct expenses as it is not materially different than recognizing revenue as direct expenses are incurred. Revenue from executive search engagement performance obligations is recognized over time as clients simultaneously receive and consume the benefits provided by the Company's performance. Revenue from executive search engagements is recognized over the expected average period of performance, in proportion to the estimated personnel time incurred to fulfill the obligations under the executive search contract. Revenue is generally recognized over a period of approximately six months. The Company's executive search contracts contain a replacement guarantee which provides for an additional search to be completed, free of charge except for expense reimbursements, should the candidate presented by the Company be hired by the client and subsequently terminated by the client for performance reasons within a specified period of time. The replacement guarantee is an assurance warranty, which is not a performance obligation under the terms of the executive search contract, as the Company does not provide any services under the terms of the guarantee that transfer benefits to the client in excess of assuring that the identified candidate complies with the agreed-upon specifications. The Company accounts for the replacement guarantee under the relevant warranty guidance in Accounting Standards Codification 460 - Guarantees. On-Demand Talent The Company enters into contracts with clients that outline the general terms and conditions of the assignment to provide on-demand consultants for various types of consulting projects, which consultants may be independent contractors or temporary employees. The consideration the Company expects to receive under each contract is dependent on the time-based fees specified in the contract. Revenue from on-demand engagement performance obligations is recognized over time as clients simultaneously receive and consume the benefits provided by the Company's performance. The Company has applied the practical expedient to recognize revenue for these services in the amount to which the Company has a right to invoice the client, as this amount corresponds directly with the value provided to the client for the performance completed to date. For transactions where a third-party contractor is involved in providing the services to the client, the Company reports the revenue and the related direct costs on a gross basis as it has determined that it is the principal in the transaction. The Company is primarily responsible for fulfilling the promise to provide consulting services to its clients and the Company has discretion in establishing the prices charged to clients for the consulting services and is able to contractually obligate the independent service provider to deliver services and deliverables that the Company has agreed to provide to its clients. Heidrick Consulting Revenue is recognized as performance obligations are satisfied by transferring a good or service to a client. Heidrick Consulting enters into contracts with clients that outline the general terms and conditions of the assignment to provide succession planning, executive assessment, top team and board effectiveness and culture shaping programs. The consideration the Company expects to receive under each contract is generally fixed. Most of the Company's consulting contracts contain one performance obligation, which is the overall process of providing the consulting service requested by the client. The majority of the Company's consulting revenue is recognized over time utilizing input methods. Revenue recognition over time for the majority of the Company's consulting engagements is measured by total cost or time incurred as a percentage of the total estimated cost or time on the consulting engagement. Contract Balances Contract assets and liabilities are reported in a net position on a contract-by-contract basis at the end of each reporting period. Contract assets and liabilities are classified as current due to the nature of the Company's contracts, which are completed within one year. Contract assets are included within Other current assets on the Condensed Consolidated Balance Sheets. Unbilled receivables: Unbilled receivables represents contract assets from revenue recognized over time in excess of the amount billed to the client and the amount billed to the client is solely dependent upon the passage of time. This amount includes revenue recognized in excess of billed Executive Search retainers, Heidrick Consulting fees, and On-Demand Talent fees. Contract assets: Contract assets represent revenue recognized over time in excess of the amount billed to the client, and the amount billed to the client is not solely subject to the passage of time. This amount primarily includes revenue recognized for upticks and contingent placement fees in executive search contracts. Deferred revenue: Contract liabilities consist of deferred revenue, which is equal to billings in excess of revenue recognized. The following table outlines the changes in the contract asset and liability balances from December 31, 2023, to March 31, 2024: March 31, December 31, Change Contract assets Unbilled receivables, net $ 17,335 $ 15,318 $ 2,017 Contract assets 16,540 16,774 (234) Total contract assets 33,875 32,092 1,783 Contract liabilities Deferred revenue $ 47,377 $ 45,732 $ 1,645 During the three months ended March 31, 2024, the Company recognized revenue of $31.2 million that was included in the contract liabilities balance at the beginning of the period. The amount of revenue recognized during the three months ended March 31, 2024, from performance obligations partially satisfied in previous periods as a result of changes in the estimates of variable consideration was $10.1 million. Each of the Company's contracts has an expected duration of one year or less.

Credit Losses

Credit Losses	3 Months Ended
Credit Losses	Mar. 31, 2024
Credit Loss [Abstract]
Credit Losses	Credit Losses The Company is exposed to credit losses primarily through the provision of its executive search, consulting, and on-demand talent services. The Company’s expected credit loss allowance methodology for accounts receivable is developed using historical collection experience, current and future economic and market conditions and a review of the current status of clients' trade accounts receivables. Due to the short-term nature of such receivables, the estimate of the amount of accounts receivable that may not be collected is primarily based on historical loss-rate experience. When required, the Company adjusts the loss-rate methodology to account for current conditions and reasonable and supportable expectations of future economic and market conditions. The Company generally assesses future economic conditions for a period of sixty to ninety days, which corresponds with the contractual life of its accounts receivables. Additionally, specific allowance amounts are established to record the appropriate provision for clients that have a higher probability of default. The Company’s monitoring activities include timely account reconciliation, dispute resolution, payment confirmation, consideration of clients' financial condition and macroeconomic conditions. Balances are written off when determined to be uncollectible. The activity in the allowance for credit losses on the Company's trade receivables is as follows: Balance at December 31, 2023 $ 6,954 Provision for credit losses 1,864 Write-offs (1,267) Foreign currency translation (34) Balance at March 31, 2024 $ 7,517 There were no investments with unrealized losses at March 31, 2024 and December 31, 2023.

Property and Equipment, net

Property and Equipment, net	3 Months Ended
Property and Equipment, net	Mar. 31, 2024
Property, Plant and Equipment [Abstract]
Property and Equipment, net	Property and Equipment, net The components of the Company’s property and equipment are as follows: March 31, December 31, Leasehold improvements $ 48,230 $ 45,050 Office furniture, fixtures and equipment 15,638 14,775 Computer equipment and software 41,140 38,798 Property and equipment, gross 105,008 98,623 Accumulated depreciation (64,556) (62,871) Property and equipment, net $ 40,452 $ 35,752 Depreciation expense for the three months ended March 31, 2024, and 2023, was $2.5 million and $2.0 million, respectively.

Leases

Leases	3 Months Ended
Leases	Mar. 31, 2024
Leases [Abstract]
Leases	Leases The Company's lease portfolio is comprised of operating leases for office space and equipment. The majority of the Company's leases include both lease and non-lease components, which the Company accounts for differently depending on the underlying class of asset. Certain of the Company's leases include one or more options to renew or terminate the lease at the Company's discretion. Generally, the renewal and termination options are not included in the right-of-use assets and lease liabilities as they are not reasonably certain of exercise. The Company regularly evaluates the renewal and termination options and, when they are reasonably certain of exercise, includes the renewal or termination option in the lease term. As most of the Company's leases do not provide an implicit interest rate, the Company utilizes an incremental borrowing rate based on the information available at the commencement date of the lease in determining the present value of lease payments. The Company has a centrally managed treasury function and, therefore, a portfolio approach is applied in determining the incremental borrowing rate. The incremental borrowing rate is the rate of interest that the Company would have to pay to borrow on a fully collateralized basis over a similar term in an amount equal to the total lease payments in a similar economic environment. As of March 31, 2024, office leases have remaining lease terms that range from less than one year to 11.6 years, some of which also include options to extend or terminate the lease. Most office leases contain both fixed and variable lease payments. Variable lease costs consist primarily of rent escalations based on an established index or rate and taxes, insurance, and common area or other maintenance costs, which are paid based on actual costs incurred by the lessor. The Company has elected to utilize the available practical expedient to not separate lease and non-lease components for office leases. As of March 31, 2024, equipment leases, which are comprised of vehicle and office equipment leases, have remaining terms that range from less than one year to 4.9 years, some of which also include options to extend or terminate the lease. The Company's equipment leases do not contain variable lease payments. The Company separates the lease and non-lease components for its equipment leases. Equipment leases do not comprise a significant portion of the Company's lease portfolio. Lease cost components included within Operating expenses - General and administrative expenses in the Condensed Consolidated Statements of Comprehensive Income were as follows: Three Months Ended 2024 2023 Operating lease cost $ 5,637 $ 4,525 Variable lease cost 2,455 $ 1,916 Total lease cost $ 8,092 $ 6,441 Supplemental cash flow information related to the Company's operating leases is as follows for the three months ended March 31: 2024 2023 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 5,539 $ 4,811 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 3,993 $ 2,570 The weighted average remaining lease term and weighted average discount rate for operating leases as of March 31, are as follows: 2024 2023 Weighted Average Remaining Lease Term Operating leases 7.3 years 6.3 years Weighted Average Discount Rate Operating leases 4.92 % 3.49 % The future maturities of the Company's operating lease liabilities as of March 31, 2024, for the years ended December 31 are as follows: Operating Lease Maturity 2024 $ 15,812 2025 16,952 2026 15,349 2027 15,082 2028 11,676 Thereafter 45,265 Total lease payments 120,136 Less: Interest 21,735 Present value of lease liabilities $ 98,401

