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Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 5,383	$ 4,950	$ 15,245	$ 13,650
Capital expenditures	5,501	6,504	12,141	23,042
Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	3,506	3,745	10,112	10,592
Capital expenditures	3,336	4,318	6,375	17,292
Operating Segments | Executive Search
Segment Reporting Information [Line Items]
Depreciation and amortization	1,383	1,407	3,910	3,547
Capital expenditures	2,816	4,122	5,547	16,904
Operating Segments | On-Demand Talent
Segment Reporting Information [Line Items]
Depreciation and amortization	1,521	1,735	4,495	5,351
Capital expenditures	159	196	339	376
Operating Segments | Heidrick Consulting
Segment Reporting Information [Line Items]
Depreciation and amortization	602	603	1,707	1,694
Capital expenditures	361	0	489	12
Operating Segments | Americas | Executive Search
Segment Reporting Information [Line Items]
Depreciation and amortization	718	746	1,888	2,232
Capital expenditures	1,873	2,647	3,473	3,679
Operating Segments | Europe | Executive Search
Segment Reporting Information [Line Items]
Depreciation and amortization	411	409	1,274	746
Capital expenditures	840	768	1,874	11,512
Operating Segments | Asia Pacific | Executive Search
Segment Reporting Information [Line Items]
Depreciation and amortization	254	252	748	569
Capital expenditures	103	707	200	1,713
Research and development
Segment Reporting Information [Line Items]
Depreciation and amortization	1,737	1,029	4,675	2,592
Capital expenditures	2,145	2,171	5,597	5,265
Global Operations Support
Segment Reporting Information [Line Items]
Depreciation and amortization	140	176	458	466
Capital expenditures	$ 20	$ 15	$ 169	$ 485

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