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Financial Derivatives and Hedging Activities - Fair Values of Derivative Instruments (Detail) - Forward Foreign Currency Exchange Contracts [Member] - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Designated as Hedging [Member] | Prepaid Expenses and Other Current Assets [Member]    
Derivatives Fair Value [Line Items]    
Derivative asset, fair value $ 2,625 $ 955
Designated as Hedging [Member] | Other Current Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Derivative liability, fair value 1,493 1,545
Not Designated as Hedging [Member] | Prepaid Expenses and Other Current Assets [Member]    
Derivatives Fair Value [Line Items]    
Derivative asset, fair value 60 68
Not Designated as Hedging [Member] | Other Current Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Derivative liability, fair value $ 104 $ 49