Financial Derivatives and Hedging Activities - Income or (Loss) from Derivative Instruments Recognized in Results of Operations (Detail) - Forward Foreign Currency Exchange Contracts [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Costs of Products Sold [Member] | Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Effective portion of derivative instruments, gain (loss)	$ (1,344)	$ (29)	$ (4,939)	$ 1,687
Other - Net [Member] | Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Ineffective portion of derivative instruments, gain (loss)	207	40	(5)	126
Other - Net [Member] | Not Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative instruments, gain (loss)	$ (477)	$ 328	$ (1,078)	$ 719