Income Taxes - Income Taxes Expense from Continuing Operations (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Current income tax expense		$ 132,806	$ 174,284	$ 169,319
Deferred income tax expense		99,839	75,610	87,284
Income tax expense from continuing operations	[1]	$ 232,645	$ 249,894	$ 256,603

[1] Certain current year amounts were prospectively adjusted to give effect to the adoption of ASU 2016-09 related to excess tax benefits from stock compensation as described in Note 1—Significant Accounting Policies under "Accounting Pronouncements Adopted in the Current Year."