Special Charges - Schedule of Special Charges by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]
Special charges	$ 25,295	$ 8,200	$ 0
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Special charges
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
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