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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, 2019
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Outstanding, Beginning Balance, Shares | shares 10,430
Granted, Shares | shares 1,909
Exercised, Shares | shares (1,642)
Expired, Shares | shares (21)
Forfeited, Shares | shares (658)
Outstanding, Ending Balance, Shares | shares 10,018
Vested and expected to vest, Shares | shares 10,018
Exercisable, Shares | shares 7,318
Outstanding, Beginning Balance, Weighted Average Exercise per Share | $ / shares $ 20.25
Granted, Weighted Average Exercise per Share | $ / shares 53.75
Exercised, Weighted Average Exercise per Share | $ / shares 10.15
Expired, Weighted Average Exercise per Share | $ / shares 50.40
Forfeited, Weighted Average Exercise per Share | $ / shares 44.65
Outstanding, Ending Balance, Weighted Average Exercise per Share | $ / shares 26.63
Vested and expected to vest, Weighted Average Exercise per Share | $ / shares 26.63
Exercisable, Weighted Average Exercise per Share | $ / shares $ 18.63
Outstanding, Weighted Average Remaining Contractual Life 5 years 2 months 1 day
Vested and expected to vest, Weighted Average Remaining Contractual Life 5 years 2 months 1 day
Exercisable, Weighted Average Remaining Contractual Life 3 years 10 months 20 days
Outstanding, Aggregate Intrinsic Value | $ $ 193,226
Vested and expected to vest, Aggregate Intrinsic Value | $ 193,226
Exercisable, Aggregate Intrinsic Value | $ $ 183,707