CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 905,611		$ 1,123,473		$ 970,876
Other comprehensive income (loss), net of tax
Net gain (loss) from foreign currency translation	(271,491)		(308,300)		117,331
Retirement and postretirement benefit plans	(72,796)		69,583		(17,650)
Deferred loss on interest rate hedges:
Increase in deferred loss associated with contract revaluation and settlement					(2,407)
Amount of loss reclassified to interest expense in consolidated statement of income	1,913		1,935		1,207
Other comprehensive income (loss)	(342,374)	[1]	(236,782)	[1]	98,481
Comprehensive Income	$ 563,237		$ 886,691		$ 1,069,357

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