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Information Related to Effect of Derivative Instruments on Our Consolidated Condensed Income Statements (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives $ (29) $ (1,265)
Revaluation Of Derivatives | Foreign Currency Derivatives
    
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives 262 (974)
Revaluation Of Derivatives | Currency Related Swap
    
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives (509) 1,320
Cost of Sales | Foreign Currency Derivatives
    
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives 53  
Selling General And Administrative | Foreign Currency Derivatives
    
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives 48  
Other Comprehensive Income (Loss) | Foreign Currency Derivatives
    
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives 61  
Other Comprehensive Income (Loss) | Interest Rate Swap
    
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives 39 39
Foreign Currency Gain (Loss) | Foreign Currency Derivatives
    
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives (453) (291)
Interest Expense | Interest Rate Swap
    
Derivative Instruments Gain Loss [Line Items]    
Gain (loss) on derivatives   $ (1)