Financial Instruments and Fair

Financial Instruments and Fair Value	3 Months Ended
Financial Instruments and Fair Value	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Financial Instruments and Fair Value	Financial Instruments and Fair Value Cash, Cash Equivalents and Marketable Securities The Company's investments in marketable debt securities, which consist of U.S. Treasury bills, are classified and accounted for as available-for-sale. The Company classifies its marketable debt securities as either short-term or long-term based on each instrument's underlying contractual maturity date. Unrealized gains and losses on marketable debt securities classified as available-for-sale are recognized in Accumulated other comprehensive income (loss) in the Condensed Consolidated Balance Sheets until realized. The Company's cash, cash equivalents, and marketable securities by significant investment category are as follows: Amortized Cost Unrealized Gains Fair Value Cash and Cash Equivalents Balance at March 31, 2024 Cash $ 168,635 Level 1 (1) : Money market funds 14,018 U.S. Treasury securities $ 70,169 $ 9 $ 70,178 70,178 Total Level 1 70,169 9 70,178 84,196 Total $ 70,169 $ 9 $ 70,178 $ 252,831 Amortized Cost Unrealized Gains Fair Value Cash and Cash Equivalents Marketable Securities Balance at December 31, 2023 Cash $ 221,980 $ — Level 1 (1) : Money market funds 13,906 — U.S. Treasury securities $ 242,228 $ 42 $ 242,270 176,732 65,538 Total Level 1 242,228 42 242,270 190,638 65,538 Total $ 242,228 $ 42 $ 242,270 $ 412,618 $ 65,538 (1) Level 1 – Quoted prices in active markets for identical assets and liabilities. Investments, Assets Designated for Retirement and Pension Plans and Associated Liabilities The Company has a U.S. non-qualified deferred compensation plan that consists primarily of U.S. marketable securities and mutual funds. The aggregate cost basis for these investments was $42.5 million and $37.2 million as of March 31, 2024, and December 31, 2023, respectively. The Company also maintains a pension plan for certain current and former employees in Germany. The pensions are individually fixed Euro amounts that vary depending on the function and the eligible years of service of the employee. The Company’s investment strategy is to support its pension obligations through reinsurance contracts. The BaFin—German Federal Financial Supervisory Authority—supervises the insurance companies and the reinsurance contracts. The BaFin requires each reinsurance contract to guarantee a fixed minimum return. The Company’s pension benefits are fully reinsured by group insurance contracts with ERGO Lebensversicherung AG, and the group insurance contracts are measured in accordance with BaFin guidelines (including mortality tables and discount rates) which are considered Level 2 inputs. The following tables provide a summary of the fair value measurements for each major category of investments, assets designated for retirement and pension plans and associated liabilities measured at fair value: Balance Sheet Classification Current Assets Non-Current Assets Current Liabilities Non-current Liabilities Fair Value Other Current Assets Assets Designated for Retirement and Pension Plans Investments Other Current Liabilities Retirement and Pension Plans Balance at March 31, 2024 Measured on a recurring basis: Level 1 (1) : U.S. non-qualified deferred compensation plan $ 54,835 $ — $ — $ 54,835 $ — $ — Level 2 (2) : Retirement and pension plan assets 12,114 1,260 10,854 — — — Pension benefit obligation (14,090) — — — (1,260) (12,830) Total Level 2 (1,976) 1,260 10,854 — (1,260) (12,830) Total $ 52,859 $ 1,260 $ 10,854 $ 54,835 $ (1,260) $ (12,830) Balance Sheet Classification Current Assets Non-Current Assets Current Liabilities Non-current Liabilities Fair Value Other Current Assets Assets Designated for Retirement and Pension Plans Investments Other Current Liabilities Retirement and Pension Plans Balance at December 31, 2023 Measured on a recurring basis: Level 1 (1) : U.S. non-qualified deferred compensation plan $ 47,287 $ — $ — $ 47,287 $ — $ — Level 2 (2) : Retirement and pension plan assets 12,394 1,289 11,105 — — — Pension benefit obligation (14,416) — — — (1,289) (13,127) Total Level 2 (2,022) 1,289 11,105 — (1,289) (13,127) Total $ 45,265 $ 1,289 $ 11,105 $ 47,287 $ (1,289) $ (13,127) (1) Level 1 – Quoted prices in active markets for identical assets and liabilities. (2) Level 2 – Quoted prices in active markets for similar assets and liabilities, or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. Contingent Consideration and Compensation The former owners of certain of the Company's acquired businesses are eligible to receive additional cash consideration based on the attainment of certain operating metrics in the periods subsequent to acquisition. Contingent consideration and compensation are valued using significant inputs that are not observable in the market, which are defined as Level 3 inputs pursuant to fair value measurement accounting. The Company determines the fair value of contingent consideration and compensation using a variation of the income approach, known as the real options method. The significant unobservable inputs utilized in the real options method include (1) revenue forecasts; (2) operating expense forecasts; (3) the discount rate; and (4) volatility. The following table provides a reconciliation of the beginning and ending balance of Level 3 liabilities for the three months ended March 31, 2024: Earnout Contingent Compensation Balance at December 31, 2023 $ (38,601) $ (18,878) Earnout accretion (466) — Compensation expense — (1,988) Payments — 4,821 Foreign currency translation 812 491 Balance at March 31, 2024 $ (38,255) $ (15,554) Earnout accruals of $38.3 million and $38.6 million were recorded within Non-current liabilities - Other non-current liabilities as of March 31, 2024, and December 31, 2023, respectively. Contingent compensation accruals of $4.1 million and $6.0 million are recorded within Current liabilities - Accrued salaries and benefits as of March 31, 2024, and December 31, 2023, respectively, and contingent compensation accruals of $11.4 million and $12.9 million are recorded within Non-current liabilities - Accrued salaries and benefits as of March 31, 2024, and December 31, 2023, respectively.

Acquisitions

Acquisitions	3 Months Ended
Acquisitions	Mar. 31, 2024
Business Combination and Asset Acquisition [Abstract]
Acquisitions	Acquisitions On February 1, 2023, the Company acquired Atreus Group GmbH ("Atreus"), a leading provider of executive interim management in Germany. The Company paid $33.4 million in the first quarter of 2023, with a subsequent purchase price adjustment payment of $12.1 million in the fourth quarter of 2023. The former owners of Atreus are eligible to receive additional cash consideration, which the Company estimated on the acquisition date to be between $30.0 million and $40.0 million, to be paid in 2026 based on the achievement of certain revenue and operating income milestones for the period from the acquisition date through 2025. When estimating the present value of future cash consideration, the Company accrued an estimated $32.0 million as of the acquisition date for the earnout liability. The Company recorded $11.3 million for customer relationships, $5.4 million for software, $2.5 million for a trade name and $62.4 million of goodwill. Goodwill is primarily related to the acquired workforce and strategic fit and is not deductible for tax purposes. On April 1, 2023, the Company acquired businessfourzero, a next generation consultancy specializing in developing and implementing purpose-driven change. In connection with the acquisition, the Company paid $9.5 million in the second quarter of 2023 with a subsequent purchase price adjustment payment of $2.2 million paid in the third quarter of 2023. The former owners of businessfourzero are eligible to receive additional cash consideration, which the Company estimated on the acquisition date to be between $4.0 million and $8.0 million, to be paid in 2026 based on the achievement of certain revenue and operating income metrics for the period from the acquisition date through 2025. When estimating the present value of future cash consideration, the Company accrued an estimated $4.3 million as of the acquisition date for the earnout liability. The Company recorded $3.5 million for customer relationships, $0.5 million for a trade name, and $7.1 million of goodwill. The goodwill is primarily related to the acquired workforce and strategic fit.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
Goodwill and Other Intangible Assets	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill The Company's goodwill by segment (for the segments that had recorded goodwill) is as follows: March 31, December 31, Executive Search Americas $ 91,547 $ 91,740 Europe 1,460 1,494 Total Executive Search 93,007 93,234 On-Demand Talent 107,082 109,018 Heidrick Consulting 7,246 7,246 Goodwill, gross 207,335 209,498 Accumulated impairment (7,246) (7,246) Total goodwill $ 200,089 $ 202,252 Changes in the carrying amount of goodwill by segment (for the segments that had recorded goodwill) for the three months ended March 31, 2024, are as follows: Executive Search On-Demand Talent Heidrick Consulting Americas Europe Total Goodwill $ 91,740 $ 1,494 $ 109,018 $ 7,246 $ 209,498 Accumulated impairment losses — — — (7,246) (7,246) Balance at December 31, 2023 91,740 1,494 109,018 — 202,252 Foreign currency translation (193) (34) (1,936) — (2,163) Goodwill 91,547 1,460 107,082 7,246 207,335 Accumulated impairment losses — — — (7,246) (7,246) Balance at March 31, 2024 $ 91,547 $ 1,460 $ 107,082 $ — $ 200,089 Other Intangible Assets, net The Company’s other intangible assets, net by segment, are as follows: March 31, December 31, Executive Search Americas $ 17 $ 22 Europe 79 95 Total Executive Search 96 117 On-Demand Talent 15,541 17,689 Heidrick Consulting 2,668 3,036 Total other intangible assets, net $ 18,305 $ 20,842 The carrying amount of amortizable intangible assets and the related accumulated amortization are as follows: Weighted March 31, 2024 December 31, 2023 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Client relationships 10.1 $ 25,819 $ (12,489) $ 13,330 $ 26,195 $ (11,443) $ 14,752 Trade name 3.0 4,996 (3,317) 1,679 5,067 (3,069) 1,998 Software 3.0 8,504 (5,208) 3,296 8,629 (4,537) 4,092 Total intangible assets 8.2 $ 39,319 $ (21,014) $ 18,305 $ 39,891 $ (19,049) $ 20,842 Intangible asset amortization expense for the three months ended March 31, 2024, and 2023, was $2.3 million and $1.9 million, respectively. The Company's estimated future amortization expense related to intangible assets as of March 31, 2024, for the following years ended December 31, is as follows: 2024 $ 5,458 2025 5,863 2026 2,486 2027 1,512 2028 885 Thereafter 2,101 Total $ 18,305

