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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