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Segment Information - Schedule of Segment Information, Including Significant Segment Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Revenue before reimbursements $ 317,248 $ 278,626 $ 600,826 $ 543,823
Reimbursements 4,660 4,251 8,524 8,152
Total revenue 321,908 282,877 609,350 551,975
Salary and benefits 192,246 164,275 364,878 325,224
General and administrative 34,275 34,987 64,559 66,332
Cost of services 34,594 29,696 64,653 57,128
Adjusted EBITDA 33,852 28,811 62,974 54,679
Operating Segments        
Segment Reporting Information [Line Items]        
Total segment operating expenses 261,115 228,958 494,090 448,684
Adjusted EBITDA 56,133 49,668 106,736 95,139
Operating Segments | On-Demand Talent        
Segment Reporting Information [Line Items]        
Revenue before reimbursements 47,866 41,895 90,430 79,752
Salary and benefits 11,246 11,375 22,844 22,968
General and administrative 4,643 4,724 8,384 7,819
Cost of services 30,949 27,425 57,774 51,515
Total segment operating expenses 46,838 43,524 89,002 82,302
Adjusted EBITDA 1,028 (1,629) 1,428 (2,550)
Operating Segments | Heidrick Consulting        
Segment Reporting Information [Line Items]        
Revenue before reimbursements 31,208 26,764 58,832 52,623
Salary and benefits 22,710 20,276 44,345 39,160
General and administrative 4,298 5,612 9,149 11,272
Cost of services 3,645 2,271 6,879 5,613
Total segment operating expenses 30,653 28,159 60,373 56,045
Adjusted EBITDA 555 (1,395) (1,541) (3,422)
Operating Segments | Americas | Executive Search        
Segment Reporting Information [Line Items]        
Revenue before reimbursements 160,170 147,078 304,574 283,757
Salary and benefits 100,394 86,833 190,487 170,859
General and administrative 13,121 12,133 23,210 22,915
Cost of services 0 0 0 0
Total segment operating expenses 113,515 98,966 213,697 193,774
Adjusted EBITDA 46,655 48,112 90,877 89,983
Operating Segments | Europe | Executive Search        
Segment Reporting Information [Line Items]        
Revenue before reimbursements 52,451 40,082 97,842 81,563
Salary and benefits 38,588 29,029 71,077 59,283
General and administrative 8,475 8,213 16,335 16,087
Cost of services 0 0 0 0
Total segment operating expenses 47,063 37,242 87,412 75,370
Adjusted EBITDA 5,388 2,840 10,430 6,193
Operating Segments | Asia Pacific | Executive Search        
Segment Reporting Information [Line Items]        
Revenue before reimbursements 25,553 22,807 49,148 46,128
Salary and benefits 19,308 16,762 36,125 32,954
General and administrative 3,738 4,305 7,481 8,239
Cost of services 0 0 0 0
Total segment operating expenses 23,046 21,067 43,606 41,193
Adjusted EBITDA 2,507 1,740 5,542 4,935
Total reconciling expenses        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 22,281 20,857 43,762 40,460
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 4,638 4,781 9,262 9,706
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 17,643 16,076 34,500 30,754
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