Other Current and Non-current A

Other Current and Non-current Assets and Liabilities	3 Months Ended
Other Current and Non-current Assets and Liabilities	Mar. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Current and Non-current Assets and Liabilities	Other Current and Non-current Assets and Liabilities The components of other current assets are as follows: March 31, December 31, Contract assets $ 33,875 $ 32,092 Other 14,990 15,831 Total other current assets $ 48,865 $ 47,923 The components of other non-current liabilities are as follows: March 31, December 31, Earnout liability $ 38,255 $ 38,601 Other 2,897 3,207 Total other non-current liabilities $ 41,152 $ 41,808
Other Current and Non-current Assets and Liabilities	Other Current and Non-current Assets and Liabilities The components of other current assets are as follows: March 31, December 31, Contract assets $ 33,875 $ 32,092 Other 14,990 15,831 Total other current assets $ 48,865 $ 47,923 The components of other non-current liabilities are as follows: March 31, December 31, Earnout liability $ 38,255 $ 38,601 Other 2,897 3,207 Total other non-current liabilities $ 41,152 $ 41,808

Line of Credit

Line of Credit	3 Months Ended
Line of Credit	Mar. 31, 2024
Debt Disclosure [Abstract]
Line of Credit	Line of Credit On February 24, 2023, the Company entered into the Second Amendment (the “Second Amendment”) to the Credit Agreement, dated as of October 26, 2018 (the “Credit Agreement” and, as amended by the First Amendment to Credit Agreement, dated as of July 13, 2021, and the Second Amendment, the "Amended Credit Agreement") by and among the Company, Bank of America, N.A., as administrative agent, and the lenders party thereto. The Second Amendment changed the interest rate benchmark, from LIBOR to the Secured Overnight Financing Rate (“SOFR”). At the Company's option, borrowings under the Amended Credit Agreement will bear interest at one-, three- or six-month term SOFR, or an alternate base rate as set forth in the Amended Credit Agreement, in each case plus an applicable margin. Additionally, the Amended Credit Agreement provides the Company with a committed unsecured revolving credit facility in an aggregate amount of $200 million, increased in the Second Amendment from $175 million as set forth in the original version of the Credit Agreement, which includes a sublimit of $25 million for letters of credit and a sublimit of $10 million for swingline loans, with a $75 million expansion feature. The Amended Credit Agreement matures on July 13, 2026. Borrowings under the Amended Credit Agreement may be used for working capital, capital expenditures, permitted acquisitions, restricted payments and for other general corporate purposes of the Company and its subsidiaries. The obligations under the Amended Credit Agreement are guaranteed by certain of the Company’s subsidiaries. As of March 31, 2024, and December 31, 2023, the Company had no outstanding borrowings. As of such dates, the Company was in compliance with the financial and other covenants under the Amended Credit Agreement and no event of default existed.

Stock-Based Compensation and Co

Stock-Based Compensation and Common Stock	3 Months Ended
Stock-Based Compensation and Common Stock	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation and Common Stock	Stock-Based Compensation and Common Stock On May 25, 2023, the stockholders of the Company approved an amendment to the Company's Third Amended and Restated 2012 Heidrick & Struggles GlobalShare Program (as so amended, the "Fourth A&R Program") to increase the number of shares of common stock reserved for issuance under the 2012 program by 1,060,000 shares. The Fourth A&R Program provides for grants of stock options, stock appreciation rights, restricted stock units, performance stock units, and other stock-based compensation awards that are valued based upon the grant date fair value of the awards. These awards may be granted to directors, selected employees and independent contractors. As of March 31, 2024, 4,679,904 awards have been issued under the Fourth A&R Program, including 792,136 forfeited awards, and 522,232 shares remain available for future awards. The Fourth A&R Program provides that no awards can be granted after May 25, 2033. The Company measures its stock-based compensation costs based on the grant date fair value of the awards and recognizes these costs over the requisite service period. A summary of information with respect to stock-based compensation is as follows: Three Months Ended 2024 2023 Salaries and benefits (1) $ 3,441 $ 2,597 Income tax benefit related to stock-based compensation included in net income 949 715 (1) Includes $0.8 million of expense related to cash-settled restricted stock units for each of the three months ended March 31, 2024, and 2023. Restricted Stock Units Restricted stock units granted to employees are subject to ratable vesting over a three-year or four-year period dependent upon the terms of the individual grant. Compensation expense related to service-based restricted stock units is recognized on a straight-line basis over the vesting period. Non-employee members of the Board of Directors may elect to receive restricted stock units or shares of common stock annually pursuant to the Fourth A&R Program as part of their annual compensation. Based on their respective elections, the Company issued no restricted stock units for services provided by the non-employee directors during the three months ended March 31, 2024, and 2023, respectively. Restricted stock units issued to non-employee directors remain unvested until the respective non-employee directors retire from the Board of Directors. Restricted stock unit activity for the three months ended March 31, 2024, is as follows: Number of Weighted- Outstanding on December 31, 2023 686,741 $ 30.33 Granted 240,255 33.13 Vested and converted to common stock (110,546) 37.61 Forfeited (7,091) 30.15 Outstanding on March 31, 2024 809,359 $ 30.17 As of March 31, 2024, there was $12.4 million of pre-tax unrecognized compensation expense related to unvested restricted stock units, which is expected to be recognized over a weighted average of 2.6 years. Performance Stock Units The Company grants performance stock units to certain of its senior executives. The majority of performance stock units are subject to cliff vesting at the end of a three-year period. The vesting will vary between 0% and 200% based on the attainment of certain performance and market conditions over the three-year vesting period. Half of the award is based on the achievement of adjusted operating margin or Adjusted EBITDA margin thresholds and half of the award is based on the Company's total shareholder return, relative to a peer group. The fair value of the awards subject to total shareholder return metrics is determined using the Monte Carlo simulation model. A Monte Carlo simulation model uses stock price volatility and other variables to estimate the probability of satisfying the performance conditions and the resulting fair value of the award. The performance stock units are expensed on a straight-line basis over the three-year vesting period. Certain of the Company's senior executives are granted performance stock units that are subject to ratable vesting over a four-year period. The vesting will vary between 0% and 100% of the shares subject to the performance stock units based on the attainment of specified stock price hurdles over the vesting period. The fair value of the awards subject to such stock price hurdles is determined using the Monte Carlo simulation model. The performance stock units are expensed on a straight-line basis over the four-year vesting period. Performance stock unit activity for the three months ended March 31, 2024, is as follows: Number of Weighted- Outstanding on December 31, 2023 239,625 $ 41.91 Granted 273,536 31.50 Vested and converted to common stock (104,154) 44.18 Forfeited (720) 27.82 Outstanding on March 31, 2024 408,287 $ 34.38 As of March 31, 2024, there was $11.1 million of pre-tax unrecognized compensation expense related to unvested performance stock units, which is expected to be recognized over a weighted average of 2.7 years. Phantom Stock Units Phantom stock units are grants of phantom stock with respect to shares of the Company's common stock that are settled in cash and are subject to various restrictions, including restrictions on transferability, vesting and forfeiture provisions. Shares of phantom stock that do not vest for any reason will be forfeited by the recipient and will revert to the Company. Phantom stock units are subject to vesting over a period of four years, and such vesting is subject to certain other conditions, including continued service to the Company. As a result of the cash-settlement feature of the awards, the Company classifies the awards as liability awards, which are measured at fair value at each reporting date and the vested portion of the award is recognized as a liability to the extent that the service condition is deemed probable. The fair value of the phantom stock awards on the balance sheet date is determined using the closing share price of the Company's common stock on that date. The Company recorded phantom stock-based compensation expense of $0.8 million for both the three months ended March 31, 2024, and 2023. Phantom stock unit activity for the three months ended March 31, 2024, is as follows: Number of Outstanding on December 31, 2023 187,301 Granted — Vested — Forfeited — Outstanding on March 31, 2024 187,301 As of March 31, 2024, there was $1.0 million of pre-tax unrecognized compensation expense related to unvested phantom stock units, which is expected to be recognized over a weighted average of 2.1 years. Common Stock Non-employee members of the Board of Directors may elect to receive restricted stock units or shares of common stock annually pursuant to the Fourth A&R Program as part of their annual compensation, which is typically issued in the second quarter each year. The Company issued no shares of common stock for services provided by the non-employee directors during the three months ended March 31, 2024, and 2023, respectively. On February 11, 2008, the Company's Board of Directors authorized management to repurchase shares of the Company's common stock with an aggregate purchase price of up to $50 million (the "Repurchase Authorization"). From time to time and as business conditions warrant, the Company may purchase shares of its common stock on the open market or in negotiated or block trades. No time limit has been set for completion of this program. There were no purchases of common stock during the three months ended March 31, 2023, and 2024. As of March 31, 2024, the Company has purchased 1,074,670 shares of its common stock pursuant to the Repurchase Authorization for a total of $29.2 million and $20.8 million remains available for future purchases under the Repurchase Authorization.

Restructuring

Restructuring	3 Months Ended
Restructuring	Mar. 31, 2024
Restructuring and Related Activities [Abstract]
Restructuring	Restructuring During the year ended December 31, 2020, the Company implemented a restructuring plan (the "2020 Plan") to optimize future growth and profitability. The primary components of the 2020 Plan included a workforce reduction, a reduction of the Company's real estate expenses and professional fees, and the elimination of certain deferred compensation programs. The Company did not incur any charges during the three months ended March 31, 2024, and 2023, and does not anticipate incurring any future charges under the 2020 Plan. Changes in the restructuring accrual for the three months ended March 31, 2023, were as follows: Employee Related Accrual balance at December 31, 2022 3,422 Cash payments (3,516) Exchange rate fluctuations 94 Accrual balance at March 31, 2023 $ —

Income Taxes

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company reported income before taxes of $22.9 million and an income tax provision of $8.9 million for the three months ended March 31, 2024. The Company reported income before taxes of $22.8 million and an income tax provision of $7.2 million for the three months ended March 31, 2023. The effective tax rates for the three months ended March 31, 2024, and 2023, were 38.8% and 31.7%, respectively. The effective tax rate for the three months ended March 31, 2024, was impacted by non-deductible earnout expenses and the mix of income. The effective tax rate for the three months ended March 31, 2023, was impacted by one-time items and the mix of income.

