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Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Revenue before reimbursements (net revenue) $ 1,026,864 $ 1,073,464 $ 1,003,001
Total revenue 1,041,182 1,083,586 1,008,474
Adjusted EBITDA 125,617 120,878 128,988
Depreciation and amortization 18,508 10,603 19,560
Capital expenditures 13,433 11,134 6,240
Total Segments      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 202,285 199,376 183,655
Depreciation and amortization 15,787 9,622 19,099
Capital expenditures 5,753 4,930  
Executive Search Segment      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 206,674 206,156 193,748
Depreciation and amortization 5,411 6,075 16,044
Capital expenditures 4,796 4,070 5,068
On-Demand Talent      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 1,434 (336) 4,592
Depreciation and amortization 8,197 2,669 2,010
Capital expenditures 398 732 0
Heidrick Consulting      
Segment Reporting Information [Line Items]      
Adjusted EBITDA (5,823) (6,444) (14,685)
Depreciation and amortization 2,179 878 1,045
Capital expenditures 559 128 174
Research And Development Segment      
Segment Reporting Information [Line Items]      
Adjusted EBITDA (20,535) (19,965) 0
Depreciation and amortization 2,073 524 0
Capital expenditures 7,170 4,878 0
Global Operations Support      
Segment Reporting Information [Line Items]      
Adjusted EBITDA (56,133) (58,533) (54,667)
Depreciation and amortization 648 457 461
Capital expenditures 510 1,326 998
Service      
Segment Reporting Information [Line Items]      
Revenue before reimbursements (net revenue) 1,026,864 1,073,464 1,003,001
Service | Executive Search Segment      
Segment Reporting Information [Line Items]      
Revenue before reimbursements (net revenue) 780,045 901,922 868,760
Service | On-Demand Talent      
Segment Reporting Information [Line Items]      
Revenue before reimbursements (net revenue) 152,506 91,349 66,636
Service | Heidrick Consulting      
Segment Reporting Information [Line Items]      
Revenue before reimbursements (net revenue) 94,313 80,193 67,605
Reimbursements      
Segment Reporting Information [Line Items]      
Revenue before reimbursements (net revenue) 14,318 10,122 5,473
Americas | Executive Search Segment      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 173,358 164,193 154,087
Depreciation and amortization 3,092 3,498 12,843
Capital expenditures 2,351 1,890 4,487
Americas | Service | Executive Search Segment      
Segment Reporting Information [Line Items]      
Revenue before reimbursements (net revenue) 522,988 612,881 581,440
Europe | Executive Search Segment      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 22,246 22,150 20,219
Depreciation and amortization 1,343 1,451 1,802
Capital expenditures 1,827 683 372
Europe | Service | Executive Search Segment      
Segment Reporting Information [Line Items]      
Revenue before reimbursements (net revenue) 166,379 176,275 170,312
Asia Pacific | Total Segments      
Segment Reporting Information [Line Items]      
Capital expenditures     5,242
Asia Pacific | Executive Search Segment      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 11,070 19,813 19,442
Depreciation and amortization 976 1,126 1,399
Capital expenditures 618 1,497 209
Asia Pacific | Service | Executive Search Segment      
Segment Reporting Information [Line Items]      
Revenue before reimbursements (net revenue) $ 90,678 $ 112,766 $ 117,008