Income Taxes - Components of (Benefit) Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 198,498	$ 1,559	$ 0
State	34,608	746	755
Foreign	1,136	2,007	6,575
Total current provision	234,242	4,312	7,330
Deferred:
Federal	(2,855)	1,234	(9,970)
State	(1,104)	(1,186)	(7,944)
Foreign	(251)	(103)	(215)
Total deferred (benefit) provision	(4,210)	(55)	(18,129)
Provision (benefit) for income taxes	230,032	4,257	(10,799)
Accrued interest and penalties associated with uncertain tax positions	$ 500	$ 400	$ 300