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Information Related to Effect of Derivative Instruments on Our Consolidated Condensed Statements of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives $ 2,215 $ 1,545
Commodity Derivatives    
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives 51 85
Other comprehensive income | Foreign Currency Derivatives    
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives 2,960 1,293
Other comprehensive income | Commodity Derivatives    
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives 32 296
Cost of sales | Foreign Currency Derivatives    
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives (472) 35
Cost of sales | Commodity Derivatives    
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives 19 (211)
Selling, general and administrative expense | Foreign Currency Derivatives    
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives (216) 139
Foreign currency (loss) gain | Foreign Currency Derivatives    
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives $ (57) $ 78