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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation Of Revenue [Line Items]        
Commissions $ 163,920 $ 158,015 $ 484,350 $ 490,692
Investment banking 198,790 168,992 540,247 506,437
Revenue from contracts with customers 585,587 532,144 1,661,442 1,605,149
Other 5,249 4,394 12,779 11,908
Capital Raising [Member]        
Disaggregation Of Revenue [Line Items]        
Investment banking [1] 93,943 93,275 247,599 246,044
Advisory Fees [Member]        
Disaggregation Of Revenue [Line Items]        
Investment banking [1] 104,847 75,717 292,648 260,393
Asset Management [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers 217,628 200,743 624,066 596,112
Global Wealth Management [Member]        
Disaggregation Of Revenue [Line Items]        
Commissions 118,061 117,795 348,272 355,129
Investment banking 9,855 7,722 28,637 23,459
Revenue from contracts with customers 350,147 329,628 1,011,553 983,638
Other 4,615 3,376 10,619 8,969
Global Wealth Management [Member] | Capital Raising [Member]        
Disaggregation Of Revenue [Line Items]        
Investment banking [1] 9,855 7,722 28,637 23,378
Global Wealth Management [Member] | Advisory Fees [Member]        
Disaggregation Of Revenue [Line Items]        
Investment banking [1]       81
Global Wealth Management [Member] | Asset Management [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers 217,616 200,735 624,025 596,081
Institutional Group [Member]        
Disaggregation Of Revenue [Line Items]        
Commissions 45,859 40,220 136,078 135,563
Investment banking 188,935 161,270 511,610 482,978
Revenue from contracts with customers 234,806 201,498 647,729 618,572
Institutional Group [Member] | Capital Raising [Member]        
Disaggregation Of Revenue [Line Items]        
Investment banking [1] 84,088 85,553 218,962 222,666
Institutional Group [Member] | Advisory Fees [Member]        
Disaggregation Of Revenue [Line Items]        
Investment banking [1] 104,847 75,717 292,648 260,312
Institutional Group [Member] | Asset Management [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers 12 8 41 31
Other [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers 634 1,018 2,160 2,939
Other 634 1,018 2,160 2,939
United States [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers 546,001 503,028 1,558,631 1,508,724
United States [Member] | Global Wealth Management [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers 350,147 329,628 1,011,553 983,638
United States [Member] | Institutional Group [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers 195,220 172,382 544,918 522,147
United States [Member] | Other [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers 634 1,018 2,160 2,939
United Kingdom [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers 38,249 28,197 99,020 92,029
United Kingdom [Member] | Institutional Group [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers 38,249 28,197 99,020 92,029
Other [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers 1,337 919 3,791 4,396
Other [Member] | Institutional Group [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers $ 1,337 $ 919 $ 3,791 $ 4,396
[1] Excludes revenues not derived from contracts with customers included in the Other segment.