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Special Charges - Schedule of Special Charges By Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges | $ 0 | $ 40,885 | $ 10,445
Operating Segments |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges |  | 37,207 | 9,833
Operating Segments | Corporate Finance & Restructuring |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges |  | 5,440 | 0
Operating Segments | Forensic and Litigation Consulting |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges |  | 12,334 | 2,304
Operating Segments | Economic Consulting |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges |  | 6,624 | 0
Operating Segments | Technology |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges |  | 5,057 | 7,529
Operating Segments | Strategic Communications |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges |  | 7,752 | 0
Unallocated Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges |  | $ 3,678 | $ 612

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