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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, 2022 | Mar. 31, 2021
Disaggregation Of Revenue [Line Items] |  |  |
Commissions | [1] | $ 195,909 | $ 213,614
Investment banking | [1] | 254,846 | 339,288
Revenue from contracts with customers | [1] | 801,478 | 854,022
Capital Raising [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment banking | [1] | 73,450 | 208,806
Advisory [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment banking | [1] | 181,396 | 130,482
Asset Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 341,636 | 278,147
Interest [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 6,912 | 6,091
Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 2,175 | 16,882
Global Wealth Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Commissions | [1] | 130,776 | 147,505
Investment banking | [1] | 5,147 | 13,549
Revenue from contracts with customers | [1] | 486,522 | 460,143
Global Wealth Management [Member] | Capital Raising [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment banking | [1] | 5,147 | 13,549
Global Wealth Management [Member] | Advisory [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment banking | [1] | 0 |
Global Wealth Management [Member] | Asset Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 341,613 | 278,109
Global Wealth Management [Member] | Interest [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 6,864 | 6,056
Global Wealth Management [Member] | Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 2,122 | 14,924
Institutional Group [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Commissions | [1] | 65,133 | 66,109
Investment banking | [1] | 249,699 | 325,739
Revenue from contracts with customers | [1] | 314,903 | 391,921
Institutional Group [Member] | Capital Raising [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment banking | [1] | 68,303 | 195,257
Institutional Group [Member] | Advisory [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment banking | [1] | 181,396 | 130,482
Institutional Group [Member] | Asset Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 23 | 38
Institutional Group [Member] | Interest [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 48 | 35
Institutional Group [Member] | Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 0 |
Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 53 | 1,958
Other [Member] | Interest [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 0 | 0
Other [Member] | Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 53 |
Other | [1] |  | 1,958
United States [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 749,172 | 765,951
United States [Member] | Global Wealth Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 486,522 | 460,143
United States [Member] | Institutional Group [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 262,597 | 303,850
United States [Member] | Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 53 | 1,958
United Kingdom [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 34,308 | 45,391
United Kingdom [Member] | Institutional Group [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 34,308 | 45,391
Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 8,620 | 12,901
Other [Member] | Institutional Group [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 8,620 | 12,901
Canada [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 9,378 | 29,779
Canada [Member] | Institutional Group [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | $ 9,378 | $ 29,779
[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 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=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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