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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)

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