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Equity-Based Compensation - Summary of Restricted Unit Activity with Respect to 2009 Equity Award Plan (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Forfeited (1,508,353) (1,348,361) (694)
Service Based Vesting [Member] | 2009 Equity Award Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested, balance 207,383    
Vested (44,507)    
Forfeited (140,007)    
Cancelled (22,869)    
Unvested, balance       
Unvested, Weighted Average Grant Date Fair Value, balance 7.29    
Vested, Weighted Average Grant Date Fair Value 7.03    
Forfeited, Weighted Average Grant Date Fair Value 7.25    
Cancelled, Weighted Average Grant Date Fair Value 8.05    
Compensation and benefits [Member] | 2009 Equity Award Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested, balance 102,128    
Vested (72,088)    
Forfeited (30,040)    
Unvested, balance       
Unvested, Weighted Average Grant Date Fair Value, balance 6.87    
Vested, Weighted Average Grant Date Fair Value 6.90    
Forfeited, Weighted Average Grant Date Fair Value 6.80