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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2018
Investment Banking [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 362,726 | $ 1,249,490
Investment Banking [Member] | Advisory Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 305,949 | 1,047,259
Investment Banking [Member] | Underwriting Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 11,440 | 62,784
Investment Banking [Member] | Commissions and Related Fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 45,337 | 139,447
Investment Management [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 12,678 | 36,603
Investment Management [Member] | Wealth Management [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 11,560 | 33,826
Investment Management [Member] | Institutional Asset Management [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 1,118 | $ 2,777

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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