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Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 137,861
Foreign currency translation	1,586
Goodwill, ending balance	139,447
Goodwill, gross	206,171	$ 204,585
Accumulated impairment losses	(66,724)	(66,724)
Executive Search
Goodwill [Roll Forward]
Goodwill, gross	92,440	92,203
On-Demand Talent
Goodwill [Roll Forward]
Goodwill, beginning balance	47,121
Foreign currency translation	1,349
Goodwill, ending balance	48,470
Goodwill, gross	106,485	105,136
Accumulated impairment losses	(58,015)	(58,015)
Heidrick Consulting
Goodwill [Roll Forward]
Goodwill, beginning balance	0
Foreign currency translation	0
Goodwill, ending balance	0
Goodwill, gross	7,246	7,246
Accumulated impairment losses	(7,246)	(7,246)
Americas | Executive Search
Goodwill [Roll Forward]
Goodwill, beginning balance	90,740
Foreign currency translation	237
Goodwill, ending balance	90,977
Goodwill, gross	90,977	90,740
Accumulated impairment losses	0	0
Europe | Executive Search
Goodwill [Roll Forward]
Goodwill, beginning balance	0
Foreign currency translation	0
Goodwill, ending balance	0
Goodwill, gross	1,463	1,463
Accumulated impairment losses	$ (1,463)	$ (1,463)

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