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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, 2023 | Mar. 31, 2022
Disaggregation Of Revenue [Line Items] |  |  |
Commissions | [1] | $ 169,550 | $ 195,909
Investment banking | [1] | 211,879 | 254,846
Revenue from contracts with customers | [1] | 698,225 | 794,566
Capital Raising [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment banking | [1] | 60,816 | 73,450
Advisory [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment banking | [1] | 151,063 | 181,396
Asset Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 315,569 | 341,636
Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 1,227 | 2,175
Global Wealth Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Commissions | [1] | 110,191 | 130,776
Investment banking | [1] | 4,158 | 5,147
Revenue from contracts with customers | [1] | 431,070 | 479,658
Global Wealth Management [Member] | Capital Raising [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment banking | [1] | 4,158 | 5,147
Global Wealth Management [Member] | Asset Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 315,537 | 341,613
Global Wealth Management [Member] | Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 1,184 | 2,122
Institutional Group [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Commissions | [1] | 59,359 | 65,133
Investment banking | [1] | 207,721 | 249,699
Revenue from contracts with customers | [1] | 267,112 | 314,855
Institutional Group [Member] | Capital Raising [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment banking | [1] | 56,658 | 68,303
Institutional Group [Member] | Advisory [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment banking | [1] | 151,063 | 181,396
Institutional Group [Member] | Asset Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 32 | 23
Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 43 | 53
Other [Member] | Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Other | [1] | 43 | 53
United States [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 641,990 | 742,297
United States [Member] | Global Wealth Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 431,070 | 479,658
United States [Member] | Institutional Group [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 210,877 | 262,586
United States [Member] | Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 43 | 53
United Kingdom [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 23,383 | 34,308
United Kingdom [Member] | Institutional Group [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 23,383 | 34,308
Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 10,329 | 8,620
Other [Member] | Institutional Group [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 10,329 | 8,620
Canada [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | 22,523 | 9,341
Canada [Member] | Institutional Group [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers | [1] | $ 22,523 | $ 9,341
[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 https://asc.fasb.org/extlink&oid=126941114&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 https://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 https://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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126920106&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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126920106&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 https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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