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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Commissions | [1] | $ 166,902 |  |  | $ 332,677 |  |
Revenue from contracts with customers | [1] | 531,349 |  |  | 1,073,005 |  |
Other | [1] | 3,796 |  |  | 7,514 |  |
Capital Raising [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Investment banking | [1] | 74,080 |  |  | 152,769 |  |
Advisory Fees [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Investment banking | [1] | 87,003 |  |  | 184,676 |  |
Asset Management [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers |  | 199,568 | [1] | $ 172,914 | 395,369 | [1] | $ 335,653
Global Wealth Management [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Commissions | [1] | 118,129 |  |  | 237,334 |  |
Revenue from contracts with customers | [1] | 329,531 |  |  | 655,931 |  |
Other | [1] | 3,796 |  |  | 7,514 |  |
Global Wealth Management [Member] | Capital Raising [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Investment banking | [1] | 7,968 |  |  | 15,656 |  |
Global Wealth Management [Member] | Advisory Fees [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Investment banking | [1] | 81 |  |  | 81 |  |
Global Wealth Management [Member] | Asset Management [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | [1] | 199,557 |  |  | 395,346 |  |
Institutional Group [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Commissions | [1] | 48,773 |  |  | 95,343 |  |
Revenue from contracts with customers | [1] | 201,818 |  |  | 417,074 |  |
Institutional Group [Member] | Capital Raising [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Investment banking | [1] | 66,112 |  |  | 137,113 |  |
Institutional Group [Member] | Advisory Fees [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Investment banking | [1] | 86,922 |  |  | 184,595 |  |
Institutional Group [Member] | Asset Management [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | [1] | 11 |  |  | 23 |  |
United States [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | [1] | 502,946 |  |  | 1,005,696 |  |
United States [Member] | Global Wealth Management [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | [1] | 329,531 |  |  | 655,931 |  |
United States [Member] | Institutional Group [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | [1] | 173,415 |  |  | 349,765 |  |
Europe [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | [1] | 25,953 |  |  | 63,832 |  |
Europe [Member] | Institutional Group [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | [1] | 25,953 |  |  | 63,832 |  |
Other [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | [1] | 2,450 |  |  | 3,477 |  |
Other [Member] | Institutional Group [Member] |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers | [1] | $ 2,450 |  |  | $ 3,477 |  |
[1] | Excludes revenue 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 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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