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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