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Restructuring - Schedule of Restructuring Charges Reportable Segment (Details) - Employee Related - 2024 Plan $ in Thousands	Mar. 31, 2025 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	$ 6,939
Global Operations Support
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	976
On-Demand Talent | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	286
Heidrick Consulting | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	3,367
Americas | Executive Search | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	1,277
Europe | Executive Search | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	876
Asia Pacific | Executive Search | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	$ 157

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