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Goodwill and Other Intangible Assets - Schedule of Goodwill by Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Goodwill [Line Items]
Goodwill, gross	$ 209,359	$ 204,585
Accumulated impairment	(66,724)	(66,724)
Total goodwill	142,635	137,861
Executive Search
Goodwill [Line Items]
Goodwill, gross	92,809	92,203
On-Demand Talent
Goodwill [Line Items]
Goodwill, gross	109,304	105,136
Accumulated impairment	(58,015)	(58,015)
Total goodwill	51,289	47,121
Heidrick Consulting
Goodwill [Line Items]
Goodwill, gross	7,246	7,246
Accumulated impairment	(7,246)	(7,246)
Total goodwill	0	0
Americas | Executive Search
Goodwill [Line Items]
Goodwill, gross	91,346	90,740
Accumulated impairment	0	0
Total goodwill	91,346	90,740
Europe | Executive Search
Goodwill [Line Items]
Goodwill, gross	1,463	1,463
Accumulated impairment	(1,463)	(1,463)
Total goodwill	$ 0	$ 0

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