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Financial Instruments and Fair Value - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]
Aggregate cost basis for investments		$ 37,200,000	$ 29,100,000
Earnout accruals		0	36,010,000
Earnout liability		38,601,000	0
Impairment		7,246,000
Heidrick Consulting Reporting Units
Fair Value, Option, Quantitative Disclosures [Line Items]
Impairment	$ 7,200,000	7,200,000
Fair Value, Inputs, Level 3 | Current and Other Current Liabilities | Acqusition Earnout Accruals
Fair Value, Option, Quantitative Disclosures [Line Items]
Earnout accruals		0	36,000,000
Fair Value, Inputs, Level 3 | Non-Current and Other Non-Current Liabilities | Acqusition Earnout Accruals
Fair Value, Option, Quantitative Disclosures [Line Items]
Earnout liability		38,600,000	0
Fair Value, Inputs, Level 3 | Current Accrued Salaries and Benefits | Contingent Compensation
Fair Value, Option, Quantitative Disclosures [Line Items]
Earnout accruals		6,000,000	1,500,000
Fair Value, Inputs, Level 3 | Non-Current Accrued Salaries and Benefits | Contingent Compensation
Fair Value, Option, Quantitative Disclosures [Line Items]
Earnout liability		$ 12,900,000	$ 6,700,000

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