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Share-Based Compensation - Schedule of Tier II Equity Award Activity (Detail)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted during the period 19,500  
Promote Plan [member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Nonvested awards 11,195,791  
Promote Plan [member] | Tier II [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted during the period 8,628,050  
Shares forfeited during period (13,810,744)  
Tier II awards exchanged for restricted shares of common stock (223,864,424)  
Nonvested awards 0 229,047,118