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Derivative Instruments and Hedging Activities Carrying Values of Derivative Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Derivative Net Carrying Value $ 3,789 $ (426)
Designated as Hedging Instrument    
Derivative [Line Items]    
Derivative Net Carrying Value 3,789 (426)
Designated as Hedging Instrument | Foreign Exchange Contract    
Derivative [Line Items]    
Derivative Net Carrying Value [1] 3,010 (426)
Designated as Hedging Instrument | Interest rate contract    
Derivative [Line Items]    
Derivative Net Carrying Value [1] 779  
Prepaid Expenses And Other Current Assets    
Derivative [Line Items]    
Fair Value— Assets 3,789 621
Prepaid Expenses And Other Current Assets | Designated as Hedging Instrument    
Derivative [Line Items]    
Fair Value— Assets 3,789 621
Prepaid Expenses And Other Current Assets | Designated as Hedging Instrument | Foreign Exchange Contract    
Derivative [Line Items]    
Fair Value— Assets [1] 3,010 621
Prepaid Expenses And Other Current Assets | Designated as Hedging Instrument | Interest rate contract    
Derivative [Line Items]    
Fair Value— Assets [1] 779  
Other Current Liabilities    
Derivative [Line Items]    
Fair Value— (Liabilities) 0 (1,047)
Other Current Liabilities | Designated as Hedging Instrument    
Derivative [Line Items]    
Fair Value— (Liabilities) 0 (1,047)
Other Current Liabilities | Designated as Hedging Instrument | Foreign Exchange Contract    
Derivative [Line Items]    
Fair Value— (Liabilities) [1] 0 $ (1,047)
Other Current Liabilities | Designated as Hedging Instrument | Interest rate contract    
Derivative [Line Items]    
Fair Value— (Liabilities) [1] $ 0  
[1] Assets are included in prepaid expenses and other and liabilities are included in other accrued expenses on the accompanying consolidated balance sheets.