Other Comprehensive Loss - Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Equity [Abstract]
Net income	$ 188,016	$ 190,516	$ 544,399	$ 545,727
Other comprehensive loss:
Foreign currency translation	(110,874)	(94,957)	(211,868)	(56,318)
Pension and other post-retirement benefit adjustments:
Recognition of prior service credit, net of tax	(240)	(490)	(721)	(1,470)
Recognition of actuarial loss, net of tax	6,029	4,424	18,214	13,005
Net actuarial loss, net of tax		(4,416)		(4,416)
Net current period other comprehensive income (loss)	(105,085)	(95,439)	(194,375)	(49,199)
Comprehensive income	$ 82,931	$ 95,077	$ 350,024	$ 496,528