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Acquisitions (Details) - USD ($) $ in Thousands			3 Months Ended				12 Months Ended
	Apr. 01, 2023	Feb. 01, 2023	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Apr. 30, 2023	Feb. 28, 2023	Dec. 31, 2020
Business Acquisition [Line Items]
Payments to acquire businesses, gross							$ 49,858	$ 0	$ 33,518
Goodwill			$ 202,252				202,252	$ 138,361	$ 138,524			$ 91,643
Impairment							7,246
Heidrick Consulting Reporting Units
Business Acquisition [Line Items]
Impairment					$ 7,200		7,200
Atreus
Business Acquisition [Line Items]
Payments to acquire businesses, gross			$ 12,100			$ 33,400
Future consideration, minimum		$ 30,000
Future consideration, maximum		40,000
Goodwill		62,400
Revenue of acquiree since acquisition							70,400
Operating loss of acquiree since acquisition							7,900
Atreus | Acqusition Earnout Accruals | Fair Value, Inputs, Level 3
Business Acquisition [Line Items]
Acquisition earnout accrued		32,000
Atreus | Client relationships
Business Acquisition [Line Items]
Finite-lived intangibles acquired		11,300
Atreus | Software
Business Acquisition [Line Items]
Finite-lived intangibles acquired		5,400
Atreus | Trade name
Business Acquisition [Line Items]
Finite-lived intangibles acquired		$ 2,500									$ 2,500
Businessfourzero
Business Acquisition [Line Items]
Payments to acquire businesses, gross				$ 2,200	$ 9,500
Future consideration, minimum	$ 4,000
Future consideration, maximum	8,000
Goodwill	7,100
Revenue of acquiree since acquisition							11,200
Operating loss of acquiree since acquisition							$ 11,000
Businessfourzero | Acqusition Earnout Accruals | Fair Value, Inputs, Level 3
Business Acquisition [Line Items]
Acquisition earnout accrued	4,300
Businessfourzero | Client relationships
Business Acquisition [Line Items]
Finite-lived intangibles acquired	3,500									$ 3,500
Businessfourzero | Trade name
Business Acquisition [Line Items]
Finite-lived intangibles acquired	$ 500									$ 500

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