Other Comprehensive Income (Loss) - Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Equity [Abstract]
Net income	$ 189,972	$ 191,369	$ 350,132	$ 349,394
Other comprehensive income (loss):
Foreign currency translation	23,157	(24,422)	80,177	38,944
Pension and other post-retirement benefit adjustments:
Recognition of prior service credit, net of tax	(213)	(222)	(425)	(444)
Recognition of actuarial loss, net of tax	5,936	4,998	11,880	9,953
Total other comprehensive income (loss)	28,880	(19,646)	91,632	48,453
Comprehensive income	$ 218,852	$ 171,723	$ 441,764	$ 397,847