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income (Loss)	3 Months Ended
Changes in Accumulated Other Comprehensive Income (Loss)	Mar. 31, 2024
Equity [Abstract]
Changes in Accumulated Other Comprehensive Income (Loss)	Changes in Accumulated Other Comprehensive Income (Loss) The changes in Accumulated other comprehensive income (loss) (“AOCI”) by component for the three months ended March 31, 2024, are as follows: Available- Foreign Pension AOCI Balance at December 31, 2023 $ 42 $ 647 $ (560) $ 129 Other comprehensive income before reclassification, net of tax (33) (4,058) — (4,091) Balance at March 31, 2024 $ 9 $ (3,411) $ (560) $ (3,962)

Segment Information

Segment Information	3 Months Ended
Segment Information	Mar. 31, 2024
Segment Reporting [Abstract]
Segment Information	Segment Information The Company has five operating segments. The Executive Search business operates in the Americas, Europe (which includes Africa) and Asia Pacific (which includes the Middle East), and the Heidrick Consulting and On-Demand Talent businesses operate globally. In 2023, the Company changed its measure of segment profitability from operating income to Adjusted EBITDA. The following tables include Adjusted EBITDA, which is the measure of segment profitability reported to the chief operating decision maker for purposes of allocating resources to the segments and assessing their performance. For segment purposes, reimbursements of out-of-pocket expenses classified as revenue and other operating income are reported separately and, therefore, are not included in the results of each segment. The Company believes that analyzing trends in revenue before reimbursements (net revenue), analyzing operating expenses as a percentage of net revenue, and analyzing Adjusted EBITDA and Adjusted EBITDA margin more appropriately reflect its core operations. The Company evaluates performance and allocates resources based on the chief operating decision maker’s review of (1) net revenue and (2) net income before interest, taxes, depreciation and amortization, as adjusted, to the extent they occur, for earnout accretion, earnout fair value adjustments, contingent compensation, deferred compensation plan income or expense, certain reorganization costs, impairment charges and restructuring charges ("Adjusted EBITDA"). Adjusted EBITDA margin is defined as Adjusted EBITDA as a percentage of revenue in the same period. Three Months Ended 2024 2023 Revenue before reimbursements (net revenue) $ 265,197 $ 239,317 Net income 14,032 15,586 Interest, net (4,086) (3,249) Other, net (2,571) (1,809) Provision for income taxes 8,899 7,243 Operating income 16,274 17,771 Adjustments Depreciation 2,493 2,004 Intangible amortization 2,297 1,869 Earnout accretion 466 191 Acquisition contingent consideration 1,988 1,659 Deferred compensation plan 2,350 2,133 Total adjustments 9,594 7,856 Adjusted EBITDA $ 25,868 $ 25,627 Adjusted EBITDA margin 9.8 % 10.7 % Revenue and Adjusted EBITDA by segment are as follows: Three Months Ended 2024 2023 Revenue Executive Search Americas $ 136,679 $ 127,327 Europe 41,481 38,931 Asia Pacific 23,321 24,229 Total Executive Search 201,481 190,487 On-Demand Talent 37,857 31,117 Heidrick Consulting 25,859 17,713 Revenue before reimbursements (net revenue) 265,197 239,317 Reimbursements 3,901 2,802 Total revenue $ 269,098 $ 242,119 Three Months Ended 2024 2023 Adjusted EBITDA Executive Search Americas $ 41,871 $ 42,124 Europe 3,353 2,081 Asia Pacific 3,195 3,567 Total Executive Search 48,419 47,772 On-Demand Talent (921) (1,347) Heidrick Consulting (2,027) (2,795) Total segment operating income 45,471 43,630 Research and Development (4,925) (5,251) Global Operations Support (14,678) (12,752) Total Adjusted EBITDA $ 25,868 $ 25,627

Guarantees

Guarantees	3 Months Ended
Guarantees	Mar. 31, 2024
Guarantees and Product Warranties [Abstract]
Guarantees	Guarantees The Company has utilized letters of credit to support certain obligations, primarily for its office lease agreements. The letters of credit were made to secure the respective agreements and are for the terms of the agreements, which extend through 2033. For each letter of credit issued, the Company would have to use cash to fulfill the obligation if there is a default on a payment. The maximum amount of undiscounted payments the Company would be required to make in the event of default on all outstanding letters of credit is approximately $4.8 million as of March 31, 2024. The Company has not accrued for these arrangements as no event of default exists or is expected to exist.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Litigation The Company has contingent liabilities from various pending claims and litigation matters arising in the ordinary course of the Company’s business, some of which involve claims for damages that are substantial in amount. Some of these matters are covered in part by insurance. Based upon information currently available, the Company believes the ultimate resolution of such claims and litigation will not have a material adverse effect on its financial condition, results of operations or liquidity.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2024
Accounting Policies [Abstract]
Cost of Services	Cost of Services Cost of services consists of third-party contractor costs related to the delivery of various services in the Company's On-Demand Talent and Heidrick Consulting operating segments.
Research and Development	Research and Development
Marketable Securities	Marketable Securities The Company’s marketable securities consist of available-for-sale debt securities with original maturities exceeding three months.
Earnings per Common Share	Earnings per Common Share Basic earnings per common share are computed by dividing net income by weighted average common shares outstanding for the period. Diluted earnings per share reflect the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted. Common equivalent shares are excluded from the determination of diluted earnings per share in periods in which they have an anti-dilutive effect.
Leases	Leases The Company determines if an arrangement is a lease at inception. Operating leases are included in Operating lease right-of-use assets , Current liabilities - Operating lease liabilities and Non-current liabilities - Operating lease liabilities in the Company's Condensed Consolidated Balance Sheets. The Company does not have any leases that meet the finance lease criteria. Right-of-use assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent the Company's obligation to make lease payments arising from the lease. Operating lease right-of-use assets and liabilities are recognized on the commencement date based on the present value of lease payments over the lease term. As most of the Company's leases do not provide an implicit rate, an incremental borrowing rate based on the information available at the commencement date is used in determining the present value of lease payments. The operating lease right-of-use asset also includes any lease payments made in advance and any accrued rent expense balances. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the option will be exercised. Lease expense for lease payments is recognized on a straight-line basis over the lease term. The Company has lease agreements with lease and non-lease components. For office leases, the Company accounts for the lease and non-lease components as a single lease component. For equipment leases, such as vehicles and office equipment, the Company accounts for the lease and non-lease components separately.
Recently Issued Financial Accounting Standards	Recently Issued Financial Accounting Standards In December 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures." The standard is intended to expand the disclosure requirements for income taxes, specifically related to the rate reconciliation and income taxes paid. The guidance is effective for annual periods beginning after December 15, 2024, with early adoption permitted. The Company is currently evaluating the impact of this guidance on its financial statements. In November 2023, the FASB issued ASU No. 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” The standard is intended to improve reportable segment disclosure requirements for public business entities primarily through enhanced disclosures about significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit (referred to as the “significant expense principle”). This guidance is effective for annual periods beginning after December 15, 2023, and for interim periods beginning after December 15, 2024. The Company is currently evaluating the impact of this guidance on its financial statements. In March 2020, the Financial Accounting Standards Board issued Accounting Standards Update No. 2020-04, Facilitation of the Effects of Reference Rate Reform on Financial Reporting. The guidance was intended to provide temporary optional expedients and exceptions to the guidance on contract modifications and hedge accounting to ease the financial reporting burdens related to the expected market transition from the London Interbank Offered Rate ("LIBOR") and other interbank offered rates to alternative reference rates. This guidance is effective March 12, 2020, and the Company may elect to apply the amendments prospectively through December 31, 2024. The new guidance is not expected to have a material effect on the Company's financial statements.
Revenue Recognition	Executive Search Revenue is recognized as performance obligations are satisfied by transferring a good or service to a client. Generally, each executive search contract contains one performance obligation which is the process of identifying potentially qualified candidates for a specific client position. In most contracts, the transaction price includes both fixed and variable consideration. Fixed compensation is comprised of a retainer, equal to approximately one-third of the estimated first year compensation for the position to be filled, and indirect expenses, equal to a specified percentage of the retainer, as defined in the contract. The Company generally bills clients for the retainer and indirect expenses in one-third increments over a three-month period commencing in the month of a client’s acceptance of the contract. If actual compensation of a placed candidate exceeds the original compensation estimate, the Company is often authorized to bill the client for one-third of the excess compensation. The Company refers to this additional billing as uptick revenue. In most contracts, variable consideration is comprised of uptick revenue and direct expenses. The Company bills its clients for uptick revenue upon completion of the executive search, and direct expenses are billed as incurred. The Company estimates uptick revenue at contract inception, based on a portfolio approach, utilizing the expected value method based on a historical analysis of uptick revenue realized in the Company’s geographic regions and industry practices, and initially records a contract’s uptick revenue in an amount that is probable not to result in a significant reversal of cumulative revenue recognized when the actual amount of uptick revenue for the contract is known. Differences between the estimated and actual amounts of variable consideration are recorded when known. The Company does not estimate revenue for direct expenses as it is not materially different than recognizing revenue as direct expenses are incurred. Revenue from executive search engagement performance obligations is recognized over time as clients simultaneously receive and consume the benefits provided by the Company's performance. Revenue from executive search engagements is recognized over the expected average period of performance, in proportion to the estimated personnel time incurred to fulfill the obligations under the executive search contract. Revenue is generally recognized over a period of approximately six months. The Company's executive search contracts contain a replacement guarantee which provides for an additional search to be completed, free of charge except for expense reimbursements, should the candidate presented by the Company be hired by the client and subsequently terminated by the client for performance reasons within a specified period of time. The replacement guarantee is an assurance warranty, which is not a performance obligation under the terms of the executive search contract, as the Company does not provide any services under the terms of the guarantee that transfer benefits to the client in excess of assuring that the identified candidate complies with the agreed-upon specifications. The Company accounts for the replacement guarantee under the relevant warranty guidance in Accounting Standards Codification 460 - Guarantees. On-Demand Talent The Company enters into contracts with clients that outline the general terms and conditions of the assignment to provide on-demand consultants for various types of consulting projects, which consultants may be independent contractors or temporary employees. The consideration the Company expects to receive under each contract is dependent on the time-based fees specified in the contract. Revenue from on-demand engagement performance obligations is recognized over time as clients simultaneously receive and consume the benefits provided by the Company's performance. The Company has applied the practical expedient to recognize revenue for these services in the amount to which the Company has a right to invoice the client, as this amount corresponds directly with the value provided to the client for the performance completed to date. For transactions where a third-party contractor is involved in providing the services to the client, the Company reports the revenue and the related direct costs on a gross basis as it has determined that it is the principal in the transaction. The Company is primarily responsible for fulfilling the promise to provide consulting services to its clients and the Company has discretion in establishing the prices charged to clients for the consulting services and is able to contractually obligate the independent service provider to deliver services and deliverables that the Company has agreed to provide to its clients. Heidrick Consulting Revenue is recognized as performance obligations are satisfied by transferring a good or service to a client. Heidrick Consulting enters into contracts with clients that outline the general terms and conditions of the assignment to provide succession planning, executive assessment, top team and board effectiveness and culture shaping programs. The consideration the Company expects to receive under each contract is generally fixed. Most of the Company's consulting contracts contain one performance obligation, which is the overall process of providing the consulting service requested by the client. The majority of the Company's consulting revenue is recognized over time utilizing input methods. Revenue recognition over time for the majority of the Company's consulting engagements is measured by total cost or time incurred as a percentage of the total estimated cost or time on the consulting engagement. Contract Balances Contract assets and liabilities are reported in a net position on a contract-by-contract basis at the end of each reporting period. Contract assets and liabilities are classified as current due to the nature of the Company's contracts, which are completed within one year. Contract assets are included within Other current assets on the Condensed Consolidated Balance Sheets. Unbilled receivables: Unbilled receivables represents contract assets from revenue recognized over time in excess of the amount billed to the client and the amount billed to the client is solely dependent upon the passage of time. This amount includes revenue recognized in excess of billed Executive Search retainers, Heidrick Consulting fees, and On-Demand Talent fees. Contract assets: Contract assets represent revenue recognized over time in excess of the amount billed to the client, and the amount billed to the client is not solely subject to the passage of time. This amount primarily includes revenue recognized for upticks and contingent placement fees in executive search contracts. Deferred revenue: Contract liabilities consist of deferred revenue, which is equal to billings in excess of revenue recognized.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	3 Months Ended
Summary of Significant Accounting Policies (Tables)	Mar. 31, 2024
Accounting Policies [Abstract]
Schedule of Cash and Cash Equivalents	The following table provides a reconciliation of the cash and cash equivalents between the Condensed Consolidated Balance Sheets and the Condensed Consolidated Statements of Cash Flows as of March 31, 2024, and 2023, and December 31, 2023, and 2022: March 31, December 31, 2024 2023 2023 2022 Cash and cash equivalents $ 252,831 $ 204,691 $ 412,618 $ 355,447 Restricted cash included within other non-current assets — 42 — 42 Total cash, cash equivalents and restricted cash $ 252,831 $ 204,733 $ 412,618 $ 355,489
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation of basic and diluted earnings per share: Three Months Ended 2024 2023 Net income $ 14,032 $ 15,586 Weighted average shares outstanding: Basic 20,144 19,904 Effect of dilutive securities: Restricted stock units 593 501 Performance stock units 303 164 Diluted 21,040 20,569 Basic earnings per share $ 0.70 $ 0.78 Diluted earnings per share $ 0.67 $ 0.76

