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Stock-Based Compensation Expense - Summary of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Outstanding, Shares | shares 6,812
Granted | shares 1,519
Exercised | shares (1,520)
Forfeited or expired | shares (167)
Outstanding, Shares | shares 6,644
Exercisable, Shares | shares 2,596
Options vested or expected to vest | shares 6,065
Outstanding, Weighted-Average Exercise Price | $ / shares $ 23.26
Granted, Weighted-Average Exercise Price | $ / shares 41.00
Exercised, Weighted-Average Exercise Price | $ / shares 18.14
Forfeited or expired, Weighted-Average Exercise Price | $ / shares 31.94
Outstanding, Weighted-Average Exercise Price | $ / shares 28.27
Exercisable, Weighted-Average Exercise Price | $ / shares 17.69
Options vested or expected to vest, Weighted-Average Exercise Price | $ / shares $ 27.29
Outstanding, Weighted-Average Remaining Contractual Term (in years) 7 years 1 month 10 days
Exercisable, Weighted-Average Remaining Contractual Term (in years) 5 years 3 months 22 days
Options vested or expected to vest, Weighted-Average Remaining Contractual Term (in years) 6 years 11 months 16 days
Outstanding, Aggregate Intrinsic Value | $ $ 57,955
Exercisable, Aggregate Intrinsic Value | $ 43,597
Options vested or expected to vest, Aggregate Intrinsic Value | $ $ 57,291