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Derivative Instruments Which were Not Designated as Hedging Instruments (Detail) (Foreign currency contracts [Member], Other (income) expense, net [Member], Fair Value of Derivatives Not Designated as Hedging Instrument [Member], USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Foreign currency contracts [Member] | Other (income) expense, net [Member] | Fair Value of Derivatives Not Designated as Hedging Instrument [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of (Loss) Gain Recognized in Income on Derivative $ (1,073) $ 4,720 $ 5,010 $ (10,130)