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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Commissions |  | $ 177,028 | [1] | $ 164,981 | $ 388,126 | $ 320,430
Investment banking |  | 217,035 |  | 179,617 | 396,503 | 341,457
Revenue from contracts with customers |  | 605,314 |  | 559,517 | 1,238,422 | 1,075,855
Other |  | 12,312 |  | 3,748 | 17,079 | 7,530
Capital Raising [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Investment banking | [1] | 119,197 |  | 96,712 | 222,593 | 153,657
Advisory Fees [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Investment banking | [1] | 97,838 |  | 82,905 | 173,910 | 187,800
Asset Management [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Revenue from contracts with customers |  | 198,939 |  | 211,171 | 436,714 | 406,438
Global Wealth Management [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Commissions |  | 116,156 | [1] | 120,284 | 253,053 | 230,211
Investment banking |  | 8,016 |  | 10,559 | 18,349 | 18,782
Revenue from contracts with customers |  | 334,661 |  | 345,548 | 723,652 | 661,406
Other |  | 11,568 |  | 3,549 | 15,569 | 6,004
Global Wealth Management [Member] | Capital Raising [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Investment banking | [1] | 8,016 |  | 10,559 | 18,330 | 18,782
Global Wealth Management [Member] | Advisory Fees [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Investment banking | [1] |  |  |  | 19 |
Global Wealth Management [Member] | Asset Management [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Revenue from contracts with customers |  | 198,921 |  | 211,156 | 436,681 | 406,409
Institutional Group [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Commissions |  | 60,875 | [1] | 44,697 | 135,073 | 90,219
Investment banking |  | 209,019 |  | 169,058 | 378,154 | 322,675
Revenue from contracts with customers |  | 269,912 |  | 213,770 | 513,260 | 412,923
Institutional Group [Member] | Capital Raising [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Investment banking | [1] | 111,181 |  | 86,153 | 204,263 | 134,875
Institutional Group [Member] | Advisory Fees [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Investment banking | [1] | 97,838 |  | 82,905 | 173,891 | 187,800
Institutional Group [Member] | Asset Management [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Revenue from contracts with customers |  | 18 |  | 15 | 33 | 29
Other [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Commissions | [1] | (3) |  |  |  |
Revenue from contracts with customers |  | 741 |  | 199 | 1,510 | 1,526
Other |  | 744 |  | 199 | 1,510 | 1,526
United States [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Revenue from contracts with customers |  | 537,546 |  | 518,705 | 1,125,349 | 1,012,630
United States [Member] | Global Wealth Management [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Revenue from contracts with customers |  | 334,661 |  | 345,548 | 723,652 | 661,406
United States [Member] | Institutional Group [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Revenue from contracts with customers |  | 202,144 |  | 172,958 | 400,187 | 349,698
United States [Member] | Other [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Revenue from contracts with customers |  | 741 |  | 199 | 1,510 | 1,526
United Kingdom [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Revenue from contracts with customers |  | 48,331 |  | 39,668 | 79,094 | 60,771
United Kingdom [Member] | Institutional Group [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Revenue from contracts with customers |  | 48,331 |  | 39,668 | 79,094 | 60,771
Other [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Revenue from contracts with customers |  | 19,437 |  | 1,144 | 33,979 | 2,454
Other [Member] | Institutional Group [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Revenue from contracts with customers |  | $ 19,437 |  | $ 1,144 | $ 33,979 | $ 2,454
[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 -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 05 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=68070981&loc=d3e40544-110947 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(a),(b)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(b),(d)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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