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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]          
Net Revenue $ 639,546 $ 823,137 $ 1,334,438 $ 1,483,244  
Operating Expenses 513,708 656,876 1,048,872 1,182,693  
Operating Income (Loss) 125,838 166,261 285,566 300,551  
Total Assets 6,711,796   6,711,796   $ 7,147,181
Operating Segments [Member] | Financial Advisory Segment [Member]          
Segment Reporting Information [Line Items]          
Net Revenue 407,885 451,940 798,100 770,352  
Operating Expenses 316,574 369,083 614,832 627,130  
Operating Income (Loss) 91,311 82,857 183,268 143,222  
Total Assets 1,199,214   1,199,214   1,239,964
Operating Segments [Member] | Asset Management Segment [Member]          
Segment Reporting Information [Line Items]          
Net Revenue 289,151 365,255 627,652 712,745  
Operating Expenses 232,546 269,314 474,062 501,417  
Operating Income (Loss) 56,605 95,941 153,590 211,328  
Total Assets 910,142   910,142   1,128,549
Corporate [Member]          
Segment Reporting Information [Line Items]          
Net Revenue (57,490) 5,942 (91,314) 147  
Operating Expenses (35,412) 18,479 (40,022) 54,146  
Operating Income (Loss) (22,078) $ (12,537) (51,292) $ (53,999)  
Total Assets $ 4,602,440   $ 4,602,440   $ 4,778,668