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Sale of Equity Derivatives Business, Management Contracts, and Investment Advisory Agreements (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Assets under Management, Carrying Amount | $ 5,700,000,000 |  |
Equity Derivatives Brokerage Business [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Revenue share allocation percentage | 4.50% |  |
Capital transaction allocation percentage | 10.00% |  |
Disposal Group, Including Discontinued Operation, Revenue |  | 7,842,000 | 7,946,000
Disposal Group, Including Discontinued Operation, Operating Income (Loss) |  | 711,000 | 979,000
Strategos Deep Value Funds Asset Management Rights [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Revenue share allocation percentage | 10.00% |  |
Company's one time option to purchase | 10.00% |  |
Percentage Of Revenue Earned And Collected By Buyer As Purchase Price | 20.00% |  |
Percentage Of Revenue Earned And Collected By Buyer For Repurchase Option | 30.00% |  |
Percentage of Management Fees Related To Collateralized Debt Obligation High End of Range | 10.00% |  |
Collateralized Debt Obligations [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Assets under Management, Carrying Amount | 5,400,000,000 |  |
Collateralized Debt Obligations [Member] | Strategos Deep Value Funds Asset Management Rights [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Assets under Management, Carrying Amount | $ 363,500,000 |  |

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