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Segment Information - Segment's Contribution with Respect to Net Revenue, Operating Expenses, Operating Income (Loss) and Total Assets (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]          
Net Revenue $ 757,938 $ 717,180 $ 1,512,636 $ 1,340,644  
Operating Expenses 557,998 544,679 1,126,868 1,017,946  
Operating Income (Loss) 199,940 172,501 385,768 322,698  
Total Assets 4,627,992   4,627,992   $ 4,928,677
Operating Segments [Member] | Financial Advisory Segment [Member]          
Segment Reporting Information [Line Items]          
Net Revenue 422,089 410,882 831,210 746,694  
Operating Expenses 318,177 313,719 642,873 576,470  
Operating Income (Loss) 103,912 97,163 188,337 170,224  
Total Assets 877,678   877,678   843,142
Operating Segments [Member] | Asset Management Segment [Member]          
Segment Reporting Information [Line Items]          
Net Revenue 352,588 309,878 706,871 593,241  
Operating Expenses 229,561 215,901 459,230 404,652  
Operating Income (Loss) 123,027 93,977 247,641 188,589  
Total Assets 709,833   709,833   756,398
Corporate [Member]          
Segment Reporting Information [Line Items]          
Net Revenue (16,739) (3,580) (25,445) 709  
Operating Expenses 10,260 15,059 24,765 36,824  
Operating Income (Loss) (26,999) $ (18,639) (50,210) $ (36,115)  
Total Assets $ 3,040,481   $ 3,040,481   $ 3,329,137