CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (1,595,426)	$ 245,707	$ (1,683,701)		$ 530,373
Other comprehensive income (loss), net of tax
Net loss from foreign currency translation	(195,440)	(192,329)	(462,054)		(195,374)
Retirement and postretirement benefit plans	3,116	1,505	9,105		3,996
Deferred loss on interest rate hedges reclassified to interest expense	482	484	1,445		1,450
Other comprehensive loss	(191,842)	(190,340)	(451,504)	[1]	(189,928)
Comprehensive Income (Loss)	$ (1,787,268)	$ 55,367	$ (2,135,205)		$ 340,445

[1] All amounts are presented net of income taxes.