Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
Federal, current	$ 241,074	$ 633,868	$ 504,865
State, current	62,685	96,622	37,308
Foreign, current	8,981	14,800	48,386
Total current	312,740	745,290	590,559
Federal, deferred	101,946	4,953	(207,006)
State, deferred	8,013	6,847	(4,533)
Foreign, deferred	(10,802)	(8,783)	(9,634)
Total deferred	99,157	3,017	(221,173)
Total provision for income taxes	$ 411,897	$ 748,307	$ 369,386