Income Taxes - Income Tax Expense Reconciliation (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income taxes computed at the federal statutory rate		$ 231,595	$ 211,124	$ 158,741
State income taxes, net of federal income tax benefit		23,738	23,919	18,800
Other, net	[1]	(18,898)	(14,758)	(5,625)
Total		$ 236,435	$ 220,285	$ 171,916

[1] Primarily attributable to tax benefits from the domestic production activities deduction.