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Stock-Based Compensation - Summary of Restricted Stock Unit Activity (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2015
shares
Dec. 31, 2014
shares
Dec. 31, 2013
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted 2,595,000 0 0
Restricted stock units vest description 349,518 of these restricted stock units vest and convert into shares of our common stock after one year from the date of grant. 2,331,250 of these restricted stock units vest and convert into shares of our common stock over a three year period from the date of grant: one-third of the award will vest on each grant date anniversary following the grant. The remaining restricted units granted vest upon the attainment of certain performance goals established by the Compensation Committee or the Single Member Committee established under our 2006 Equity Incentive Plan and our 2013 Equity Incentive Plan.    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted units would vest over vesting period 349,518    
Restricted stock units vest and convert into shares of our common stock 1 year    
Restricted Stock Two [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of restricted units would vest over vesting period 2,331,250    
Restricted stock units vest and convert into shares of our common stock 3 years    
Restricted stock units vested description after specified period 0.333    
Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of RSUs, Granted 7,540,768    
Unvested stock options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted 2,595,000