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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
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Net Revenue $ 542,436 $ 694,892  
Operating Expenses 579,360 535,164  
Operating Income (Loss) (36,924) 159,728  
Total Assets 4,567,517   $ 5,852,561
Operating Segments [Member] | Financial Advisory Segment [Member]      
Segment Reporting Information [Line Items]      
Net Revenue 277,574 390,215  
Operating Expenses 328,735 298,258  
Operating Income (Loss) (51,161) 91,957  
Total Assets 1,145,663   1,099,921
Operating Segments [Member] | Asset Management Segment [Member]      
Segment Reporting Information [Line Items]      
Net Revenue 284,044 338,501  
Operating Expenses 248,051 241,516  
Operating Income (Loss) 35,993 96,985  
Total Assets 860,230   978,083
Corporate [Member]      
Segment Reporting Information [Line Items]      
Net Revenue (19,182) (33,824)  
Operating Expenses 2,574 (4,610)  
Operating Income (Loss) (21,756) $ (29,214)  
Total Assets $ 2,561,624   $ 3,774,557