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Special Charges - Schedule of Special Charges By Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]
Special charges	$ 0	$ 8,340	$ 0
Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges		7,564
Unallocated Corporate
Restructuring Cost and Reserve [Line Items]
Special charges		776
Corporate Finance | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges		2,444
FLC | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges		4,614
Economic Consulting | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges		31
Technology | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges		106
Strategic Communications | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges		$ 369

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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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