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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
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