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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, 2024	Dec. 31, 2023	Dec. 31, 2022	Apr. 30, 2023	Feb. 28, 2023	Dec. 31, 2021
Business Acquisition [Line Items]
Payments to acquire businesses, gross							$ 0	$ 49,858	$ 0
Goodwill			$ 202,252				137,861	202,252	138,361			$ 138,524
Goodwill, impairment loss							$ 59,478	7,246	$ 0
Heidrick Consulting Reporting Units
Business Acquisition [Line Items]
Goodwill, impairment loss								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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