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Revenues from Contracts with Customers (Revenues from Contracts with Customers Disaggregated by Major Business Activity and Primary Geographic Regions) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation Of Revenue [Line Items]    
Commissions [1] $ 213,614 $ 211,098
Investment banking 339,288 179,468
Revenue from contracts with customers 847,931 633,108
Other 16,882 4,767
Capital Raising [Member]    
Disaggregation Of Revenue [Line Items]    
Investment banking 208,806 [1] 103,396
Advisory Fees [Member]    
Disaggregation Of Revenue [Line Items]    
Investment banking 130,482 [1] 76,072
Asset Management [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contracts with customers 278,147 237,775
Global Wealth Management [Member]    
Disaggregation Of Revenue [Line Items]    
Commissions [1] 147,505 136,897
Investment banking 13,549 10,333
Revenue from contracts with customers 454,087 388,991
Other 14,924 4,001
Global Wealth Management [Member] | Capital Raising [Member]    
Disaggregation Of Revenue [Line Items]    
Investment banking 13,549 [1] 10,314
Global Wealth Management [Member] | Advisory Fees [Member]    
Disaggregation Of Revenue [Line Items]    
Investment banking   19
Global Wealth Management [Member] | Asset Management [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contracts with customers 278,109 237,760
Institutional Group [Member]    
Disaggregation Of Revenue [Line Items]    
Commissions [1] 66,109 74,198
Investment banking 325,739 169,135
Revenue from contracts with customers 391,886 243,348
Institutional Group [Member] | Capital Raising [Member]    
Disaggregation Of Revenue [Line Items]    
Investment banking 195,257 [1] 93,082
Institutional Group [Member] | Advisory Fees [Member]    
Disaggregation Of Revenue [Line Items]    
Investment banking 130,482 [1] 76,053
Institutional Group [Member] | Asset Management [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contracts with customers 38 15
Other [Member]    
Disaggregation Of Revenue [Line Items]    
Commissions [1]   3
Revenue from contracts with customers 1,958 769
Other 1,958 766
United States [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contracts with customers 759,893 587,803
United States [Member] | Global Wealth Management [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contracts with customers 454,087 388,991
United States [Member] | Institutional Group [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contracts with customers 303,848 198,043
United States [Member] | Other [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contracts with customers 1,958 769
United Kingdom [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contracts with customers 45,391 30,763
United Kingdom [Member] | Institutional Group [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contracts with customers 45,391 30,763
Other [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contracts with customers 12,901 9,319
Other [Member] | Institutional Group [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contracts with customers 12,901 9,319
Canada [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contracts with customers 29,746 5,223
Canada [Member] | Institutional Group [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contracts with customers $ 29,746 $ 5,223
[1] Excludes revenues not derived from contracts with customers included in the Other segment.