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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation Of Revenue [Line Items]        
Commissions [1] $ 159,054 $ 189,239 $ 541,644 $ 598,432
Investment banking [1] 221,858 372,279 747,779 1,088,010
Revenue from contracts with customers [1] 695,034 887,096 2,295,797 2,623,652
Capital Raising [Member]        
Disaggregation Of Revenue [Line Items]        
Investment banking [1] 55,122 164,061 200,091 542,645
Advisory [Member]        
Disaggregation Of Revenue [Line Items]        
Investment banking [1] 166,736 208,218 547,688 545,365
Asset Management [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 300,557 313,862 973,457 887,878
Interest [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 12,510 6,624 28,154 19,001
Other [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 1,055 5,092 4,763 30,331
Global Wealth Management [Member]        
Disaggregation Of Revenue [Line Items]        
Commissions [1] 108,214 133,998 360,994 421,156
Investment banking [1] 4,498 11,580 14,701 37,027
Revenue from contracts with customers [1] 426,550 471,198 1,381,447 1,393,407
Global Wealth Management [Member] | Capital Raising [Member]        
Disaggregation Of Revenue [Line Items]        
Investment banking [1] 4,498 11,580 14,701 37,027
Global Wealth Management [Member] | Advisory [Member]        
Disaggregation Of Revenue [Line Items]        
Investment banking [1] 0 0 0 0
Global Wealth Management [Member] | Asset Management [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 300,540 313,838 973,396 887,794
Global Wealth Management [Member] | Interest [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 12,319 6,576 27,783 18,878
Global Wealth Management [Member] | Other [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 979 5,206 4,573 28,552
Institutional Group [Member]        
Disaggregation Of Revenue [Line Items]        
Commissions [1] 50,840 55,241 180,650 177,276
Investment banking [1] 217,360 360,699 733,078 1,050,983
Revenue from contracts with customers [1] 268,408 416,012 914,160 1,228,466
Institutional Group [Member] | Capital Raising [Member]        
Disaggregation Of Revenue [Line Items]        
Investment banking [1] 50,624 152,481 185,390 505,618
Institutional Group [Member] | Advisory [Member]        
Disaggregation Of Revenue [Line Items]        
Investment banking [1] 166,736 208,218 547,688 545,365
Institutional Group [Member] | Asset Management [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 17 24 61 84
Institutional Group [Member] | Interest [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 191 (48) 371 123
Institutional Group [Member] | Other [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 0 0 0 0
Other [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 76 (114) 190 1,779
Other [Member] | Interest [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 0 0 0 0
Other [Member] | Other [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 76 (114) 190 1,779
United States [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 650,468 811,058 2,145,641 2,459,543
United States [Member] | Global Wealth Management [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 426,550 471,198 1,381,447 1,393,407
United States [Member] | Institutional Group [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 223,842 339,974 764,004 1,064,357
United States [Member] | Other [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 76 (114) 190 1,779
United Kingdom [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 29,987 45,824 101,342 91,215
United Kingdom [Member] | Institutional Group [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 29,987 45,824 101,342 91,215
Canada [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 7,982 21,350 25,184 51,129
Canada [Member] | Institutional Group [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 7,982 21,350 25,184 51,129
Other [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] 6,597 8,864 23,630 21,765
Other [Member] | Institutional Group [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers [1] $ 6,597 $ 8,864 $ 23,630 $ 21,765
[1] Excludes revenues not derived from contracts with customers included in the Other segment.