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Restructuring - Schedule of Restructuring Charges Reportable Segment (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 0	$ 6,939,000	$ 0
Employee Related
Restructuring Cost and Reserve [Line Items]
Restructuring charges			6,939,000
Employee Related | On-Demand Talent
Restructuring Cost and Reserve [Line Items]
Restructuring charges			286,000
Employee Related | Heidrick Consulting
Restructuring Cost and Reserve [Line Items]
Restructuring charges			3,367,000
Employee Related | Global Operations Support
Restructuring Cost and Reserve [Line Items]
Restructuring charges			976,000
Americas | Employee Related | Executive Search
Restructuring Cost and Reserve [Line Items]
Restructuring charges			1,277,000
Europe | Employee Related | Executive Search
Restructuring Cost and Reserve [Line Items]
Restructuring charges			876,000
Asia Pacific | Employee Related | Executive Search
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 157,000

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