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Segment Reporting - Reportable Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Operating revenues |  |  |  |  |
Total revenues | $ 72,570 | $ 57,714 |  | $ 206,249 | $ 167,322
Total operating expenses | (50,862) | (42,490) |  | (156,789) | (123,470)
Other income/(expenses) |  |  |  |  |
Interest expense | (2,747) |  |  | (5,103) |
Settlement gain |  |  |  |  | 6,909
Gain on revaluation of deferred consideration | 7,732 |  | $ 17,630 | 17,630 |
Other gains and losses, net | 118 | (500) |  | (644) | (217)
Income before taxes | 27,530 | 15,496 |  | 63,636 | 52,543
Advisory Fees [Member] |  |  |  |  |
Operating revenues |  |  |  |  |
Total revenues | 71,679 | 57,293 |  | 203,913 | 166,177
U.S. Business segment [Member] |  |  |  |  |
Operating revenues |  |  |  |  |
Other income | 173 | 140 |  | 482 | 371
Total revenues | 50,389 | 54,889 |  | 159,147 | 159,788
Total operating expenses | (33,774) | (36,846) |  | (115,442) | (107,023)
Other income/(expenses) |  |  |  |  |
Interest expense | (196) |  |  | (369) |
Interest income | 719 | 772 |  | 2,293 | 1,999
Settlement gain |  |  |  |  | 6,909
Other gains and losses, net | 318 | (322) |  | 26 | 39
Total other income | 841 | 450 |  | 1,950 | 8,947
Income before taxes | 17,456 | 18,493 |  | 45,655 | 61,712
U.S. Business segment [Member] | Advisory Fees [Member] |  |  |  |  |
Operating revenues |  |  |  |  |
Total revenues | 50,216 | 54,749 |  | 158,665 | 159,417
International Business Segment [Member] |  |  |  |  |
Operating revenues |  |  |  |  |
Other income | 718 | 281 |  | 1,854 | 774
Total revenues | 22,181 | 2,825 |  | 47,102 | 7,534
Total operating expenses | (17,088) | (5,644) |  | (41,347) | (16,447)
Other income/(expenses) |  |  |  |  |
Interest expense | (2,551) |  |  | (4,734) |
Gain on revaluation of deferred consideration | 7,732 |  |  | 17,630 |
Other gains and losses, net | (200) | (178) |  | (670) | (256)
Total other income | 4,981 | (178) |  | 12,226 | (256)
Income before taxes | 10,074 | (2,997) |  | 17,981 | (9,169)
International Business Segment [Member] | Advisory Fees [Member] |  |  |  |  |
Operating revenues |  |  |  |  |
Total revenues | $ 21,463 | $ 2,544 |  | $ 45,248 | $ 6,760

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