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Goodwill - Schedule of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Line Items]    
Goodwill $ 11,113 $ 11,206
Cira SCM [Member]
   
Goodwill [Line Items]    
Cira SCM 3,121 3,121
AFN [Member]
   
Goodwill [Line Items]    
Goodwill 110 110
JVB Holdings [Member]
   
Goodwill [Line Items]    
Goodwill 6,983 6,983
PrinceRidge [Member]
   
Goodwill [Line Items]    
Goodwill $ 899 $ 992