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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, 2019 | Mar. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |
Commissions |  | $ 155,449 | $ 165,775
Investment banking |  | 161,840 | 176,362
Revenue from contracts with customers |  | 516,338 | 541,656
Other |  | 3,782 | 3,718
Capital Raising [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment banking | [1] | 56,945 | 78,689
Advisory Fees [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment banking | [1] | 104,895 | 97,673
Asset Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  | 195,267 | 195,801
Global Wealth Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Commissions |  | 109,927 | 119,205
Investment banking |  | 8,223 | 7,688
Revenue from contracts with customers |  | 315,858 | 325,368
Other |  | 2,455 | 2,686
Global Wealth Management [Member] | Capital Raising [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment banking | [1] | 8,223 | 7,688
Global Wealth Management [Member] | Asset Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  | 195,253 | 195,789
Institutional Group [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Commissions |  | 45,522 | 46,570
Investment banking |  | 153,617 | 168,674
Revenue from contracts with customers |  | 199,153 | 215,256
Institutional Group [Member] | Capital Raising [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment banking | [1] | 48,722 | 71,001
Institutional Group [Member] | Advisory Fees [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment banking | [1] | 104,895 | 97,673
Institutional Group [Member] | Asset Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  | 14 | 12
Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  | 1,327 | 1,032
Other |  | 1,327 | 1,032
United States [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  | 493,925 | 502,750
United States [Member] | Global Wealth Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  | 315,858 | 325,368
United States [Member] | Institutional Group [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  | 176,740 | 176,350
United States [Member] | Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  | 1,327 | 1,032
United Kingdom [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  | 21,103 | 37,879
United Kingdom [Member] | Institutional Group [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  | 21,103 | 37,879
Other [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  | 1,310 | 1,027
Other [Member] | Institutional Group [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  | $ 1,310 | $ 1,027
[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=114873765&loc=SL114874048-224260 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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=114873765&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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