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Restructuring - Schedule of Restructuring Charges by Type of Charge and Reportable Segment (Details) - Employee related - 2024 Plan $ in Thousands | Sep. 30, 2025 USD ($)
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Restructuring Cost and Reserve [Line Items] |
Restructuring and related cost, cost incurred to date | $ 6,939
Operating Segments | On-Demand Talent |
Restructuring Cost and Reserve [Line Items] |
Restructuring and related cost, cost incurred to date | 286
Operating Segments | Heidrick Consulting |
Restructuring Cost and Reserve [Line Items] |
Restructuring and related cost, cost incurred to date | 3,367
Operating Segments | Americas | Executive Search |
Restructuring Cost and Reserve [Line Items] |
Restructuring and related cost, cost incurred to date | 1,277
Operating Segments | Europe | Executive Search |
Restructuring Cost and Reserve [Line Items] |
Restructuring and related cost, cost incurred to date | 876
Operating Segments | Asia Pacific | Executive Search |
Restructuring Cost and Reserve [Line Items] |
Restructuring and related cost, cost incurred to date | 157
Global Operations Support |
Restructuring Cost and Reserve [Line Items] |
Restructuring and related cost, cost incurred to date | $ 976

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