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Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Depreciation and amortization $ 18,857 $ 18,508 $ 10,603
Capital expenditures 26,315 13,433 11,134
Operating Segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 14,255 15,787 9,622
Capital expenditures 18,666 5,753 4,930
Research and development      
Segment Reporting Information [Line Items]      
Depreciation and amortization 3,957 2,073 524
Capital expenditures 7,083 7,170 4,878
Global Operations Support      
Segment Reporting Information [Line Items]      
Depreciation and amortization 645 648 457
Capital expenditures 566 510 1,326
Executive Search Segment | Operating Segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 4,914 5,411 6,075
Capital expenditures 17,957 4,796 4,070
On-Demand Talent | Operating Segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 7,047 8,197 2,669
Capital expenditures 586 398 732
Heidrick Consulting | Operating Segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 2,294 2,179 878
Capital expenditures 123 559 128
Americas | Executive Search Segment | Operating Segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 2,918 3,092 3,498
Capital expenditures 3,846 2,351 1,890
Europe | Executive Search Segment | Operating Segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 1,165 1,343 1,451
Capital expenditures 12,326 1,827 683
Asia Pacific | Executive Search Segment | Operating Segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 831 976 1,126
Capital expenditures $ 1,785 $ 618 $ 1,497