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Segment Reporting - Schedule of Assets by Segments (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 2,257,241 | $ 2,225,368
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | 2,040,034 | 1,982,587
Operating Segments | Corporate Finance & Restructuring |  |
Segment Reporting Information [Line Items] |  |
Total assets | 726,176 | 681,919
Operating Segments | Forensic and Litigation Consulting |  |
Segment Reporting Information [Line Items] |  |
Total assets | 401,905 | 400,047
Operating Segments | Economic Consulting |  |
Segment Reporting Information [Line Items] |  |
Total assets | 501,471 | 496,757
Operating Segments | Technology |  |
Segment Reporting Information [Line Items] |  |
Total assets | 195,399 | 189,704
Operating Segments | Strategic Communications |  |
Segment Reporting Information [Line Items] |  |
Total assets | 215,083 | 214,160
Unallocated Corporate assets |  |
Segment Reporting Information [Line Items] |  |
Total assets | $ 217,207 | $ 242,781

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