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Special Charges - Schedule of Special Charges by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Restructuring Cost and Reserve [Line Items]
Special charges	$ 25,295	$ 0
Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	23,350
Unallocated Corporate
Restructuring Cost and Reserve [Line Items]
Special charges	1,945
Corporate Finance & Restructuring (“Corporate Finance”) | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	11,696
Forensic and Litigation Consulting (“FLC”) | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	5,475
Economic Consulting | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	983
Technology | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	1,928
Strategic Communications | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	$ 3,268

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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