Derivative Instruments - Derivative Instruments Measured at Fair Value and Classification on Consolidated Balance Sheets (Detail) - Forward Foreign Exchange Contracts [Member] - Accrued and Other Current Liabilities [Member] - Designated As Hedging Instrument [Member] - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative Notional Amount	$ 60,756,000	$ 47,231,000
Derivative Fair Value	$ 639,000	$ 595,000