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Segment Reporting - Schedule of Assets by Segments (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 2,783,142 | $ 2,379,121
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | 2,238,009 | 2,019,863
Operating Segments | Corporate Finance & Restructuring |  |
Segment Reporting Information [Line Items] |  |
Total assets | 814,820 | 707,924
Operating Segments | Forensic and Litigation Consulting |  |
Segment Reporting Information [Line Items] |  |
Total assets | 462,155 | 412,667
Operating Segments | Economic Consulting |  |
Segment Reporting Information [Line Items] |  |
Total assets | 543,475 | 516,123
Operating Segments | Technology |  |
Segment Reporting Information [Line Items] |  |
Total assets | 200,430 | 171,002
Operating Segments | Strategic Communications |  |
Segment Reporting Information [Line Items] |  |
Total assets | 217,129 | 212,147
Unallocated corporate assets |  |
Segment Reporting Information [Line Items] |  |
Total assets | $ 545,133 | $ 359,258

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