Income Taxes Components of Income Tax Expense Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income from continuing operations before income taxes and equity in net income of unconsolidated investments:
Domestic	$ (8,293)	$ 49,630	$ (15,861)
Foreign	455,091	465,634	326,605
Income from continuing operations before income taxes and equity in net income of unconsolidated investments	446,798	515,264	310,744
Current income tax expense (benefit):
Federal	394,747	7,717	76,778
State	323	1,407	(983)
Foreign	78,688	63,957	58,710
Total	473,758	73,081	134,505
Deferred income tax (benefit) expense:
Federal	(58,640)	12,230	(127,212)
State	(2,288)	(1,715)	(1,267)
Foreign	18,987	12,667	5,108
Total	(41,941)	23,182	(123,371)
Total income tax expense	$ 431,817	$ 96,263	$ 11,134