Revenue (Tables)

Revenue (Tables)	3 Months Ended
Revenue (Tables)	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Changes in Contract Asset and Liability	The following table outlines the changes in the contract asset and liability balances from December 31, 2023, to March 31, 2024: March 31, December 31, Change Contract assets Unbilled receivables, net $ 17,335 $ 15,318 $ 2,017 Contract assets 16,540 16,774 (234) Total contract assets 33,875 32,092 1,783 Contract liabilities Deferred revenue $ 47,377 $ 45,732 $ 1,645

Credit Losses (Tables)

Credit Losses (Tables)	3 Months Ended
Credit Losses (Tables)	Mar. 31, 2024
Credit Loss [Abstract]
Schedule of Accounts Receivable, Allowance for Credit Loss	The activity in the allowance for credit losses on the Company's trade receivables is as follows: Balance at December 31, 2023 $ 6,954 Provision for credit losses 1,864 Write-offs (1,267) Foreign currency translation (34) Balance at March 31, 2024 $ 7,517

Property and Equipment, net (Ta

Property and Equipment, net (Tables)	3 Months Ended
Property and Equipment, net (Tables)	Mar. 31, 2024
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment	The components of the Company’s property and equipment are as follows: March 31, December 31, Leasehold improvements $ 48,230 $ 45,050 Office furniture, fixtures and equipment 15,638 14,775 Computer equipment and software 41,140 38,798 Property and equipment, gross 105,008 98,623 Accumulated depreciation (64,556) (62,871) Property and equipment, net $ 40,452 $ 35,752

Leases (Tables)

Leases (Tables)	3 Months Ended
Leases (Tables)	Mar. 31, 2024
Leases [Abstract]
Schedule of Lease Cost	Lease cost components included within Operating expenses - General and administrative expenses in the Condensed Consolidated Statements of Comprehensive Income were as follows: Three Months Ended 2024 2023 Operating lease cost $ 5,637 $ 4,525 Variable lease cost 2,455 $ 1,916 Total lease cost $ 8,092 $ 6,441 Supplemental cash flow information related to the Company's operating leases is as follows for the three months ended March 31: 2024 2023 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 5,539 $ 4,811 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 3,993 $ 2,570
Schedule of Weighted Average Information Related to Leases	The weighted average remaining lease term and weighted average discount rate for operating leases as of March 31, are as follows: 2024 2023 Weighted Average Remaining Lease Term Operating leases 7.3 years 6.3 years Weighted Average Discount Rate Operating leases 4.92 % 3.49 %
Schedule of Future Maturities for Operating Leases	The future maturities of the Company's operating lease liabilities as of March 31, 2024, for the years ended December 31 are as follows: Operating Lease Maturity 2024 $ 15,812 2025 16,952 2026 15,349 2027 15,082 2028 11,676 Thereafter 45,265 Total lease payments 120,136 Less: Interest 21,735 Present value of lease liabilities $ 98,401

Financial Instruments and Fai_2

Financial Instruments and Fair Value (Tables)	3 Months Ended
Financial Instruments and Fair Value (Tables)	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Schedule of Unrealized Gain (Loss) on Investments	The Company's cash, cash equivalents, and marketable securities by significant investment category are as follows: Amortized Cost Unrealized Gains Fair Value Cash and Cash Equivalents Balance at March 31, 2024 Cash $ 168,635 Level 1 (1) : Money market funds 14,018 U.S. Treasury securities $ 70,169 $ 9 $ 70,178 70,178 Total Level 1 70,169 9 70,178 84,196 Total $ 70,169 $ 9 $ 70,178 $ 252,831 Amortized Cost Unrealized Gains Fair Value Cash and Cash Equivalents Marketable Securities Balance at December 31, 2023 Cash $ 221,980 $ — Level 1 (1) : Money market funds 13,906 — U.S. Treasury securities $ 242,228 $ 42 $ 242,270 176,732 65,538 Total Level 1 242,228 42 242,270 190,638 65,538 Total $ 242,228 $ 42 $ 242,270 $ 412,618 $ 65,538 (1) Level 1 – Quoted prices in active markets for identical assets and liabilities.
Schedule of Fair Value, Separate Account Investment	The following tables provide a summary of the fair value measurements for each major category of investments, assets designated for retirement and pension plans and associated liabilities measured at fair value: Balance Sheet Classification Current Assets Non-Current Assets Current Liabilities Non-current Liabilities Fair Value Other Current Assets Assets Designated for Retirement and Pension Plans Investments Other Current Liabilities Retirement and Pension Plans Balance at March 31, 2024 Measured on a recurring basis: Level 1 (1) : U.S. non-qualified deferred compensation plan $ 54,835 $ — $ — $ 54,835 $ — $ — Level 2 (2) : Retirement and pension plan assets 12,114 1,260 10,854 — — — Pension benefit obligation (14,090) — — — (1,260) (12,830) Total Level 2 (1,976) 1,260 10,854 — (1,260) (12,830) Total $ 52,859 $ 1,260 $ 10,854 $ 54,835 $ (1,260) $ (12,830) Balance Sheet Classification Current Assets Non-Current Assets Current Liabilities Non-current Liabilities Fair Value Other Current Assets Assets Designated for Retirement and Pension Plans Investments Other Current Liabilities Retirement and Pension Plans Balance at December 31, 2023 Measured on a recurring basis: Level 1 (1) : U.S. non-qualified deferred compensation plan $ 47,287 $ — $ — $ 47,287 $ — $ — Level 2 (2) : Retirement and pension plan assets 12,394 1,289 11,105 — — — Pension benefit obligation (14,416) — — — (1,289) (13,127) Total Level 2 (2,022) 1,289 11,105 — (1,289) (13,127) Total $ 45,265 $ 1,289 $ 11,105 $ 47,287 $ (1,289) $ (13,127) (1) Level 1 – Quoted prices in active markets for identical assets and liabilities. (2) Level 2 – Quoted prices in active markets for similar assets and liabilities, or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument.
Schedule of Reconciliation of Level 3 Assets and Liabilities	The following table provides a reconciliation of the beginning and ending balance of Level 3 liabilities for the three months ended March 31, 2024: Earnout Contingent Compensation Balance at December 31, 2023 $ (38,601) $ (18,878) Earnout accretion (466) — Compensation expense — (1,988) Payments — 4,821 Foreign currency translation 812 491 Balance at March 31, 2024 $ (38,255) $ (15,554)

