Income Statement Location and Impact of Derivative Financial Instruments (Detail) (Derivatives Not Designated As Hedging Instruments, Foreign exchange contract, USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Derivatives Not Designated As Hedging Instruments | Foreign exchange contract
Derivative Instruments, Gain (Loss) [Line Items]
Currency exchange losses, net	$ 233	$ (364)