Information Related to Effect of Derivative Instruments on Our Consolidated Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	$ (2,090)	$ (2,051)
Revaluation Of Derivatives | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(1,329)	(3,926)
Revaluation Of Derivatives | Currency Related Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	2,335	1,491
Revaluation Of Derivatives | Commodity derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		143
Foreign Currency Gain (Loss) | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(761)	1,875
Interest Expense | Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	(2)	(57)
Other Comprehensive Income (Loss)
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	$ 143	$ (18)