Mark-to-Market Impact on Earnings Resulting from Hedging Activities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Average rate currency options and forward contracts | Other income (loss), net
Derivative Instruments Gain Loss [Line Items]
Derivative instruments gain (loss) recognized in income	$ (26)	$ (123)	$ (136)	$ (123)
Interest Rate Swap | Interest income (expense)
Derivative Instruments Gain Loss [Line Items]
Derivative instruments gain (loss) recognized in income	$ (157)	$ 18	$ (158)	$ 30