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Acquisitions - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jan. 13, 2011
Dec. 31, 2011
Restricted units [Member]
Sep. 30, 2010
Fairfax, LLC [Member]
Dec. 31, 2012
Fairfax, LLC [Member]
Broker-dealer license [Member]
Jan. 31, 2012
JVB Holdings [Member]
Jan. 31, 2011
JVB Holdings [Member]
Jan. 13, 2011
JVB Holdings [Member]
Dec. 31, 2012
JVB Holdings [Member]
Dec. 31, 2011
JVB Holdings [Member]
Dec. 31, 2010
JVB Holdings [Member]
Jan. 31, 2012
JVB Holdings [Member]
Restricted units [Member]
Jan. 31, 2011
JVB Holdings [Member]
Restricted units [Member]
Jan. 13, 2011
JVB Holdings [Member]
Restricted units [Member]
Dec. 31, 2012
JVB Holdings [Member]
Restricted units [Member]
Jan. 13, 2011
JVB Holdings [Member]
Management Employees [Member]
Dec. 31, 2012
PrinceRidge [Member]
Dec. 31, 2011
PrinceRidge [Member]
Dec. 31, 2010
PrinceRidge [Member]
May 31, 2011
PrinceRidge [Member]
Dec. 31, 2012
PrinceRidge [Member]
Operating LLC [Member]
Business Acquisition [Line Items]                                              
Purchase price           $ 297     $ 16,813                         $ 18,409  
Other assets of acquiree           220 166                                
Cash consideration   14,956   15,044         14,956 5,646                          
Number of units or shares issued         559,020     186,339 313,051 313,051       186,339 559,020 559,020 372,681            
Cash consideration for Management employees                                   2,482          
Escrow cash receivables       88           484                          
Amount withheld for payment to Sellers       384           384                          
Revenue 95,240 100,331 125,552               23,072 18,637             43,925 27,406      
Net income (loss) attributable to parent entity (968) (9,388) 7,595               1,997 192             386 5,003      
Proforma revenue                         150,361             114,007 150,294    
Proforma net income                         7,727             (10,527) 5,097    
Business acquisition purchase price allocation goodwill                       6,983             899 992      
Consideration for PrinceRidge Acquisition                                           45,000  
Percentage ownership in subsidiary   70.00%                                 98.00% 70.00%     98.00%
Adjustment reduced goodwill allocated to non-controlling interest                                     $ 93