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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

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