Fair Values of Derivative Not Designated as Hedging Instruments Recorded in Consolidated Balance Sheet (Detail) - Foreign currency contracts - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	$ 405	$ 7,369
Other accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	(8,202)	$ (3,671)
Other long-term liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	$ (600)