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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, 2025 | Mar. 31, 2024
Disaggregation Of Revenue [Line Items] |  |
Commissions | $ 193,670 | $ 185,476
Investment banking | 237,942 | 213,949
Revenue from contracts with customers | 842,490 | 768,137
Capital Raising [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Investment banking | 100,472 | 94,697
Advisory [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Investment banking | 137,470 | 119,252
Asset Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 409,541 | 367,476
Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,337 | 1,236
Global Wealth Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Commissions | 125,826 | 121,217
Investment banking | 5,908 | 4,280
Revenue from contracts with customers | 542,535 | 494,183
Global Wealth Management [Member] | Capital Raising [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Investment banking | 5,908 | 4,280
Global Wealth Management [Member] | Asset Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 409,506 | 367,450
Global Wealth Management [Member] | Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,295 | 1,236
Institutional Group [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Commissions | 67,844 | 64,259
Investment banking | 232,034 | 209,669
Revenue from contracts with customers | 299,913 | 273,954
Institutional Group [Member] | Capital Raising [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Investment banking | 94,564 | 90,417
Institutional Group [Member] | Advisory [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Investment banking | 137,470 | 119,252
Institutional Group [Member] | Asset Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 35 | 26
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 | 783,079 | 717,633
United States [Member] | Global Wealth Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 542,535 | 494,183
United States [Member] | Institutional Group [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 240,502 | 223,450
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 | 35,564 | 28,185
United Kingdom [Member] | Institutional Group [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 35,564 | 28,185
Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 6,975 | 10,944
Other [Member] | Institutional Group [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 6,975 | 10,944
Canada [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | 16,872 | 11,375
Canada [Member] | Institutional Group [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 16,872 | $ 11,375

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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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