Other Comprehensive Income (Loss) - Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Equity [Abstract]
Net income	$ 190,516	$ 173,746	$ 545,727	$ 534,492
Other comprehensive (loss) income:
Foreign currency translation	(94,957)	5,369	(56,318)	(116,900)
Pension and other post-retirement benefit adjustments:
Recognition of prior service credit, net of tax	(490)	(1,314)	(1,470)	(3,956)
Recognition of actuarial loss, net of tax	4,424	12,726	13,005	38,906
Net actuarial (loss) gain, net of tax	(4,416)	1,790	(4,416)	1,790
Net current period other comprehensive income (loss)	(95,439)	18,571	(49,199)	(80,160)
Comprehensive income	$ 95,077	$ 192,317	$ 496,528	$ 454,332