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Goodwill and Other Intangible Assets - Schedule of Goodwill by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 202,252	$ 138,361	$ 138,524	$ 91,643
Executive Search
Goodwill [Line Items]
Goodwill	93,234	92,832
Executive Search | Americas
Goodwill [Line Items]
Goodwill	91,740	91,383	91,463	91,643
Executive Search | Europe
Goodwill [Line Items]
Goodwill	1,494	1,449	1,532	0
On-Demand Talent
Goodwill [Line Items]
Goodwill	$ 109,018	$ 45,529	$ 45,529	$ 0

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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