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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Investment Banking [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer $ 809,477 $ 381,164 $ 2,113,765 $ 1,300,747
Investment Banking [Member] | Advisory Fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer 708,333 270,662 1,781,065 965,662
Investment Banking [Member] | Underwriting Fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer 54,381 66,499 181,686 181,182
Investment Banking [Member] | Commissions and Related Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer 46,763 44,003 151,014 153,903
Investment Management [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer 16,960 14,025 48,092 39,725
Investment Management [Member] | Wealth Management [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer 16,960 13,664 48,092 38,624
Investment Management [Member] | Institutional Asset Management [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer $ 0 $ 361 $ 0 $ 1,101