Stockholders' Equity and Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Beginning balance	1,840
Number of Shares, Granted	106
Number of Shares, Exercised	(416)
Number of Shares, Forfeited/Expired	(36)
Number of Shares, Ending balance	1,494	1,840
Number of Shares, Vested and expected to vest	1,494
Number of Shares, Exercisable	1,294
Weighted Average Exercise Price, Beginning balance	$ 23.89
Weighted Average Exercise Price, Granted	160.15
Weighted Average Exercise Price, Exercised	20.95
Weighted Average Exercise Price, Forfeited/ Expired	77.31
Weighted Average Exercise Price , Ending balance	33.09	$ 23.89
Weighted Average Exercise Price, Vested and expected to vest	33.09
Weighted Average Exercise Price, Exercisable	$ 19.63
Weighted Average Remaining Life, Outstanding	4 years	4 years 7 months 6 days
Weighted Average Remaining Life, Options vested or expected to vest	4 years
Weighted Average Remaining Life, Options exercisable	3 years 3 months 18 days
Aggregate Intrinsic Value, Outstanding	$ 187,398	$ 187,342
Aggregate Intrinsic Value, Options vested or expected to vest	187,398
Aggregate Intrinsic Value, Options exercisable	$ 179,688