Information Related to Effect of Derivative Instruments on Our Consolidated Condensed Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	$ (758)	$ 155	$ (1,243)	$ (1,538)
Other comprehensive income | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(571)		(411)
Other comprehensive income | Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	42	30	81	105
Revaluation of derivatives | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	557	581	398	(694)
Revaluation of derivatives | Currency Related Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(263)	(372)	(690)	1,887
Revaluation of derivatives | Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		8	(1)	8
Product Revenues | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(129)		(129)
Cost of sales | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	64		94
Selling, General and Administrative Expense | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(73)		(141)
Foreign currency gain (loss) | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	$ (606)	$ (426)	$ (1,054)	$ (844)