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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation Of Revenue [Line Items] |  |  |  |
Commissions | $ 183,317 | $ 165,358 | $ 368,793 | $ 334,908
Investment banking | 233,281 | 166,825 | 447,230 | 378,704
Revenue from contracts with customers | 798,917 | 653,827 | 1,567,054 | 1,352,052
Capital Raising [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment banking | 101,870 | 78,951 | 196,567 | 139,767
Advisory [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment banking | 131,411 | 87,874 | 250,663 | 238,937
Asset Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 380,757 | 320,264 | 748,233 | 635,833
Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,562 | 1,380 | 2,798 | 2,607
Global Wealth Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Commissions | 121,465 | 109,836 | 242,682 | 220,027
Investment banking | 5,780 | 4,065 | 10,060 | 8,223
Revenue from contracts with customers | 509,544 | 435,457 | 1,003,727 | 866,527
Global Wealth Management [Member] | Capital Raising [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment banking | 5,780 | 4,065 | 10,060 | 8,223
Global Wealth Management [Member] | Asset Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 380,737 | 320,238 | 748,187 | 635,775
Global Wealth Management [Member] | Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,562 | 1,318 | 2,798 | 2,502
Institutional Group [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Commissions | 61,852 | 55,522 | 126,111 | 114,881
Investment banking | 227,501 | 162,760 | 437,170 | 370,481
Revenue from contracts with customers | 289,373 | 218,308 | 563,327 | 485,420
Institutional Group [Member] | Capital Raising [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment banking | 96,090 | 74,886 | 186,507 | 131,544
Institutional Group [Member] | Advisory [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment banking | 131,411 | 87,874 | 250,663 | 238,937
Institutional Group [Member] | Asset Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 20 | 26 | 46 | 58
Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 62 |  | 105
Other [Member] | Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Other |  | 62 |  | 105
United States [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 743,642 | 577,902 | 1,461,275 | 1,219,892
United States [Member] | Global Wealth Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 509,544 | 435,457 | 1,003,727 | 866,527
United States [Member] | Institutional Group [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 234,098 | 142,383 | 457,548 | 353,260
United States [Member] | Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 62 |  | 105
United Kingdom [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 33,386 | 45,221 | 61,571 | 68,604
United Kingdom [Member] | Institutional Group [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 33,386 | 45,221 | 61,571 | 68,604
Canada [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 9,712 | 7,614 | 21,087 | 30,137
Canada [Member] | Institutional Group [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 9,712 | 7,614 | 21,087 | 30,137
Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 12,177 | 23,090 | 23,121 | 33,419
Other [Member] | Institutional Group [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 12,177 | $ 23,090 | $ 23,121 | $ 33,419

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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 -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 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)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-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)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 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)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-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 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 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -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 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -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 6: 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 7: 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 8: 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 9: 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 10: 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 11: 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 12: 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 13: 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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