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SEGMENT INFORMATION - Schedule of Segment's Contribution with Respect to Net Revenue, Operating Expenses, Operating Income (Loss) and Total Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Net Revenue $ 764,753 $ 542,436  
Operating Expenses 710,192 579,360  
Operating Income (Loss) 54,561 (36,924)  
Total Assets 4,586,970   $ 4,635,781
Operating Segments | Financial Advisory      
Segment Reporting Information [Line Items]      
Net Revenue 453,507 277,574  
Operating Expenses 428,008 328,735  
Operating Income (Loss) 25,499 (51,161)  
Total Assets 1,026,444   1,154,483
Operating Segments | Asset Management      
Segment Reporting Information [Line Items]      
Net Revenue 295,476 284,044  
Operating Expenses 261,680 248,051  
Operating Income (Loss) 33,796 35,993  
Total Assets 1,275,371   1,232,364
Corporate      
Segment Reporting Information [Line Items]      
Net Revenue 15,770 (19,182)  
Operating Expenses 20,504 2,574  
Operating Income (Loss) (4,734) $ (21,756)  
Total Assets $ 2,285,155   $ 2,248,934