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Commitments and Contingencies - Additional Information (Narrative) (Details) | 6 Months Ended
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Jun. 30, 2018 USD ($)
Loss Contingencies [Line Items] |
Eligible investor subject to future buyback principal value | $ 21,200,000
Minimum [Member] |
Loss Contingencies [Line Items] |
Maximum estimated range of aggregate loss for legal proceedings | 0
Eligible investor subject to future buyback potential additional losses related to valuation adjustments | 0
Maximum [Member] |
Loss Contingencies [Line Items] |
Maximum estimated range of aggregate loss for legal proceedings | 30,000,000
Auction rate securities |
Loss Contingencies [Line Items] |
Auction Rate Securities Committed To Purchase related to settlements with regulators | 5,000,000
Total amount of ARS the firm purchased and hold | $ 92,300,000

X
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- Definition Eligible investor subject to future buyback potential additional losses related to valuation adjustments. + References No definition available. + 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 The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 05 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6395354&loc=d3e12631-108344 + Details
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