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Net Capital Requirements - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
JVB [Member]
   
Net Capital Requirements [Line Items]    
Adjusted net capital $ 10,833 $ 9,558
Amount in excess of minimum capital requirement 10,689 9,426
PrinceRidge [Member]
   
Net Capital Requirements [Line Items]    
Adjusted net capital 17,846 4,606
Amount in excess of minimum capital requirement 17,596 4,356
Cohen and Company Financial Limited [Member]
   
Net Capital Requirements [Line Items]    
Minimum net liquid capital required 2,887 1,820
Net liquid capital 5,864 4,881
Amount in excess of minimum capital $ 2,977 $ 3,061