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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions | [1] | $ 165,075 | $ 159,054 | $ 499,983 | $ 541,644
Investment banking | [1] | 146,887 | 221,858 | 525,591 | 747,779
Revenue from contracts with customers | [1] | 646,469 | 682,524 | 1,998,521 | 2,267,643
Capital Raising [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Investment banking | [1] | 49,614 | 55,122 | 189,381 | 200,091
Advisory [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Investment banking | [1] | 97,273 | 166,736 | 336,210 | 547,688
Asset Management [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 333,127 | 300,557 | 968,960 | 973,457
Other [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 1,380 | 1,055 | 3,987 | 4,763
Global Wealth Management [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions | [1] | 112,300 | 108,214 | 332,327 | 360,994
Investment banking | [1] | 3,895 | 4,498 | 12,118 | 14,701
Revenue from contracts with customers | [1] | 450,602 | 414,231 | 1,317,129 | 1,353,664
Global Wealth Management [Member] | Capital Raising [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Investment banking | [1] | 3,895 | 4,498 | 12,118 | 14,701
Global Wealth Management [Member] | Asset Management [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 333,088 | 300,540 | 968,863 | 973,396
Global Wealth Management [Member] | Other [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 1,319 | 979 | 3,821 | 4,573
Institutional Group [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Commissions | [1] | 52,775 | 50,840 | 167,656 | 180,650
Investment banking | [1] | 142,992 | 217,360 | 513,473 | 733,078
Revenue from contracts with customers | [1] | 195,823 | 268,217 | 681,243 | 913,789
Institutional Group [Member] | Capital Raising [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Investment banking | [1] | 45,719 | 50,624 | 177,263 | 185,390
Institutional Group [Member] | Advisory [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Investment banking | [1] | 97,273 | 166,736 | 336,210 | 547,688
Institutional Group [Member] | Asset Management [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 39 | 17 | 97 | 61
Institutional Group [Member] | Other [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 17 |  | 17 |
Other [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 44 | 76 | 149 | 190
Other [Member] | Other [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Other | [1] | 44 | 76 | 149 | 190
United States [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 596,433 | 638,020 | 1,816,325 | 2,117,628
United States [Member] | Global Wealth Management [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 450,602 | 414,231 | 1,317,129 | 1,353,664
United States [Member] | Institutional Group [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 145,787 | 223,713 | 499,047 | 763,774
United States [Member] | Other [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 44 | 76 | 149 | 190
United Kingdom [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 31,240 | 29,987 | 99,844 | 101,342
United Kingdom [Member] | Institutional Group [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 31,240 | 29,987 | 99,844 | 101,342
Canada [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 8,601 | 7,920 | 38,738 | 25,043
Canada [Member] | Institutional Group [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 8,601 | 7,920 | 38,738 | 25,043
Other [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | 10,195 | 6,597 | 43,614 | 23,630
Other [Member] | Institutional Group [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue from contracts with customers | [1] | $ 10,195 | $ 6,597 | $ 43,614 | $ 23,630
[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 -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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