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Revenue and Accounts Receivable - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Investment Banking & Equities        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer $ 990,258 $ 691,671 $ 2,445,194 $ 1,877,711
Investment Banking & Equities | Advisory Fees        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer 883,712 592,980 2,138,805 1,591,049
Investment Banking & Equities | Underwriting Fees        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer 43,730 44,132 130,191 130,666
Investment Banking & Equities | Commissions and Related Revenue        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer 62,816 54,559 176,198 155,996
Investment Management        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer 22,477 20,555 64,144 58,454
Investment Management | Wealth Management        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer $ 22,477 $ 20,555 $ 64,144 $ 58,454