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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Commissions |  | $ 189,239 | [1] | $ 172,654 | [1] | $ 598,432 | [1] | $ 560,780
Investment banking |  | 372,279 |  | 218,134 |  | 1,088,010 |  | 614,637
Revenue from contracts with customers |  | 880,472 |  | 636,899 |  | 2,604,651 |  | 1,875,321
Other |  | 5,092 |  | 15,329 |  | 30,331 |  | 32,408
Capital Raising [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Investment banking | [1] | 164,061 |  | 137,292 |  | 542,645 |  | 359,885
Advisory Fees [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Investment banking | [1] | 208,218 |  | 80,842 |  | 545,365 |  | 254,752
Asset Management [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 313,862 |  | 230,782 |  | 887,878 |  | 667,496
Global Wealth Management [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Commissions |  | 133,998 | [1] | 120,600 | [1] | 421,156 | [1] | 373,653
Investment banking |  | 11,580 |  | 8,113 |  | 37,027 |  | 26,462
Revenue from contracts with customers |  | 464,622 |  | 374,013 |  | 1,374,529 |  | 1,097,665
Other |  | 5,206 |  | 14,535 |  | 28,552 |  | 30,104
Global Wealth Management [Member] | Capital Raising [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Investment banking | [1] | 11,580 |  | 8,113 |  | 37,027 |  | 26,443
Global Wealth Management [Member] | Advisory Fees [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Investment banking | [1] |  |  |  |  |  |  | 19
Global Wealth Management [Member] | Asset Management [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 313,838 |  | 230,765 |  | 887,794 |  | 667,446
Institutional Group [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Commissions |  | 55,241 | [1] | 52,054 | [1] | 177,276 | [1] | 187,127
Investment banking |  | 360,699 |  | 210,021 |  | 1,050,983 |  | 588,175
Revenue from contracts with customers |  | 415,964 |  | 262,092 |  | 1,228,343 |  | 775,352
Institutional Group [Member] | Capital Raising [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Investment banking | [1] | 152,481 |  | 129,179 |  | 505,618 |  | 333,442
Institutional Group [Member] | Advisory Fees [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Investment banking | [1] | 208,218 |  | 80,842 |  | 545,365 |  | 254,733
Institutional Group [Member] | Asset Management [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 24 |  | 17 |  | 84 |  | 50
Other [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | (114) |  | 794 |  | 1,779 |  | 2,304
Other |  | (114) |  | 794 |  | 1,779 |  | 2,304
United States [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 812,595 |  | 583,948 |  | 2,372,737 |  | 1,709,297
United States [Member] | Global Wealth Management [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 464,622 |  | 374,013 |  | 1,374,529 |  | 1,097,665
United States [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 348,087 |  | 209,141 |  | 996,429 |  | 609,328
United States [Member] | Other [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | (114) |  | 794 |  | 1,779 |  | 2,304
United Kingdom [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 46,267 |  | 30,959 |  | 137,482 |  | 110,053
United Kingdom [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 46,267 |  | 30,959 |  | 137,482 |  | 110,053
Other [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 8,522 |  | 10,859 |  | 30,287 |  | 28,731
Other [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 8,522 |  | 10,859 |  | 30,287 |  | 28,731
Canada [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 13,088 |  | 11,133 |  | 64,145 |  | 27,240
Canada [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | $ 13,088 |  | $ 11,133 |  | $ 64,145 |  | $ 27,240
[1] | Excludes revenues not derived from contracts with customers included in the Other segment.

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- Definition Amount of commission revenue from buying and selling securities on behalf of customers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 05 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123369997&loc=d3e40544-110947 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(a),(b)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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