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Sale of Equity Derivatives Brokerage Business, Management Contracts, and Investment Advisory Agreements - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 CLO Management Contracts [Member] | Jul. 29, 2010 ATP Management, LLC [Member] | Dec. 31, 2012 ATP Management, LLC [Member] | Dec. 31, 2012 FGC Buyer [Member] | Dec. 31, 2012 Cira SCM [Member] | Dec. 31, 2012 One-time option [Member] | Dec. 31, 2012 Revenue earned between January 1, 2014 - December 31, 2014 [Member] | Jul. 29, 2010 Cohen & Company Financial Management, LLC [Member]
Investment Management And Other Fees And Related Party Transactions [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue share allocation percentage |  |  |  |  |  | 4.50% | 10.00% |  |  |
Capital transaction allocation percentage |  |  |  |  |  | 10.00% |  |  |  |
Aggregate amount available to borrow from the Company | $ 1,000,000 |  |  |  |  |  |  |  |  |
Accrued interest rate on loan | 12.00% |  |  |  |  |  |  |  |  |
Revenue generated by equity derivative business | 7,842,000 | 7,946,000 |  |  |  |  |  |  |  |
Operating income generated by equity derivative business | 711,000 | 979,000 |  |  |  |  |  |  |  |
Company's one time option to purchase |  |  |  |  |  |  |  | 10.00% |  |
Percentage of revenue earned and collected by the SCM Buyer as purchase price |  |  |  |  |  |  |  |  | 20.00% |
SCM Buyer Repurchase Option |  |  |  |  |  |  | 10.00% |  |  |
Percentage of revenue earned and collected by the SCM Buyer for the Buyer's repurchase option |  |  |  |  |  |  | 30.00% |  |  |
Assets under management | 6,100,000,000 |  |  |  |  |  | 1,100,000,000 |  |  | 3,800,000,000
Percentage of fee for ongoing management |  |  |  |  |  |  | 10.00% |  |  |
Deferred Revenue | 498,000 | 1,761,000 |  |  |  |  |  |  |  | 4,831,000
Term of Services Agreement |  |  |  | 3 years |  |  |  |  |  |
Fees under Services Agreement |  |  |  |  | 13,618,000 |  |  |  |  |
Deferred revenue related to contracts | 216,000 | 1,510,000 |  |  |  |  |  |  |  |
Subordinated management fees received from unrelated third party related to CLO |  |  | $ 971,000 |  |  |  |  |  |  |

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