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Goodwill and Other Intangible Assets - Schedule of Goodwill by Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Goodwill [Line Items]
Goodwill, gross	$ 206,620	$ 209,498
Accumulated impairment losses	(23,470)	(7,246)
Goodwill	183,150	202,252
Executive Search
Goodwill [Line Items]
Goodwill, gross	92,654	93,234
Executive Search | Americas
Goodwill [Line Items]
Goodwill, gross	91,191	91,740
Accumulated impairment losses	0	0
Goodwill	91,191	91,740
Executive Search | Europe
Goodwill [Line Items]
Goodwill, gross	1,463	1,494
Accumulated impairment losses	(1,463)	0
Goodwill	0	1,494
On-Demand Talent
Goodwill [Line Items]
Goodwill, gross	106,720	109,018
Accumulated impairment losses	(14,761)	0
Goodwill	91,959	109,018
Heidrick Consulting
Goodwill [Line Items]
Goodwill, gross	7,246	7,246
Accumulated impairment losses	(7,246)	(7,246)
Goodwill	$ 0	$ 0

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