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
Goodwill and Other Intangible Assets (Tables)	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill by Segment	The Company's goodwill by segment (for the segments that had recorded goodwill) is as follows: March 31, December 31, Executive Search Americas $ 91,547 $ 91,740 Europe 1,460 1,494 Total Executive Search 93,007 93,234 On-Demand Talent 107,082 109,018 Heidrick Consulting 7,246 7,246 Goodwill, gross 207,335 209,498 Accumulated impairment (7,246) (7,246) Total goodwill $ 200,089 $ 202,252
Schedule of Changes in Carrying Amount of Goodwill by Segment	Changes in the carrying amount of goodwill by segment (for the segments that had recorded goodwill) for the three months ended March 31, 2024, are as follows: Executive Search On-Demand Talent Heidrick Consulting Americas Europe Total Goodwill $ 91,740 $ 1,494 $ 109,018 $ 7,246 $ 209,498 Accumulated impairment losses — — — (7,246) (7,246) Balance at December 31, 2023 91,740 1,494 109,018 — 202,252 Foreign currency translation (193) (34) (1,936) — (2,163) Goodwill 91,547 1,460 107,082 7,246 207,335 Accumulated impairment losses — — — (7,246) (7,246) Balance at March 31, 2024 $ 91,547 $ 1,460 $ 107,082 $ — $ 200,089
Schedule of Indefinite-Lived Intangible Assets	The Company’s other intangible assets, net by segment, are as follows: March 31, December 31, Executive Search Americas $ 17 $ 22 Europe 79 95 Total Executive Search 96 117 On-Demand Talent 15,541 17,689 Heidrick Consulting 2,668 3,036 Total other intangible assets, net $ 18,305 $ 20,842
Schedule of Acquired Finite-Lived Intangible Assets by Major Class	The carrying amount of amortizable intangible assets and the related accumulated amortization are as follows: Weighted March 31, 2024 December 31, 2023 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Client relationships 10.1 $ 25,819 $ (12,489) $ 13,330 $ 26,195 $ (11,443) $ 14,752 Trade name 3.0 4,996 (3,317) 1,679 5,067 (3,069) 1,998 Software 3.0 8,504 (5,208) 3,296 8,629 (4,537) 4,092 Total intangible assets 8.2 $ 39,319 $ (21,014) $ 18,305 $ 39,891 $ (19,049) $ 20,842
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The Company's estimated future amortization expense related to intangible assets as of March 31, 2024, for the following years ended December 31, is as follows: 2024 $ 5,458 2025 5,863 2026 2,486 2027 1,512 2028 885 Thereafter 2,101 Total $ 18,305

Other Current and Non-current_2

Other Current and Non-current Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Other Current Assets	The components of other current assets are as follows: March 31, December 31, Contract assets $ 33,875 $ 32,092 Other 14,990 15,831 Total other current assets $ 48,865 $ 47,923
Schedule of Other Noncurrent Liabilities	The components of other non-current liabilities are as follows: March 31, December 31, Earnout liability $ 38,255 $ 38,601 Other 2,897 3,207 Total other non-current liabilities $ 41,152 $ 41,808

Stock-Based Compensation and _2

Stock-Based Compensation and Common Stock (Tables)	3 Months Ended
Stock-Based Compensation and Common Stock (Tables)	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Share-based Payment Arrangement, Expensed and Capitalized, Amount	A summary of information with respect to stock-based compensation is as follows: Three Months Ended 2024 2023 Salaries and benefits (1) $ 3,441 $ 2,597 Income tax benefit related to stock-based compensation included in net income 949 715 (1) Includes $0.8 million of expense related to cash-settled restricted stock units for each of the three months ended March 31, 2024, and 2023.
Schedule of Share-based Payment Arrangement, Restricted Stock Unit, Activity	Restricted stock unit activity for the three months ended March 31, 2024, is as follows: Number of Weighted- Outstanding on December 31, 2023 686,741 $ 30.33 Granted 240,255 33.13 Vested and converted to common stock (110,546) 37.61 Forfeited (7,091) 30.15 Outstanding on March 31, 2024 809,359 $ 30.17
Schedule of Performance Stock Unit Activity	Performance stock unit activity for the three months ended March 31, 2024, is as follows: Number of Weighted- Outstanding on December 31, 2023 239,625 $ 41.91 Granted 273,536 31.50 Vested and converted to common stock (104,154) 44.18 Forfeited (720) 27.82 Outstanding on March 31, 2024 408,287 $ 34.38
Schedule of Share-Based Compensation, Phantom Shares Award Outstanding Activity	Phantom stock unit activity for the three months ended March 31, 2024, is as follows: Number of Outstanding on December 31, 2023 187,301 Granted — Vested — Forfeited — Outstanding on March 31, 2024 187,301

Restructuring (Tables)

Restructuring (Tables)	3 Months Ended
Restructuring (Tables)	Mar. 31, 2024
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Reserve by Type of Cost	Changes in the restructuring accrual for the three months ended March 31, 2023, were as follows: Employee Related Accrual balance at December 31, 2022 3,422 Cash payments (3,516) Exchange rate fluctuations 94 Accrual balance at March 31, 2023 $ —

Changes in Accumulated Other _2

Changes in Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2024
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The changes in Accumulated other comprehensive income (loss) (“AOCI”) by component for the three months ended March 31, 2024, are as follows: Available- Foreign Pension AOCI Balance at December 31, 2023 $ 42 $ 647 $ (560) $ 129 Other comprehensive income before reclassification, net of tax (33) (4,058) — (4,091) Balance at March 31, 2024 $ 9 $ (3,411) $ (560) $ (3,962)

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	Three Months Ended 2024 2023 Revenue before reimbursements (net revenue) $ 265,197 $ 239,317 Net income 14,032 15,586 Interest, net (4,086) (3,249) Other, net (2,571) (1,809) Provision for income taxes 8,899 7,243 Operating income 16,274 17,771 Adjustments Depreciation 2,493 2,004 Intangible amortization 2,297 1,869 Earnout accretion 466 191 Acquisition contingent consideration 1,988 1,659 Deferred compensation plan 2,350 2,133 Total adjustments 9,594 7,856 Adjusted EBITDA $ 25,868 $ 25,627 Adjusted EBITDA margin 9.8 % 10.7 % Revenue and Adjusted EBITDA by segment are as follows: Three Months Ended 2024 2023 Revenue Executive Search Americas $ 136,679 $ 127,327 Europe 41,481 38,931 Asia Pacific 23,321 24,229 Total Executive Search 201,481 190,487 On-Demand Talent 37,857 31,117 Heidrick Consulting 25,859 17,713 Revenue before reimbursements (net revenue) 265,197 239,317 Reimbursements 3,901 2,802 Total revenue $ 269,098 $ 242,119 Three Months Ended 2024 2023 Adjusted EBITDA Executive Search Americas $ 41,871 $ 42,124 Europe 3,353 2,081 Asia Pacific 3,195 3,567 Total Executive Search 48,419 47,772 On-Demand Talent (921) (1,347) Heidrick Consulting (2,027) (2,795) Total segment operating income 45,471 43,630 Research and Development (4,925) (5,251) Global Operations Support (14,678) (12,752) Total Adjusted EBITDA $ 25,868 $ 25,627

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Reconciliation of Cash and Cash Equivalents between Balance Sheet and Cash Flow Statements (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Cash and cash equivalents	$ 252,831	$ 412,618	$ 204,691	$ 355,447
Restricted cash included within other non-current assets	0	0	42	42
Total cash, cash equivalents and restricted cash	$ 252,831	$ 412,618	$ 204,733	$ 355,489

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 14,032	$ 15,586
Weighted average shares outstanding:
Basic (in shares)	20,144	19,904
Diluted (in shares)	21,040	20,569
Basic earnings per share (in dollars per share)	$ 0.70	$ 0.78
Diluted earnings per share (in dollars per share)	$ 0.67	$ 0.76
Restricted stock units
Weighted average shares outstanding:
Effect of dilutive securities:	593	501
Performance stock units
Weighted average shares outstanding:
Effect of dilutive securities:	303	164

Revenue - Narrative (Details)

Revenue - Narrative (Details) $ in Millions	3 Months Ended
Revenue - Narrative (Details) $ in Millions	Mar. 31, 2024 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, performance obligation, description of timing	six months
Deferred revenue recognized	$ 31.2
Contract with customer, performance obligation satisfied in previous period	$ 10.1

Revenue - Summary of Changes in

Revenue - Summary of Changes in Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Contract assets
Unbilled receivables, net	$ 17,335	$ 15,318
Contract assets	16,540	16,774
Total contract assets	33,875	32,092
Contract liabilities
Deferred revenue	47,377	$ 45,732
Change in contract assets
Unbilled receivables, net	2,017
Contract assets	(234)
Total contract assets	1,783
Change in contract liabilities
Deferred revenue	$ 1,645

Credit Losses - Schedule of Acc

Credit Losses - Schedule of Accounts Receivable, Allowance for Credit Loss (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2023	$ 6,954
Provision for credit losses	1,864
Write-offs	(1,267)
Foreign currency translation	(34)
Balance at March 31, 2024	$ 7,517

Credit Losses - Narrative (Deta

Credit Losses - Narrative (Details) - position	Mar. 31, 2024	Dec. 31, 2023
Credit Loss [Abstract]
Number of positions in unrealized loss	0	0

Property and Equipment, net - S

Property and Equipment, net - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 105,008	$ 98,623
Accumulated depreciation	(64,556)	(62,871)
Property and equipment, net	40,452	35,752
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	48,230	45,050
Office furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,638	14,775
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 41,140	$ 38,798

Property and Equipment, net - N

Property and Equipment, net - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Property, Plant and Equipment [Abstract]
Depreciation	$ 2,493	$ 2,004

Leases - Narrative (Details)

