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Segment Information - Reconciliation of Adjusted EBITDA from Segments to Consolidated (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenue before reimbursements (net revenue) $ 1,098,573 $ 1,026,864 $ 1,073,464
Reimbursements 17,103 14,318 10,122
Total revenue 1,115,676 1,041,182 1,083,586
Salary and benefits 659,007 597,667 699,796
General and administrative 126,457 117,873 103,616
Cost of services 118,950 109,039 70,676
Adjusted EBITDA 111,238 125,617 120,878
Operating Segments      
Segment Reporting Information [Line Items]      
Total operating expenses 904,414 824,579 874,088
Adjusted EBITDA 194,159 202,285 199,376
Research and development      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 19,016 20,535 19,965
Global Operations Support      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 63,905 56,133 58,533
Total reconciling expenses      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 82,921 76,668 78,498
Executive Search | Operating Segments | Americas      
Segment Reporting Information [Line Items]      
Revenue before reimbursements (net revenue) 556,944 522,988 612,881
Salary and benefits 339,294 304,486 405,816
General and administrative 43,390 45,144 42,872
Cost of services 0 0 0
Total operating expenses 382,684 349,630 448,688
Adjusted EBITDA 174,260 173,358 164,193
Executive Search | Operating Segments | Europe      
Segment Reporting Information [Line Items]      
Revenue before reimbursements (net revenue) 165,018 166,379 176,275
Salary and benefits 120,416 116,748 128,240
General and administrative 29,809 27,385 25,885
Cost of services 0 0 0
Total operating expenses 150,225 144,133 154,125
Adjusted EBITDA 14,793 22,246 22,150
Executive Search | Operating Segments | Asia Pacific      
Segment Reporting Information [Line Items]      
Revenue before reimbursements (net revenue) 96,396 90,678 112,766
Salary and benefits 66,816 64,176 76,888
General and administrative 16,253 15,432 16,065
Cost of services 0 0 0
Total operating expenses 83,069 79,608 92,953
Adjusted EBITDA 13,327 11,070 19,813
Executive Search | Research and development | Americas      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 0 0 0
Executive Search | Research and development | Europe      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 0 0 0
Executive Search | Research and development | Asia Pacific      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 0 0 0
Executive Search | Global Operations Support | Americas      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 0 0 0
Executive Search | Global Operations Support | Europe      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 0 0 0
Executive Search | Global Operations Support | Asia Pacific      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 0 0 0
Executive Search | Total reconciling expenses | Americas      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 0 0 0
Executive Search | Total reconciling expenses | Europe      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 0 0 0
Executive Search | Total reconciling expenses | Asia Pacific      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 0 0 0
On-Demand Talent | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue before reimbursements (net revenue) 168,325 152,506 91,349
Salary and benefits 46,739 39,395 22,568
General and administrative 15,083 11,965 5,638
Cost of services 108,487 99,712 63,479
Total operating expenses 170,309 151,072 91,685
Adjusted EBITDA (1,984) 1,434 (336)
On-Demand Talent | Research and development      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 0 0 0
On-Demand Talent | Global Operations Support      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 0 0 0
On-Demand Talent | Total reconciling expenses      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 0 0 0
Heidrick Consulting | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue before reimbursements (net revenue) 111,890 94,313 80,193
Salary and benefits 85,742 72,862 66,284
General and administrative 21,922 17,947 13,156
Cost of services 10,463 9,327 7,197
Total operating expenses 118,127 100,136 86,637
Adjusted EBITDA (6,237) (5,823) (6,444)
Heidrick Consulting | Research and development      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 0 0 0
Heidrick Consulting | Global Operations Support      
Segment Reporting Information [Line Items]      
Adjusted EBITDA 0 0 0
Heidrick Consulting | Total reconciling expenses      
Segment Reporting Information [Line Items]      
Adjusted EBITDA $ 0 $ 0 $ 0