Other Comprehensive Income - Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Equity [Abstract]
Net income	$ 173,746	$ 172,943	$ 534,492	$ 487,816
Other comprehensive income (loss):
Foreign currency translation	5,369	25,802	(116,900)	29,727
Pension and other post-retirement benefit adjustments:
Recognition of prior service credit, net of tax	(1,314)	(1,241)	(3,956)	(3,715)
Recognition of actuarial loss, net of tax	12,726	10,812	38,906	32,955
Net actuarial gain, net of tax	1,790	2,226	1,790	2,226
Net current period other comprehensive income (loss)	18,571	37,599	(80,160)	61,193
Comprehensive income	$ 192,317	$ 210,542	$ 454,332	$ 549,009