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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, 2018
Dec. 31, 2017
Designated as Hedging [Member] | Prepaid Expenses and Other Current Assets [Member]    
Derivatives Fair Value [Line Items]    
Derivative asset, fair value $ 4,381 $ 1,066
Designated as Hedging [Member] | Other Current Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Derivative liability, fair value 1,548 4,787
Not Designated as Hedging [Member] | Prepaid Expenses and Other Current Assets [Member]    
Derivatives Fair Value [Line Items]    
Derivative asset, fair value 103 151
Not Designated as Hedging [Member] | Other Current Liabilities [Member]    
Derivatives Fair Value [Line Items]    
Derivative liability, fair value $ 122 $ 43