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Financial Derivatives and Hedging Activities - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013
Not Designated as Hedging [Member]
Derivative [Line Items]
Maturities of foreign currency derivative contracts not designated as hedging instruments	1 month
Designated as Hedging [Member]
Derivative [Line Items]
Maximum maturity period of foreign currency derivative contracts designated as hedging instruments	12 months
Fair Value, Measurements [Member]
Derivative [Line Items]
Accumulated other comprehensive income realization period	12 months