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Revenue and Accounts Receivable - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Investment Banking & Equities    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer $ 666,714 $ 533,611
Investment Banking & Equities | Advisory Fees [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer 557,349 429,838
Investment Banking & Equities | Underwriting Fees [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer 54,255 55,535
Investment Banking & Equities | Commissions and Related Revenue [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer 55,110 48,238
Investment Management    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer 20,983 18,699
Investment Management | Wealth Management [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer $ 20,983 $ 18,699