Other Comprehensive Income (Loss) - Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Equity [Abstract]
Net income	$ 191,369	$ 195,373	$ 349,394	$ 356,383
Other comprehensive income (loss):
Foreign currency translation	(24,422)	12,315	38,944	(100,994)
Pension and other post-retirement benefit adjustments:
Recognition of prior service credit, net of tax	(222)	(241)	(444)	(481)
Recognition of actuarial loss, net of tax	4,998	6,107	9,953	12,185
Total other comprehensive (loss) income	(19,646)	18,181	48,453	(89,290)
Comprehensive income	$ 171,723	$ 213,554	$ 397,847	$ 267,093