Other Comprehensive Loss - Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Equity [Abstract]
Net income	$ 158,025	$ 161,010
Other comprehensive income (loss):
Foreign currency translation	63,366	(113,309)
Pension and other post-retirement benefit adjustments:
Recognition of prior service credit, net of tax	(222)	(240)
Recognition of actuarial loss, net of tax	4,955	6,078
Net actuarial loss, net of tax	0	0
Net current period other comprehensive income (loss)	68,099	(107,471)
Comprehensive income	$ 226,124	$ 53,539