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Sale of Equity Derivatives Business, Management Contracts, and Investment Advisory Agreements (Details) (USD $)	12 Months Ended
	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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The carrying amount of assets an investment adviser manages on behalf of investors.

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Amount of operating income or loss attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

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