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Special Charges - Schedule of Special Charges By Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Special charges	$ 7,103,000	$ 0	$ 0
Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	6,730,000
Operating Segments | Corporate Finance
Restructuring Cost and Reserve [Line Items]
Special charges	861,000
Operating Segments | FLC
Restructuring Cost and Reserve [Line Items]
Special charges	3,484,000
Operating Segments | Economic Consulting
Restructuring Cost and Reserve [Line Items]
Special charges	35,000
Operating Segments | Technology
Restructuring Cost and Reserve [Line Items]
Special charges	276,000
Operating Segments | Strategic Communications
Restructuring Cost and Reserve [Line Items]
Special charges	2,074,000
Unallocated Corporate
Restructuring Cost and Reserve [Line Items]
Special charges	$ 373,000

X

- 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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