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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.

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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 Includes (1) underwriting revenue (the spread between the resale price received and the cost of the securities and related expenses) generated through the purchasing, distributing and reselling of new issues of securities (alternatively, could be a secondary offering of a large block of previously issued securities); and (2) fees earned for mergers, acquisitions, divestitures, restructurings, and other types of financial advisory services. + References Reference 1: 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(b),(d)) -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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