Information Related to Effect of Derivative Instruments on Our Consolidated Condensed Income Statements (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	$ (254)	$ (428)	$ (485)	$ (1,693)
Other Comprehensive Income | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	99		160
Other Comprehensive Income | Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		36	39	75
Revaluation Of Derivatives | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(421)	(301)	(159)	(1,275)
Revaluation Of Derivatives | Currency Related Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	81	940	(428)	2,260
Cost of Sales | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	83		30
Selling, General and Administrative Expense | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(20)		(68)
Foreign Currency Gain (Loss) | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	5	(127)	(448)	(418)
Interest Expense | Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	$ (1)	$ 2	$ (1)	$ 2