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Share-Based Compensation - Summary of RSUs Activity (Detail) - Restricted Stock Units - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Number of RSUs Outstanding, Beginning Balance 2,288  
Number of RSUs Outstanding, Granted 1,088  
Number of RSUs Outstanding, Exercised (175)  
Number of RSUs Outstanding, Canceled/Forfeited (79)  
Number of RSUs Outstanding, Ending Balance 3,122  
Weighted Average Grant Date Fair Value Per Share, Beginning Balance $ 16.63  
Weighted Average Grant Date Fair Value Per Share, Granted 16.28  
Weighted Average Grant Date Fair Value Per Share, Exercised 15.86  
Weighted Average Grant Date Fair Value Per Share, Canceled/Forfeited 16.49  
Weighted Average Grant Date Fair Value Per Share, Ending Balance $ 16.55  
Aggregate Intrinsic Value, Outstanding $ 49,196 $ 53,972