Other Comprehensive Income (Loss) - Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Equity [Abstract]
Net income	$ 185,326	$ 188,016	$ 534,720	$ 544,399
Other comprehensive income (loss):
Foreign currency translation	11,896	(110,874)	50,840	(211,868)
Pension and other post-retirement benefit adjustments:
Recognition of prior service credit, net of tax	(222)	(240)	(666)	(721)
Recognition of actuarial loss, net of tax	4,981	6,029	14,934	18,214
Total other comprehensive income (loss)	16,655	(105,085)	65,108	(194,375)
Comprehensive income	$ 201,981	$ 82,931	$ 599,828	$ 350,024