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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on derivatives $ 1,146 $ (878) $ 3,361 $ 667
Commodity Derivatives        
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on derivatives 26 (33) 77 52
Other comprehensive income | Foreign Currency Derivatives        
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on derivatives 815 (1,049) 3,775 244
Other comprehensive income | Commodity Derivatives        
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on derivatives 16 109 48 405
Cost of sales | Foreign Currency Derivatives        
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on derivatives 351 100 (121) 135
Cost of sales | Commodity Derivatives        
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on derivatives 10 (142) 29 (353)
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 $ (20) $ 71 $ (77) $ 149