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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Commissions |  | $ 195,579 | [1] | $ 177,028 | [1] | $ 409,193 | [1] | $ 388,126
Investment banking |  | 376,443 |  | 217,035 |  | 715,731 |  | 396,503
Revenue from contracts with customers |  | 876,248 |  | 605,314 |  | 1,724,179 |  | 1,238,422
Other |  | 8,357 |  | 12,312 |  | 25,239 |  | 17,079
Capital Raising [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Investment banking | [1] | 169,778 |  | 119,197 |  | 378,584 |  | 222,593
Advisory Fees [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Investment banking | [1] | 206,665 |  | 97,838 |  | 337,147 |  | 173,910
Asset Management [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 295,869 |  | 198,939 |  | 574,016 |  | 436,714
Global Wealth Management [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Commissions |  | 139,653 | [1] | 116,156 | [1] | 287,158 | [1] | 253,053
Investment banking |  | 11,898 |  | 8,016 |  | 25,447 |  | 18,349
Revenue from contracts with customers |  | 455,820 |  | 334,661 |  | 909,907 |  | 723,652
Other |  | 8,422 |  | 11,568 |  | 23,346 |  | 15,569
Global Wealth Management [Member] | Capital Raising [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Investment banking | [1] | 11,898 |  | 8,016 |  | 25,447 |  | 18,330
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 |  | 295,847 |  | 198,921 |  | 573,956 |  | 436,681
Institutional Group [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Commissions |  | 55,926 | [1] | 60,875 | [1] | 122,035 | [1] | 135,073
Investment banking |  | 364,545 |  | 209,019 |  | 690,284 |  | 378,154
Revenue from contracts with customers |  | 420,493 |  | 269,912 |  | 812,379 |  | 513,260
Institutional Group [Member] | Capital Raising [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Investment banking | [1] | 157,880 |  | 111,181 |  | 353,137 |  | 204,263
Institutional Group [Member] | Advisory Fees [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Investment banking | [1] | 206,665 |  | 97,838 |  | 337,147 |  | 173,891
Institutional Group [Member] | Asset Management [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 22 |  | 18 |  | 60 |  | 33
Other [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Commissions | [1] |  |  | (3) |  |  |  |
Revenue from contracts with customers |  | (65) |  | 741 |  | 1,893 |  | 1,510
Other |  | (65) |  | 744 |  | 1,893 |  | 1,510
United States [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 800,249 |  | 537,546 |  | 1,560,142 |  | 1,125,349
United States [Member] | Global Wealth Management [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 455,820 |  | 334,661 |  | 909,907 |  | 723,652
United States [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 344,494 |  | 202,144 |  | 648,342 |  | 400,187
United States [Member] | Other [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | (65) |  | 741 |  | 1,893 |  | 1,510
United Kingdom [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 45,824 |  | 48,331 |  | 91,215 |  | 79,094
United Kingdom [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 45,824 |  | 48,331 |  | 91,215 |  | 79,094
Other [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 8,864 |  | 8,553 |  | 21,765 |  | 17,872
Other [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 8,864 |  | 8,553 |  | 21,765 |  | 17,872
Canada [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | 21,311 |  | 10,884 |  | 51,057 |  | 16,107
Canada [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | $ 21,311 |  | $ 10,884 |  | $ 51,057 |  | $ 16,107
[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=68070981&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=120311839&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=120311839&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=120311839&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=120311839&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=120311839&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=121604090&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=120311839&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=120311839&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=120311839&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=121604090&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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