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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 | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disaggregation Of Revenue [Line Items] |  |
Commissions | $ 673,597 | $ 710,589
Investment banking | 731,255 | 971,485
Revenue from contracts with customers | 2,709,629 | 2,950,827
Capital Raising [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Investment banking | 265,667 | 256,862
Advisory [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Investment banking | 465,588 | 714,623
Asset Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,299,496 | 1,262,919
Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 5,281 | 5,834
Global Wealth Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Commissions | 444,949 | 473,638
Investment banking | 16,680 | 19,515
Revenue from contracts with customers | 1,766,069 | 1,761,563
Global Wealth Management [Member] | Capital Raising [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Investment banking | 16,680 | 19,515
Global Wealth Management [Member] | Asset Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,299,361 | 1,262,841
Global Wealth Management [Member] | Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 5,079 | 5,569
Institutional Group [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Commissions | 228,648 | 236,951
Investment banking | 714,575 | 951,970
Revenue from contracts with customers | 943,375 | 1,188,999
Institutional Group [Member] | Capital Raising [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Investment banking | 248,987 | 237,347
Institutional Group [Member] | Advisory [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Investment banking | 465,588 | 714,623
Institutional Group [Member] | Asset Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 135 | 78
Institutional Group [Member] | Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 17 |
Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 185 | 265
Other [Member] | Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers |  | 265
Other | 185 |
United States [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 2,507,537 | 2,732,788
United States [Member] | Global Wealth Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,766,069 | 1,761,563
United States [Member] | Institutional Group [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 741,283 | 970,960
United States [Member] | Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 185 | 265
United Kingdom [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 107,631 | 148,690
United Kingdom [Member] | Institutional Group [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 107,631 | 148,690
Canada [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 42,263 | 33,718
Canada [Member] | Institutional Group [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 42,263 | 33,718
Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 52,198 | 35,631
Other [Member] | Institutional Group [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 52,198 | $ 35,631

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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 -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 05 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481996/940-20-05-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(a),(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + 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 -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(b),(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + 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 -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-4 + Details
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