- Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 41,134	$ 103,717	$ 211,017
State	7,264	4,780	16,609
Foreign	22,267	17,367	20,733
Deferred	75,634	(25,561)	(17,983)
Total provision for income taxes for continuing operations	$ 146,299	$ 100,303	$ 230,376