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Share-Based Compensation - Summary of Stock Option Activity Plans (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Number of Options Outstanding    
Number of Options Outstanding, Beginning Balance 8,048  
Number of Options Outstanding, Granted 499  
Number of Options Outstanding, Exercised (91)  
Number of Options Outstanding, Canceled/Forfeited (200)  
Number of Options Outstanding, Ending Balance 8,256 8,048
Number of Options Outstanding, Vested and expected to vest 7,700  
Number of Options Outstanding, Exercisable 5,130  
Weighted-Average Exercise Price Per Share    
Weighted Average Exercise Price Per Share, Beginning Balance $ 10.27  
Weighted Average Exercise Price Per Share, Granted 16.01  
Weighted Average Exercise Price Per Share, Exercised 3.10  
Weighted Average Exercise Price Per Share, Canceled/Forfeited 15.27  
Weighted Average Exercise Price Per Share, Ending Balance 10.58 $ 10.27
Weighted Average Exercise Price Per Share, Vested and expected to vest 10.22  
Weighted Average Exercise Price Per Share, Exercisable $ 7.97  
Weighted-Average Contractual Term    
Weighted-Average Contractual Term 6 years 6 years 2 months 12 days
Weighted-Average Contractual Term, Vested and expected to vest 6 years  
Weighted-Average Contractual Term, Exercisable 5 years 9 months 18 days  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Outstanding $ 45,038 $ 107,091
Aggregate Intrinsic Value, Vested and expected to vest 44,613  
Aggregate Intrinsic Value, Exercisable $ 40,730