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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Investment Banking [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax $ 362,726 $ 1,249,490
Investment Banking [Member] | Advisory Fees [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax 305,949 1,047,259
Investment Banking [Member] | Underwriting Fees [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax 11,440 62,784
Investment Banking [Member] | Commissions and Related Fees [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax 45,337 139,447
Investment Management [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax 12,678 36,603
Investment Management [Member] | Wealth Management [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax 11,560 33,826
Investment Management [Member] | Institutional Asset Management [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax $ 1,118 $ 2,777