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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, 2017
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Outstanding, Shares | shares 12,866
Granted | shares 4,293
Exercised | shares (4,162)
Forfeited or expired | shares (271)
Outstanding, Shares | shares 12,726
Exercisable, Shares | shares 2,944
Options vested or expected to vest | shares 11,276
Outstanding, Weighted-Average Exercise Price | $ / shares $ 16.08
Granted, Weighted-Average Exercise Price | $ / shares 40.82
Exercised, Weighted-Average Exercise Price | $ / shares 13.11
Forfeited or expired, Weighted-Average Exercise Price | $ / shares 23.28
Outstanding, Weighted-Average Exercise Price | $ / shares 25.24
Exercisable, Weighted-Average Exercise Price | $ / shares 14.53
Options vested or expected to vest, Weighted-Average Exercise Price | $ / shares $ 24.44
Outstanding, Weighted-Average Remaining Contractual Term (in years) 7 years 8 months 12 days
Exercisable, Weighted-Average Remaining Contractual Term (in years) 5 years 6 months
Options vested or expected to vest, Weighted-Average Remaining Contractual Term (in years) 7 years 7 months 6 days
Outstanding, Aggregate Intrinsic Value | $ $ 457,703
Exercisable, Aggregate Intrinsic Value | $ 137,291
Options vested or expected to vest, Aggregate Intrinsic Value | $ $ 414,567