Leases - Narrative (Details)	Mar. 31, 2024
Minimum \| Building
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract (in years)	1 year
Minimum \| Equipment
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract (in years)	1 year
Maximum \| Building
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract (in years)	11 years 7 months 6 days
Maximum \| Equipment
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract (in years)	4 years 10 months 24 days

Leases - Schedule of Lease Cost

Leases - Schedule of Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Leases [Abstract]
Operating lease cost	$ 5,637	$ 4,525
Variable lease cost	2,455	1,916
Total lease cost	$ 8,092	$ 6,441

Leases - Schedule Of Cash Flow

Leases - Schedule Of Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Leases [Abstract]
Operating cash flows from operating leases	$ 5,539	$ 4,811
Right-of-use assets obtained in exchange for lease obligations:	$ 3,993	$ 2,570

Leases - Schedule of Weighted A

Leases - Schedule of Weighted Average Information Related to Leases (Details)	Mar. 31, 2024	Mar. 31, 2023
Leases [Abstract]
Weighted Average Remaining Lease Term	7 years 3 months 18 days	6 years 3 months 18 days
Weighted Average Discount Rate	4.92%	3.49%

Leases - Schedule of Future Mat

Leases - Schedule of Future Maturities for Operating Leases (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Leases [Abstract]
2024	$ 15,812
2025	16,952
2026	15,349
2027	15,082
2028	11,676
Thereafter	45,265
Total lease payments	120,136
Less: Interest	21,735
Present value of lease liabilities	$ 98,401

Financial Instruments and Fai_3

Financial Instruments and Fair Value - Schedule of Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	$ 70,169	$ 242,228
Unrealized Gains	9	42
Fair Value	70,178	242,270
Cash and cash equivalents	252,831	412,618	$ 204,691	$ 355,447
Marketable Securities		65,538
Cash
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable Securities		0
Fair Value, Inputs, Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	70,169	242,228
Unrealized Gains	9	42
Fair Value	70,178	242,270
Cash and cash equivalents	84,196	190,638
Marketable Securities		65,538
Fair Value, Inputs, Level 1 \| Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	14,018	13,906
Marketable Securities		0
Fair Value, Inputs, Level 1 \| U.S. Treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	70,169	242,228
Unrealized Gains	9	42
Fair Value	70,178	242,270
Cash and cash equivalents	70,178	176,732
Marketable Securities		65,538
Cash
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 168,635	$ 221,980

Financial Instruments and Fai_4

Financial Instruments and Fair Value - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate cost basis for non-qualified deferred compensation plan	$ 42,500	$ 37,200
Acquisition earnout accruals, non-current	38,255	38,601
Earnout \| Fair Value, Inputs, Level 3 \| Non-Current and Other Non-Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition earnout accruals, non-current	38,300	38,600
Contingent Compensation \| Fair Value, Inputs, Level 3 \| Current Accrued Salaries and Benefits
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition earnout accruals, current	4,100	6,000
Contingent Compensation \| Fair Value, Inputs, Level 3 \| Non-Current Accrued Salaries and Benefits
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition earnout accruals, non-current	$ 11,400	$ 12,900

Financial Instruments and Fai_5

Financial Instruments and Fair Value - Schedule of Fair Value, Separate Account Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	$ 52,859	$ 45,265
Other Current Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	1,260	1,289
Assets Designated for Retirement and Pension Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	10,854	11,105
Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	54,835	47,287
Other Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	(1,260)	(1,289)
Retirement and Pension Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	(12,830)	(13,127)
Fair Value, Inputs, Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. non-qualified deferred compensation plan	54,835	47,287
Fair Value, Inputs, Level 1 \| Other Current Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. non-qualified deferred compensation plan	0	0
Fair Value, Inputs, Level 1 \| Assets Designated for Retirement and Pension Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. non-qualified deferred compensation plan	0	0
Fair Value, Inputs, Level 1 \| Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. non-qualified deferred compensation plan	54,835	47,287
Fair Value, Inputs, Level 1 \| Other Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. non-qualified deferred compensation plan	0	0
Fair Value, Inputs, Level 1 \| Retirement and Pension Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. non-qualified deferred compensation plan	0	0
Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retirement and pension plan assets	12,114	12,394
Pension benefit obligation	(14,090)	(14,416)
Total	(1,976)	(2,022)
Fair Value, Inputs, Level 2 \| Other Current Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retirement and pension plan assets	1,260	1,289
Pension benefit obligation	0	0
Total	1,260	1,289
Fair Value, Inputs, Level 2 \| Assets Designated for Retirement and Pension Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retirement and pension plan assets	10,854	11,105
Pension benefit obligation	0	0
Total	10,854	11,105
Fair Value, Inputs, Level 2 \| Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retirement and pension plan assets	0	0
Pension benefit obligation	0	0
Total	0	0
Fair Value, Inputs, Level 2 \| Other Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retirement and pension plan assets	0	0
Pension benefit obligation	(1,260)	(1,289)
Total	(1,260)	(1,289)
Fair Value, Inputs, Level 2 \| Retirement and Pension Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Retirement and pension plan assets	0	0
Pension benefit obligation	(12,830)	(13,127)
Total	$ (12,830)	$ (13,127)

Financial Instruments and Fai_6

Financial Instruments and Fair Value - Schedule of Reconciliation of Level 3 Assets and Liabilities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Recurring Basis Unobservable Input Reconciliation Liability Gain Loss Statement Of Income Extensible List Not Disclosed Flag	Compensation expense
Fair Value Recurring Basis Unobservable Input Reconciliation Liability Gain Loss Statement Of Other Comprehensive Income Extensible List Not Disclosed Flag	Foreign currency translation
Earnout
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at December 31, 2023	$ (38,601)
Earnout accretion	(466)
Compensation expense	0
Payments	0
Foreign currency translation	812
Balance at March 31, 2024	(38,255)
Contingent Compensation
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at December 31, 2023	(18,878)
Earnout accretion	0
Compensation expense	(1,988)
Payments	4,821
Foreign currency translation	491
Balance at March 31, 2024	$ (15,554)

Acquisitions (Details)

Acquisitions (Details) - USD ($) $ in Thousands			3 Months Ended
Acquisitions (Details) - USD ($) $ in Thousands	Apr. 01, 2023	Feb. 01, 2023	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023
Business Acquisition [Line Items]
Payments to acquire businesses, gross			$ 0				$ 29,907
Goodwill			$ 200,089	$ 202,252
Atreus
Business Acquisition [Line Items]
Payments to acquire businesses, gross				$ 12,100			$ 33,400
Future consideration, minimum		$ 30,000
Future consideration, maximum		40,000
Goodwill		62,400
Atreus \| Earnout \| Fair Value, Inputs, Level 3
Business Acquisition [Line Items]
Acquisition earnout accrued		32,000
Atreus \| Client relationships
Business Acquisition [Line Items]
Finite-lived intangibles acquired		11,300
Atreus \| Software
Business Acquisition [Line Items]
Finite-lived intangibles acquired		5,400
Atreus \| Trade name
Business Acquisition [Line Items]
Finite-lived intangibles acquired		$ 2,500
BusinessFourZero
Business Acquisition [Line Items]
Payments to acquire businesses, gross					$ 2,200	$ 9,500
Future consideration, minimum	$ 4,000
Future consideration, maximum	8,000
Goodwill	7,100
BusinessFourZero \| Earnout \| Fair Value, Inputs, Level 3
Business Acquisition [Line Items]
Acquisition earnout accrued	4,300
BusinessFourZero \| Client relationships
Business Acquisition [Line Items]
Finite-lived intangibles acquired	3,500
BusinessFourZero \| Trade name
Business Acquisition [Line Items]
Finite-lived intangibles acquired	$ 500

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Schedule of Goodwill by Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Goodwill [Line Items]
Goodwill, gross	$ 207,335	$ 209,498
Accumulated impairment losses	(7,246)	(7,246)
Goodwill	200,089	202,252
Executive Search
Goodwill [Line Items]
Goodwill, gross	93,007	93,234
Executive Search \| Americas
Goodwill [Line Items]
Goodwill, gross	91,547	91,740
Accumulated impairment losses	0	0
Goodwill	91,547	91,740
Executive Search \| Europe
Goodwill [Line Items]
Goodwill, gross	1,460	1,494
Accumulated impairment losses	0	0
Goodwill	1,460	1,494
On-Demand Talent
Goodwill [Line Items]
Goodwill, gross	107,082	109,018
Accumulated impairment losses	0	0
Goodwill	107,082	109,018
Heidrick Consulting
Goodwill [Line Items]
Goodwill, gross	7,246	7,246
Accumulated impairment losses	(7,246)	(7,246)
Goodwill	$ 0	$ 0

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 202,252
Foreign currency translation	(2,163)
Goodwill, ending balance	200,089
Accumulated impairment losses	(7,246)	$ (7,246)
Goodwill, gross	207,335	209,498
Executive Search
Goodwill [Roll Forward]
Goodwill, gross	93,007	93,234
On-Demand Talent
Goodwill [Roll Forward]
Goodwill, beginning balance	109,018
Foreign currency translation	(1,936)
Goodwill, ending balance	107,082
Accumulated impairment losses	0	0
Goodwill, gross	107,082	109,018
Heidrick Consulting
Goodwill [Roll Forward]
Goodwill, beginning balance	0
Foreign currency translation	0
Goodwill, ending balance	0
Accumulated impairment losses	(7,246)	(7,246)
Goodwill, gross	7,246	7,246
Americas \| Executive Search
Goodwill [Roll Forward]
Goodwill, beginning balance	91,740
Foreign currency translation	(193)
Goodwill, ending balance	91,547
Accumulated impairment losses	0	0
Goodwill, gross	91,547	91,740
Europe \| Executive Search
Goodwill [Roll Forward]
Goodwill, beginning balance	1,494
Foreign currency translation	(34)
Goodwill, ending balance	1,460
Accumulated impairment losses	0	0
Goodwill, gross	$ 1,460	$ 1,494

