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Assets by Segments (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 2,229,018 | $ 2,391,599
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | 2,048,198 | 2,058,144
Operating Segments | Corporate Finance & Restructuring |  |
Segment Reporting Information [Line Items] |  |
Total assets | 671,605 | 668,631
Operating Segments | Forensic and Litigation Consulting |  |
Segment Reporting Information [Line Items] |  |
Total assets | 437,398 | 430,759
Operating Segments | Economic Consulting |  |
Segment Reporting Information [Line Items] |  |
Total assets | 498,765 | 493,694
Operating Segments | Technology |  |
Segment Reporting Information [Line Items] |  |
Total assets | 200,987 | 214,866
Operating Segments | Strategic Communications |  |
Segment Reporting Information [Line Items] |  |
Total assets | 239,443 | 250,194
Unallocated Corporate Assets |  |
Segment Reporting Information [Line Items] |  |
Total assets | $ 180,820 | $ 333,455

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