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Equity-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Jan. 31, 2012
JVB Holdings [Member]
Jan. 31, 2011
JVB Holdings [Member]
Dec. 31, 2012
JVB Holdings [Member]
Dec. 31, 2011
JVB Holdings [Member]
Dec. 31, 2012
PrinceRidge [Member]
Dec. 31, 2011
PrinceRidge [Member]
Dec. 31, 2012
2010 Equity Incentive Plan [Member]
Dec. 31, 2011
2010 Equity Incentive Plan [Member]
Dec. 31, 2010
2010 Equity Incentive Plan [Member]
Dec. 31, 2012
Compensation and benefits [Member]
2010 Equity Incentive Plan [Member]
Dec. 31, 2011
Compensation and benefits [Member]
2010 Equity Incentive Plan [Member]
Dec. 31, 2010
Compensation and benefits [Member]
2010 Equity Incentive Plan [Member]
Dec. 31, 2012
Service Based Stock Unit [Member]
Dec. 31, 2011
Service Based Stock Unit [Member]
Dec. 31, 2010
Service Based Stock Unit [Member]
Dec. 31, 2012
2009 Equity Award Plan [Member]
Dec. 31, 2012
2009 Equity Award Plan [Member]
Time Based And Performance Based [Member]
Dec. 31, 2012
2009 Equity Award Plan [Member]
Compensation and benefits [Member]
Dec. 31, 2011
2009 Equity Award Plan [Member]
Compensation and benefits [Member]
Dec. 31, 2010
2009 Equity Award Plan [Member]
Compensation and benefits [Member]
Dec. 31, 2012
2009 Equity Award Plan [Member]
Service Based Stock Unit [Member]
Dec. 31, 2012
2006 Equity Incentive Plan [Member]
2010 Equity Incentive Plan [Member]
Dec. 31, 2012
2006 Equity Incentive Plan [Member]
Compensation and benefits [Member]
Restricted Stock [Member]
Dec. 31, 2012
2006 Equity Incentive Plan [Member]
Compensation and benefits [Member]
Restricted Stock Units [Member]
Dec. 31, 2012
2006 Equity Incentive Plan [Member]
Compensation and benefits [Member]
2010 Equity Incentive Plan [Member]
Restricted Stock [Member]
Dec. 31, 2011
2006 Equity Incentive Plan [Member]
Compensation and benefits [Member]
2010 Equity Incentive Plan [Member]
Restricted Stock [Member]
Dec. 31, 2012
2006 Equity Incentive Plan [Member]
Compensation and benefits [Member]
2010 Equity Incentive Plan [Member]
Restricted Stock Units [Member]
Dec. 31, 2011
2006 Equity Incentive Plan [Member]
Compensation and benefits [Member]
2010 Equity Incentive Plan [Member]
Restricted Stock Units [Member]
Dec. 31, 2012
2006 Equity Incentive Plan [Member]
Service Based Stock Unit [Member]
2010 Equity Incentive Plan [Member]
Restricted Stock [Member]
Dec. 31, 2011
2006 Equity Incentive Plan [Member]
Service Based Stock Unit [Member]
2010 Equity Incentive Plan [Member]
Restricted Stock [Member]
Dec. 31, 2010
2006 Equity Incentive Plan [Member]
Service Based Stock Unit [Member]
2010 Equity Incentive Plan [Member]
Restricted Stock [Member]
Dec. 31, 2012
2006 Equity Incentive Plan [Member]
Service Based Stock Unit [Member]
2010 Equity Incentive Plan [Member]
Restricted Stock Units [Member]
Dec. 31, 2011
2006 Equity Incentive Plan [Member]
Service Based Stock Unit [Member]
2010 Equity Incentive Plan [Member]
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                    
Award vesting period                                   Three years                                
Maximum number of shares authorized, equity incentive plans                                 1,721,160           4,996,500                      
Shares remain available to be issued                                 0           2,411,621                      
Restricted units outstanding vested                                 116,595                                  
Weighted average grant date fair value per share $ 0.00       $ 4.89                 $ 0 $ 0 $ 0     $ 0.00 $ 0.00 $ 5.28     $ 1.47   $ 1.47 $ 4.88 $ 0.00 $ 3.07 $ 1.43 $ 4.33 $ 5.85 $ 1.51 $ 3.26
Restricted units or shares, vested                                     72,088     44,507   100,000                    
Restricted units, vested with no remaining service condition                                           19,507                        
Fair value of awards vested       $ 326             $ 947 $ 570 $ 580           $ 166                              
Equity-based compensation expense       911 879 (344) 687 1,290 5,708 1,361                 (586) 400 1,144                          
Number of units or shares issued   186,339 559,020                                                              
Restricted units outstanding, JVB acquisition       372,681 559,020                                                          
Accrued compensation expense attributable to an award                 1,800                                                  
Restricted stock granted                 360,000                             32,258 500,000                  
Cash payment in exchange for forfeiture of restricted stock, value                 745                                                  
Unrecognized compensation expense related to unvested awards $ 1,711                                                                  
Weighted average period over which restricted stock expense expected to be recognized 1 year