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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on derivatives $ (878) $ (434) $ 667 $ 5,516
Commodity Derivatives        
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on derivatives (33) (124) 52 (48)
Other Comprehensive Income (Loss) | Foreign Currency Derivatives        
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on derivatives (1,049) (430) 244 (777)
Other Comprehensive Income (Loss) | Commodity Derivatives        
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on derivatives 109 (124) 405 (48)
Revaluation of Derivatives | Foreign Currency Derivatives        
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on derivatives   81   6,278
Revaluation of Derivatives | Currency Related Interest Rate Swap        
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on derivatives   (134)   (7,295)
Cost of Sales | Foreign Currency Derivatives        
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on derivatives 100 (192) 135 (320)
Cost of Sales | Commodity Derivatives        
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on derivatives (142)   (353)  
Selling, general and administrative expense | Foreign Currency Derivatives        
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on derivatives   25 139 46
Foreign Currency (Loss) Gain | Foreign Currency Derivatives        
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on derivatives $ 71 $ 82 $ 149 $ 289