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Segment Information - Segment's Contribution with Respect to Net Revenue, Operating Expenses, Operating Income (Loss) and Total Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Net Revenue $ 2,515,489 $ 2,773,571 $ 3,193,048
Operating Expenses 2,595,446 2,256,723 2,469,200
Operating Income (Loss) (79,957) 516,848 723,848
Depreciation and amortization of property 42,853 42,336 38,315
Total Assets 4,635,781 5,852,561  
Operating Segments | Financial Advisory      
Segment Reporting Information [Line Items]      
Net Revenue 1,385,357 1,666,156 1,764,509
Operating Expenses 1,489,862 1,304,715 1,356,567
Operating Income (Loss) (104,505) 361,441 407,942
Depreciation and amortization of property 8,517 8,968 8,480
Total Assets 1,154,483 1,099,921  
Operating Segments | Asset Management      
Segment Reporting Information [Line Items]      
Net Revenue 1,151,496 1,204,927 1,424,985
Operating Expenses 1,011,574 963,640 1,032,825
Operating Income (Loss) 139,922 241,287 392,160
Depreciation and amortization of property 6,476 9,390 5,618
Total Assets 1,232,364 1,786,830  
Corporate      
Segment Reporting Information [Line Items]      
Net Revenue (21,364) (97,512) 3,554
Operating Expenses 94,010 (11,632) 79,808
Operating Income (Loss) (115,374) (85,880) (76,254)
Depreciation and amortization of property 27,860 23,978 $ 24,217
Total Assets $ 2,248,934 $ 2,965,810