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Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 5,015	$ 3,910	$ 9,862	$ 8,700
Capital expenditures	3,906	10,365	6,640	16,538
Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	3,345	2,980	6,606	6,847
Capital expenditures	2,006	8,013	3,039	11,965
Operating Segments | Executive Search
Segment Reporting Information [Line Items]
Depreciation and amortization	1,341	880	2,527	2,140
Capital expenditures	1,878	5,518	2,731	8,425
Operating Segments | On-Demand Talent
Segment Reporting Information [Line Items]
Depreciation and amortization	1,474	1,651	2,974	3,616
Capital expenditures	109	442	180	659
Operating Segments | Heidrick Consulting
Segment Reporting Information [Line Items]
Depreciation and amortization	530	449	1,105	1,091
Capital expenditures	19	2,053	128	2,881
Operating Segments | Americas | Executive Search
Segment Reporting Information [Line Items]
Depreciation and amortization	647	723	1,170	1,486
Capital expenditures	1,214	519	1,600	1,032
Operating Segments | Europe | Executive Search
Segment Reporting Information [Line Items]
Depreciation and amortization	442	42	863	337
Capital expenditures	639	4,418	1,034	6,387
Operating Segments | Asia Pacific | Executive Search
Segment Reporting Information [Line Items]
Depreciation and amortization	252	115	494	317
Capital expenditures	25	581	97	1,006
Research and development
Segment Reporting Information [Line Items]
Depreciation and amortization	1,501	809	2,938	1,563
Capital expenditures	1,827	1,255	3,452	3,094
Global Operations Support
Segment Reporting Information [Line Items]
Depreciation and amortization	169	121	318	290
Capital expenditures	$ 73	$ 1,097	$ 149	$ 1,479

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