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Contingencies - Narrative (Details) - USD ($) |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 27, 2017 | Feb. 17, 2015 | Feb. 09, 2015 | Jan. 27, 2015 | Mar. 31, 2016
Loss Contingencies [Line Items] |  |  |  |  |
Minimum estimated range of aggregate loss for legal proceedings |  |  |  |  | $ 0
Maximum estimated range of aggregate loss for legal proceedings |  |  |  |  | 49,000,000
Auction rate securities, firm purchased and hold |  |  |  |  | 87,100,000
Amount of ARS committed to purchase from clients |  |  |  |  | 32,500,000
Eligible investor subject to future buyback potential additional losses related to valuation adjustments |  |  |  |  | 37,300,000
Eligible Investor Subject To Future Buyback Potential Additional Losses Related To Valuation Adjustments |  |  |  |  | 0
Litigation settlement, expense |  |  |  |  | $ 10,000,000
SEC [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Litigation settlement, amount |  |  |  | $ 10,000,000 |
Payments for legal settlements |  | $ 5,000,000 |  |  |
SEC [Member] | Disgorgement [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Litigation settlement, amount |  |  |  | 4,200,000 |
SEC [Member] | Prejudgment Interest [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Litigation settlement, amount |  |  |  | 753,500 |
SEC [Member] | Civil Penalties [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Litigation settlement, amount |  |  |  | 5,100,000 |
United States Department of the Treasury [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Litigation settlement, amount |  |  |  | $ 10,000,000 |
Payments for legal settlements |  |  | $ 5,000,000 |  |
Forecast [Member] | SEC [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Payments for legal settlements | $ 5,000,000 |  |  |  |

X
- Definition The total amount of ARS the firm purchased and hold. + References No definition available. + Details
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- Definition The amount of ARS the firm committed to purchase from clients. + References No definition available. + Details
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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 Eligible Investor Subject To Future Buyback Principal Value + References No definition available. + Details
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- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + 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 estimated maximum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
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