Components of Income Tax Expense Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Current, Federal	$ 268,974	$ 225,663	$ 195,862
Current, Foreign	13,978	9,284	13,699
Current, State	43,333	40,152	37,555
Current, Total	326,285	275,099	247,116
Deferred, Federal	(20,382)	(27,073)	(6,216)
Deferred, Foreign	(2,496)	1,874	(666)
Deferred, State	(4,114)	(11,106)	(3,592)
Deferred, Total	(26,992)	(36,305)	(10,474)
Provision for income taxes	$ 299,293	$ 238,794	$ 236,642