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	Jun. 30, 2018	Dec. 31, 2017
Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	$ 4,598	$ 405
Other accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	$ (166)	(8,202)
Other long-term liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value		$ (600)