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Equity and Stock-based Compensation - Stock Plans - Summary of Stock Option Transactions (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Outstanding, Beginning Balance, Shares | shares 13,660
Granted, Shares | shares 1,923
Exercised, Shares | shares (3,827)
Expired, Shares | shares (34)
Forfeited, Shares | shares (172)
Outstanding, Ending Balance, Shares | shares 11,550
Vested and expected to vest, Shares | shares 11,550
Exercisable, Shares | shares 8,319
Outstanding, Beginning Balance, Weighted Average Exercise per Share | $ / shares $ 11.35
Granted, Weighted Average Exercise per Share | $ / shares 26.95
Exercised, Weighted Average Exercise per Share | $ / shares 8.10
Expired, Weighted Average Exercise per Share | $ / shares 24.58
Forfeited, Weighted Average Exercise per Share | $ / shares 22.05
Outstanding, Ending Balance, Weighted Average Exercise per Share | $ / shares 14.82
Vested and expected to vest, Weighted Average Exercise per Share | $ / shares 14.82
Exercisable, Weighted Average Exercise per Share | $ / shares $ 10.98
Outstanding, Weighted Average Remaining Contractual Life 5 years 9 months 18 days
Vested and expected to vest, Weighted Average Remaining Contractual Life 5 years 9 months 18 days
Exercisable, Weighted Average Remaining Contractual Life 4 years 8 months 15 days
Outstanding, Aggregate Intrinsic Value | $ $ 376,670
Vested and expected to vest, Aggregate Intrinsic Value | $ 376,670
Exercisable, Aggregate Intrinsic Value | $ $ 303,049