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Contingencies - Narrative (Details) - USD ($) |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 27, 2017 | Feb. 17, 2015 | Feb. 09, 2015 | Jan. 27, 2015 | Jun. 30, 2015 | Jun. 30, 2014
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation Settlement, Expense |  |  |  |  |  | $ 20,000,000
Minimum estimated range of aggregate loss for legal proceedings |  |  |  |  | $ 0 |
Maximum estimated range of aggregate loss for legal proceedings |  |  |  |  | 35,000,000 |
Company purchased and holds auction rate securities |  |  |  |  | 107,600,000 |
Amount of ARS committed to purchase from clients |  |  |  |  | 16,700,000 |
Purchase Commitments Outstanding, Auction Rate Securities Related to Settlements with Regulators |  |  |  |  | 5,000,000 |
Eligible investor subject to future buyback potential additional losses related to valuation adjustments |  |  |  |  | 85,300,000 |
Eligible Investor Subject To Future Buyback Potential Additional Losses Related To Valuation Adjustments |  |  |  |  | $ 0 |
Period of auction rates security to be purchased from rendering of the award |  |  |  |  | 30 days |
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 |  |  |  |  |

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- 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 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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