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Schedule of Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets, net	$ 18,305	$ 20,842
Executive Search
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets, net	96	117
On-Demand Talent
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets, net	15,541	17,689
Heidrick Consulting
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets, net	2,668	3,036
Americas \| Executive Search
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets, net	17	22
Europe \| Executive Search
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets, net	$ 79	$ 95

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets - Schedule of Acquired Finite-Lived Intangible Assets by Major Class (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	8 years 2 months 12 days
Gross Carrying Amount	$ 39,319	$ 39,891
Accumulated Amortization	(21,014)	(19,049)
Total other intangible assets, net	$ 18,305	20,842
Client relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	10 years 1 month 6 days
Gross Carrying Amount	$ 25,819	26,195
Accumulated Amortization	(12,489)	(11,443)
Total other intangible assets, net	$ 13,330	14,752
Trade name
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	3 years
Gross Carrying Amount	$ 4,996	5,067
Accumulated Amortization	(3,317)	(3,069)
Total other intangible assets, net	$ 1,679	1,998
Software
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	3 years
Gross Carrying Amount	$ 8,504	8,629
Accumulated Amortization	(5,208)	(4,537)
Total other intangible assets, net	$ 3,296	$ 4,092

Goodwill and Other Intangible_7

Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible amortization	$ 2,297	$ 1,869

Goodwill and Other Intangible_8

Goodwill and Other Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
2024	$ 5,458
2025	5,863
2026	2,486
2027	1,512
2028	885
Thereafter	2,101
Total other intangible assets, net	$ 18,305	$ 20,842

Other Current and Non-current_3

Other Current and Non-current Assets and Liabilities - Schedule of Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Contract assets	$ 33,875	$ 32,092
Other	14,990	15,831
Other current assets	$ 48,865	$ 47,923

Other Current and Non-current_4

Other Current and Non-current Assets and Liabilities - Schedule of Other Non-Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Earnout liability	$ 38,255	$ 38,601
Other	2,897	3,207
Other non-current liabilities	$ 41,152	$ 41,808

Line of Credit (Details)

Line of Credit (Details) - The Credit Agreement - Line of Credit - USD ($)	Feb. 24, 2023	Mar. 31, 2024	Dec. 31, 2023	Feb. 23, 2023
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 200,000,000			$ 175,000,000
Expansion borrowing capacity	75,000,000
Outstanding borrowings		$ 0	$ 0
Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	25,000,000
Bridge Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 10,000,000

Stock-Based Compensation and _3

Stock-Based Compensation and Common Stock - Narrative (Details) - USD ($)		3 Months Ended
	May 25, 2023	Mar. 31, 2024	Mar. 31, 2023	Feb. 11, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized (in shares)	1,060,000
Awards issued to date (in shares)		4,679,904
Awards forfeited to date (in shares)		792,136
Awards available for grant (in shares)		522,232
Shares issued for services (in shares)		0	0
Stock repurchase program, authorized amount				$ 50,000,000
Repurchase of common stock (in shares)		0	0
Total shares acquired to date (in shares)		1,074,670
Total shares acquired to date		$ 29,200,000
Remaining authorized repurchase amount		$ 20,800,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for services (in shares)		0	0
Unrecognized compensation expense		$ 12,400,000
Period for recognition (in years)		2 years 7 months 6 days
Share-based payment arrangement, expense		$ (800,000)	$ (800,000)
Restricted stock units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		3 years
Restricted stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		4 years
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		4 years
Unrecognized compensation expense		$ 11,100,000
Period for recognition (in years)		2 years 8 months 12 days
Performance stock units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage		0%
Performance stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage		100%
Phantom share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		4 years
Unrecognized compensation expense		$ 1,000,000
Period for recognition (in years)		2 years 1 month 6 days
Share-based payment arrangement, expense		$ 800,000	$ 800,000
Executive Officer \| Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		3 years
Executive Officer \| Performance stock units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage		0%
Executive Officer \| Performance stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage		200%

Stock-Based Compensation and _4

Stock-Based Compensation and Common Stock - Summary of Information Related to Stock-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income tax benefit related to stock-based compensation included in net income	$ 949	$ 715
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense	(800)	(800)
Salaries and benefits
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salaries and benefits	$ 3,441	$ 2,597

Stock-Based Compensation and _5

Stock-Based Compensation and Common Stock - Schedule of Restricted Stock Unit Activity (Details) - Restricted stock units	3 Months Ended
	Mar. 31, 2024 $ / shares shares
Number of Restricted Stock Units
Outstanding on beginning balance (in shares) \| shares	686,741
Granted (in shares) \| shares	240,255
Vested and converted to common stock (in shares) \| shares	(110,546)
Forfeited (in shares) \| shares	(7,091)
Outstanding on ending balance (in shares) \| shares	809,359
Weighted- Average Grant-Date Fair Value
Outstanding on beginning balance (in dollars per share) \| $ / shares	$ 30.33
Granted (in dollars per share) \| $ / shares	33.13
Vested and converted to common stock (in dollars per share) \| $ / shares	37.61
Forfeited (in dollars per share) \| $ / shares	30.15
Outstanding on ending balance (in dollars per share) \| $ / shares	$ 30.17

Stock-Based Compensation and _6

Stock-Based Compensation and Common Stock - Schedule of Performance Stock Unit Activity (Details) - Performance stock units	3 Months Ended
	Mar. 31, 2024 $ / shares shares
Number of Performance Stock Units
Outstanding on beginning balance (in shares) \| shares	239,625
Granted (in shares) \| shares	273,536
Vested and converted to common stock (in shares) \| shares	(104,154)
Forfeited (in shares) \| shares	(720)
Outstanding on ending balance (in shares) \| shares	408,287
Weighted- Average Grant-Date Fair Value
Outstanding on beginning balance (in dollars per share) \| $ / shares	$ 41.91
Granted (in dollars per share) \| $ / shares	31.50
Vested and converted to common stock (in dollars per share) \| $ / shares	44.18
Forfeited (in dollars per share) \| $ / shares	27.82
Outstanding on ending balance (in dollars per share) \| $ / shares	$ 34.38

Stock-Based Compensation and _7

Stock-Based Compensation and Common Stock - Schedule of Phantom Stock Unit Activity (Details) - Phantom share units	3 Months Ended
	Mar. 31, 2024 shares
Number of Phantom Stock Units
Outstanding on beginning balance (in shares)	187,301
Granted (in shares)	0
Vested (in shares)	0
Forfeited (in shares)	0
Outstanding on ending balance (in shares)	187,301

Restructuring - Narrative (Deta

Restructuring - Narrative (Details) - USD ($)	3 Months Ended
Restructuring - Narrative (Details) - USD ($)	Mar. 31, 2024	Mar. 31, 2023
Restructuring and Related Activities [Abstract]
Restructuring charges	$ 0	$ 0

Restructuring - Schedule of Res

Restructuring - Schedule of Restructuring and Related Costs (Details) - Employee Related $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Restructuring Reserve [Roll Forward]
Accrual balance at December 31, 2022	$ 3,422
Cash payments	(3,516)
Exchange rate fluctuations	94
Accrual balance at March 31, 2023	$ 0

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Income before income taxes	$ 22,931	$ 22,829
Provision for income taxes	$ 8,899	$ 7,243
Effective income tax rate reconciliation, percent	38.80%	31.70%

Changes in Accumulated Other _3

Changes in Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 462,278
Other comprehensive income before reclassification, net of tax	(4,091)
Ending balance	468,785
Available- for- Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	42
Other comprehensive income before reclassification, net of tax	(33)
Ending balance	9
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	647
Other comprehensive income before reclassification, net of tax	(4,058)
Ending balance	(3,411)
Pension
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(560)
Other comprehensive income before reclassification, net of tax	0
Ending balance	(560)
AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	129
Ending balance	$ (3,962)

Segment Information - Narrative

Segment Information - Narrative (Details)	3 Months Ended
Segment Information - Narrative (Details)	Mar. 31, 2024 operatingSegment
Segment Reporting [Abstract]
Number of operating segments	5

Segment Information - Adjusted

Segment Information - Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting [Abstract]
Revenue before reimbursements (net revenue)	$ 265,197	$ 239,317
Net income	14,032	15,586
Interest, net	(4,086)	(3,249)
Other, net	(2,571)	(1,809)
Provision for income taxes	8,899	7,243
Operating income	16,274	17,771
Depreciation	2,493	2,004
Intangible amortization	2,297	1,869
Earnout accretion	466	191
Acquisition contingent consideration	1,988	1,659
Deferred compensation plan	2,350	2,133
Total adjustments	9,594	7,856
Adjusted EBITDA	$ 25,868	$ 25,627
Adjusted EBITDA margin	9.80%	10.70%

Segment Information - Schedule

Segment Information - Schedule of Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	$ 265,197	$ 239,317
Reimbursements	3,901	2,802
Total revenue	269,098	242,119
Adjusted EBITDA	25,868	25,627
Total Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	45,471	43,630
Executive Search Segment
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	201,481	190,487
Adjusted EBITDA	48,419	47,772
Executive Search Segment \| Americas
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	136,679	127,327
Adjusted EBITDA	41,871	42,124
Executive Search Segment \| Europe
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	41,481	38,931
Adjusted EBITDA	3,353	2,081
Executive Search Segment \| Asia Pacific
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	23,321	24,229
Adjusted EBITDA	3,195	3,567
On-Demand Talent Segment
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	37,857	31,117
Adjusted EBITDA	(921)	(1,347)
Heidrick Consulting
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	25,859	17,713
Adjusted EBITDA	(2,027)	(2,795)
Research And Development Segment
Segment Reporting Information [Line Items]
Adjusted EBITDA	(4,925)	(5,251)
Global Operations Support
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ (14,678)	$ (12,752)

Guarantees (Details)

Guarantees (Details) $ in Millions	Mar. 31, 2024 USD ($)
Guarantees and Product Warranties [Abstract]
Guarantor obligations, maximum exposure, undiscounted	$ 4.8