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Segment Reporting - Reportable Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Revenues |  |  |  |
Advisory fees | $ 57,574 | $ 51,553 | $ 166,950 | $ 168,099
Settlement gain |  |  | 6,909 |
Other income | 412 | 236 | 2,154 | 549
Total revenues | 57,986 | 51,789 | 176,013 | 168,648
Income/(loss) before taxes |  |  |  |
Total income before taxes | 15,496 | 14,225 | 52,543 | 47,053
U.S. Business segment [Member] |  |  |  |
Revenues |  |  |  |
Advisory fees | 54,749 | 49,568 | 159,416 | 162,721
Settlement gain |  |  | 6,909 |
Other income | 590 | 323 | 2,410 | 931
Total revenues | 55,339 | 49,891 | 168,735 | 163,652
Income/(loss) before taxes |  |  |  |
Total income before taxes | 18,493 | 17,032 | 61,712 | 61,326
International Business Segment [Member] |  |  |  |
Revenues |  |  |  |
Advisory fees | 2,825 | 1,985 | 7,534 | 5,378
Other loss | (178) | (87) | (256) | (382)
Total revenues | 2,647 | 1,898 | 7,278 | 4,996
Income/(loss) before taxes |  |  |  |
Total income before taxes | $ (2,997) | $ (2,807) | $ (9,169) | $ (14,273)

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