Stock-Based Compensation Expense - Summary of Stock Option Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Shares
Beginning balance outstanding | shares	13,789
Granted | shares	2,990
Exercised | shares	(3,018)
Forfeited or expired | shares	(862)
Ending balance outstanding | shares	12,899
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance outstanding, weighted-average exercise price | $ / shares	$ 31.73
Granted, weighted-average exercise price | $ / shares	51.25
Exercised, weighted-average exercise price | $ / shares	21.40
Forfeited or expired, weighted-average exercise price | $ / shares	42.53
Ending balance outstanding, weighted-average exercise price | $ / shares	$ 37.95
Exercisable, Shares | shares	4,775
Options vested or expected to vest | shares	11,724
Exercisable, weighted-average exercise price | $ / shares	$ 26.67
Options vested or expected to vest, weighted-average exercise price | $ / shares	$ 36.84
Outstanding, weighted-average remaining contractual term (in years)	7 years 1 month 20 days
Exercisable, weighted-average remaining contractual term (in years)	5 years 7 months 9 days
Options vested or expected to vest, weighted-average remaining contractual term (in years)	7 years
Outstanding, aggregate intrinsic value | $	$ 236,318
Exercisable, aggregate intrinsic value | $	141,277
Options vested or expected to vest, aggregate intrinsic value | $	$ 227,779