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Segment Information - Schedule of Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	$ 278,559	$ 263,160	$ 822,382	$ 773,702
Reimbursements	4,256	4,736	12,408	10,090
Total revenue	282,815	267,896	834,790	783,792
Adjusted EBITDA	30,415	29,349	85,094	89,860
Total Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	51,472	48,037	146,611	145,757
Executive Search
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	204,389	198,814	615,837	596,080
Adjusted EBITDA	50,734	51,008	151,845	151,945
Executive Search | Americas
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	134,545	132,320	418,302	398,210
Adjusted EBITDA	40,465	39,354	130,448	127,557
Executive Search | Europe
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	43,143	44,606	124,706	129,104
Adjusted EBITDA	5,022	8,950	11,215	16,487
Executive Search | Asia Pacific
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	26,701	21,888	72,829	68,766
Adjusted EBITDA	5,247	2,704	10,182	7,901
On-Demand Talent
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	46,231	41,053	125,983	111,410
Adjusted EBITDA	1,763	(580)	(787)	660
Heidrick Consulting
Segment Reporting Information [Line Items]
Revenue before reimbursements (net revenue)	27,939	23,293	80,562	66,212
Adjusted EBITDA	(1,025)	(2,391)	(4,447)	(6,848)
Research And Development Segment
Segment Reporting Information [Line Items]
Adjusted EBITDA	(4,606)	(4,927)	(14,312)	(15,396)
Global Operations Support
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ (16,451)	$ (13,761)	$ (47,205)	$ (40,501)

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