Special Charges - Schedule of Special Charges by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Restructuring Cost and Reserve [Line Items]
Special charges	$ 0	$ 25,295
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 \| 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

- Definition

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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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