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Financial Instruments and Risk Management (Fair Values of Derivative Instruments) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Fair value of assets and liabilities $ (24,224) $ 20,713
Other current assets    
Derivatives, Fair Value [Line Items]    
Total derivative assets 1,448 21,092
Other current assets | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total derivative assets 907 16,729
Other current assets | Non-hedges    
Derivatives, Fair Value [Line Items]    
Total derivative assets 541 4,363
Accrued liabilities    
Derivatives, Fair Value [Line Items]    
Total derivative liabilities 25,672 379
Accrued liabilities | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total derivative liabilities 21,169 207
Accrued liabilities | Non-hedges    
Derivatives, Fair Value [Line Items]    
Total derivative liabilities $ 4,503 $ 172