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Shared-Based Payments - Schedule of Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 16, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Shares, Outstanding, Beginning Balance 3,249,541      
Shares, Granted 1,307,101      
Shares, Exercised (1,268,049) (863,176) (49,883)  
Shares, Forfeited or expired (87,635)      
Shares, Outstanding, Ending Balance 3,200,958 3,249,541    
Shares, Exercisable 1,688,251      
Shares, Vested and expected to vest 3,022,948      
Weighted- Average Exercise Price, Outstanding, Beginning Balance $ 0.94     $ 0.94
Weighted- Average Exercise Price, Granted $ 10.70      
Weighted- Average Exercise Price, Exercised $ 0.85      
Weighted- Average Exercise Price, Forfeited or expired $ 1.11      
Weighted- Average Exercise Price, Outstanding, Ending Balance $ 4.90 $ 0.94   $ 0.94
Weighted- Average Exercise Price, Exercisable $ 0.94      
Weighted- Average Exercise Price, Vested and expected to vest $ 4.64      
Weighted- Average Remaining Contractual Term, Outstanding 6 years 10 months 24 days 7 years 3 months 18 days    
Weighted- Average Remaining Contractual Term, Exercisable 4 years 9 months 18 days      
Weighted- Average Remaining Contractual Term, Vested and expected to vest 6 years 9 months 18 days      
Aggregate Intrinsic Value, Outstanding, Ending Balance $ 67,532      
Aggregate Intrinsic Value, Exercisable 42,311      
Aggregate Intrinsic Value, Vested and expected to vest $ 64,574