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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, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation Of Revenue [Line Items] |  |  |  |
Commissions | $ 200,669 | $ 183,317 | $ 394,339 | $ 368,793
Investment banking | 233,460 | 233,281 | 471,402 | 447,230
Revenue from contracts with customers | 838,918 | 798,917 | 1,681,408 | 1,567,054
Capital Raising [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment banking | 106,155 | 101,870 | 206,627 | 196,567
Advisory [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment banking | 127,305 | 131,411 | 264,775 | 250,663
Asset Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 403,608 | 380,757 | 813,149 | 748,233
Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,181 | 1,562 | 2,518 | 2,798
Global Wealth Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Commissions | 128,203 | 121,465 | 254,029 | 242,682
Investment banking | 6,224 | 5,780 | 12,132 | 10,060
Revenue from contracts with customers | 539,182 | 509,544 | 1,081,717 | 1,003,727
Global Wealth Management [Member] | Capital Raising [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment banking | 6,224 | 5,780 | 12,132 | 10,060
Global Wealth Management [Member] | Asset Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 403,574 | 380,737 | 813,080 | 748,187
Global Wealth Management [Member] | Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,181 | 1,562 | 2,476 | 2,798
Institutional Group [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Commissions | 72,466 | 61,852 | 140,310 | 126,111
Investment banking | 227,236 | 227,501 | 459,270 | 437,170
Revenue from contracts with customers | 299,736 | 289,373 | 599,649 | 563,327
Institutional Group [Member] | Capital Raising [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment banking | 99,931 | 96,090 | 194,495 | 186,507
Institutional Group [Member] | Advisory [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment banking | 127,305 | 131,411 | 264,775 | 250,663
Institutional Group [Member] | Asset Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 34 | 20 | 69 | 46
Institutional Group [Member] | Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  |  | 42 |
Other [Member] | Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  |  | 42 |
United States [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 787,818 | 743,642 | 1,570,897 | 1,461,275
United States [Member] | Global Wealth Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 539,182 | 509,544 | 1,081,717 | 1,003,727
United States [Member] | Institutional Group [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 248,636 | 234,098 | 489,138 | 457,548
United States [Member] | Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  |  | 42 |
United Kingdom [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 32,317 | 33,386 | 67,881 | 61,571
United Kingdom [Member] | Institutional Group [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 32,317 | 33,386 | 67,881 | 61,571
Canada [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 9,786 | 9,712 | 26,658 | 21,087
Canada [Member] | Global Wealth Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 |  |
Canada [Member] | Institutional Group [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 9,786 | 9,712 | 26,658 | 21,087
Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 8,997 | 12,177 | 15,972 | 23,121
Other [Member] | Institutional Group [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 8,997 | $ 12,177 | $ 15,972 | $ 23,121

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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/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-4 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-14 Reference 3: 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 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 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-7 Reference 6: 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 7: 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 8: 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 9: 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 10: 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 11: 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 12: 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 13: 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 14: 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 15: 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 16: 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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