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v3.25.3

Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - 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] |  |  |  |
Depreciation and amortization | $ 5,383 | $ 4,950 | $ 15,245 | $ 13,650
Capital expenditures | 5,501 | 6,504 | 12,141 | 23,042
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 3,506 | 3,745 | 10,112 | 10,592
Capital expenditures | 3,336 | 4,318 | 6,375 | 17,292
Operating Segments | Executive Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 1,383 | 1,407 | 3,910 | 3,547
Capital expenditures | 2,816 | 4,122 | 5,547 | 16,904
Operating Segments | On-Demand Talent |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 1,521 | 1,735 | 4,495 | 5,351
Capital expenditures | 159 | 196 | 339 | 376
Operating Segments | Heidrick Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 602 | 603 | 1,707 | 1,694
Capital expenditures | 361 | 0 | 489 | 12
Operating Segments | Americas | Executive Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 718 | 746 | 1,888 | 2,232
Capital expenditures | 1,873 | 2,647 | 3,473 | 3,679
Operating Segments | Europe | Executive Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 411 | 409 | 1,274 | 746
Capital expenditures | 840 | 768 | 1,874 | 11,512
Operating Segments | Asia Pacific | Executive Search |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 254 | 252 | 748 | 569
Capital expenditures | 103 | 707 | 200 | 1,713
Research and development |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 1,737 | 1,029 | 4,675 | 2,592
Capital expenditures | 2,145 | 2,171 | 5,597 | 5,265
Global Operations Support |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 140 | 176 | 458 | 466
Capital expenditures | $ 20 | $ 15 | $ 169 | $ 485

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