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Segment Information - Schedule of Segment Information, Including Significant Segment Expenses (Details) - 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]        
Revenue before reimbursements $ 322,837 $ 278,559 $ 923,663 $ 822,382
Reimbursements 5,059 4,256 13,583 12,408
Total revenue 327,896 282,815 937,246 834,790
Salary and benefits 196,018 166,145 560,396 491,369
General and administrative 30,971 29,912 96,030 96,244
Cost of services 37,644 31,030 102,297 88,158
Adjusted EBITDA 34,244 30,415 97,218 85,094
On-Demand Talent        
Segment Reporting Information [Line Items]        
Revenue before reimbursements     141,340  
Heidrick Consulting        
Segment Reporting Information [Line Items]        
Revenue before reimbursements     91,676  
Americas | Executive Search        
Segment Reporting Information [Line Items]        
Revenue before reimbursements     467,082  
Europe | Executive Search        
Segment Reporting Information [Line Items]        
Revenue before reimbursements     148,769  
Asia Pacific | Executive Search        
Segment Reporting Information [Line Items]        
Revenue before reimbursements     74,796  
Operating Segments        
Segment Reporting Information [Line Items]        
Total segment operating expenses 264,633 227,087 758,723 675,771
Adjusted EBITDA 58,204 51,472 164,940 146,611
Operating Segments | On-Demand Talent        
Segment Reporting Information [Line Items]        
Revenue before reimbursements 50,910 46,231 141,340 125,983
Salary and benefits 12,342 11,751 35,186 34,719
General and administrative 2,506 3,745 10,890 11,564
Cost of services 33,225 28,972 90,999 80,487
Total segment operating expenses 48,073 44,468 137,075 126,770
Adjusted EBITDA 2,837 1,763 4,265 (787)
Operating Segments | Heidrick Consulting        
Segment Reporting Information [Line Items]        
Revenue before reimbursements 32,844 27,939 91,676 80,562
Salary and benefits 24,945 21,317 69,290 60,477
General and administrative 5,344 5,589 14,493 16,861
Cost of services 4,419 2,058 11,298 7,671
Total segment operating expenses 34,708 28,964 95,081 85,009
Adjusted EBITDA (1,864) (1,025) (3,405) (4,447)
Operating Segments | Americas | Executive Search        
Segment Reporting Information [Line Items]        
Revenue before reimbursements 162,508 134,545 467,082 418,302
Salary and benefits 102,085 83,814 292,072 254,673
General and administrative 11,530 10,266 35,240 33,181
Cost of services 0 0 0 0
Total segment operating expenses 113,615 94,080 327,312 287,854
Adjusted EBITDA 48,893 40,465 139,770 130,448
Operating Segments | Europe | Executive Search        
Segment Reporting Information [Line Items]        
Revenue before reimbursements 50,927 43,143 148,769 124,706
Salary and benefits 36,842 31,511 107,919 90,794
General and administrative 7,507 6,610 23,842 22,697
Cost of services 0 0 0 0
Total segment operating expenses 44,349 38,121 131,761 113,491
Adjusted EBITDA 6,578 5,022 17,008 11,215
Operating Segments | Asia Pacific | Executive Search        
Segment Reporting Information [Line Items]        
Revenue before reimbursements 25,648 26,701 74,796 72,829
Salary and benefits 19,804 17,752 55,929 50,706
General and administrative 4,084 3,702 11,565 11,941
Cost of services 0 0 0 0
Total segment operating expenses 23,888 21,454 67,494 62,647
Adjusted EBITDA 1,760 5,247 7,302 10,182
Total reconciling expenses        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 23,960 21,057 67,722 61,517
Total reconciling expenses | On-Demand Talent        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 0 0 0 0
Total reconciling expenses | Heidrick Consulting        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 0 0 0 0
Total reconciling expenses | Americas | Executive Search        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 0 0 0 0
Total reconciling expenses | Europe | Executive Search        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 0 0 0 0
Total reconciling expenses | Asia Pacific | Executive Search        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 0 0 0 0
Research and development        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 4,615 4,606 13,877 14,312
Research and development | On-Demand Talent        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 0 0
Research and development | Heidrick Consulting        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 0 0
Research and development | Americas | Executive Search        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 0 0
Research and development | Europe | Executive Search        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 0 0
Research and development | Asia Pacific | Executive Search        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 0 0
Global Operations Support        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 19,345 16,451 53,845 47,205
Global Operations Support | On-Demand Talent        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 0 0
Global Operations Support | Heidrick Consulting        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 0 0
Global Operations Support | Americas | Executive Search        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 0 0
Global Operations Support | Europe | Executive Search        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 0 0
Global Operations Support | Asia Pacific | Executive Search        
Segment Reporting Information [Line Items]        
Adjusted EBITDA $ 0 $ 0