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Segment Reporting - Reportable Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Operating revenues |  |  |  |
Total revenues | $ 74,775 | $ 56,242 | $ 133,679 | $ 109,609
Total operating expenses | (60,244) | (41,203) | (105,927) | (80,980)
Other income/(expenses) |  |  |  |
Interest expense | (2,356) |  | (2,356) |
Settlement gain |  | 6,909 |  | 6,909
Gain on revaluation of deferred consideration | 9,898 |  | 9,898 |
Other gains and losses, net | (501) | (364) | (762) | 284
Income before taxes | 22,184 | 22,225 | 36,106 | 37,047
Advisory Fees [Member] |  |  |  |
Operating revenues |  |  |  |
Total revenues | 73,778 | 55,856 | 132,234 | 108,884
U.S. Business segment [Member] |  |  |  |
Operating revenues |  |  |  |
Other income | 162 | 128 | 309 | 231
Total revenues | 53,093 | 53,769 | 108,758 | 104,898
Total operating expenses | (42,638) | (35,748) | (81,668) | (70,178)
Other income/(expenses) |  |  |  |
Interest expense | (173) |  | (173) |
Interest income | 612 | 641 | 1,574 | 1,225
Settlement gain |  | 6,909 |  | 6,909
Other gains and losses, net | (66) | (261) | (292) | 364
Total other income/(expenses) | 373 | 7,289 | 1,109 | 8,498
Income before taxes | 10,828 | 25,310 | 28,199 | 43,218
U.S. Business segment [Member] | Advisory Fees [Member] |  |  |  |
Operating revenues |  |  |  |
Total revenues | 52,931 | 53,641 | 108,449 | 104,667
International Business Segment [Member] |  |  |  |
Operating revenues |  |  |  |
Other income | 835 | 258 | 1,136 | 494
Total revenues | 21,682 | 2,473 | 24,921 | 4,711
Total operating expenses | (17,606) | (5,455) | (24,259) | (10,802)
Other income/(expenses) |  |  |  |
Interest expense | (2,183) |  | (2,183) |
Gain on revaluation of deferred consideration | 9,898 |  | 9,898 |
Other gains and losses, net | (435) | (103) | (470) | (80)
Total other income/(expenses) | 7,280 | (103) | 7,245 | (80)
Income before taxes | 11,356 | (3,085) | 7,907 | (6,171)
International Business Segment [Member] | Advisory Fees [Member] |  |  |  |
Operating revenues |  |  |  |
Total revenues | $ 20,847 | $ 2,215 | $ 23,785 | $ 4,217

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