Financial Instruments - Effect on Derivative Instruments on Consolidated Financial Performance (Detail) (Foreign Currency Forward Contracts [Member], Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in Earnings	$ 1,300		$ 4,000
Foreign Currency (Loss) Gain [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in Earnings	$ (2,652)	$ (4,148)	$ (6,652)	$ 5,385