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Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 4,847	$ 4,790
Capital expenditures	2,734	6,173
Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	3,260	3,866
Capital expenditures	1,033	3,952
Operating Segments | Executive Search
Segment Reporting Information [Line Items]
Depreciation and amortization	1,187	1,258
Capital expenditures	853	2,907
Operating Segments | On-Demand Talent
Segment Reporting Information [Line Items]
Depreciation and amortization	1,498	1,966
Capital expenditures	71	217
Operating Segments | Heidrick Consulting
Segment Reporting Information [Line Items]
Depreciation and amortization	575	642
Capital expenditures	109	828
Operating Segments | Americas | Executive Search
Segment Reporting Information [Line Items]
Depreciation and amortization	523	761
Capital expenditures	386	513
Operating Segments | Europe | Executive Search
Segment Reporting Information [Line Items]
Depreciation and amortization	421	295
Capital expenditures	395	1,969
Operating Segments | Asia Pacific | Executive Search
Segment Reporting Information [Line Items]
Depreciation and amortization	243	202
Capital expenditures	72	425
Research and development
Segment Reporting Information [Line Items]
Depreciation and amortization	1,437	754
Capital expenditures	1,625	1,839
Global Operations Support
Segment Reporting Information [Line Items]
Depreciation and amortization	150	170
Capital expenditures	$ 76	$ 382

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