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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 ($)
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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+ References

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
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