Special Charges - Schedule of Special Charges by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Restructuring Cost and Reserve [Line Items]
Total	$ 46,008	$ 0	$ 46,008	$ 25,295
Operating Segments
Restructuring Cost and Reserve [Line Items]
Total	41,542	0	41,542	23,350
Unallocated Corporate
Restructuring Cost and Reserve [Line Items]
Total	4,466	0	4,466	1,945
Corporate Finance \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Total	16,001	0	16,001	11,696
Forensic and Litigation Consulting (“FLC”) \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Total	15,707	0	15,707	5,475
Economic Consulting \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Total	1,647	0	1,647	983
Technology \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Total	2,883	0	2,883	1,928
Strategic Communications \| Operating Segments
Restructuring Cost and Reserve [Line Items]
Total	$ 5,304	$ 0	$ 5,304	$ 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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