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Derivative Instruments and Risk Management - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Derivative [Line Items]  
Maturity period of foreign currency forward exchange contracts 18 months
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Exchange Contracts [Member] | Other Income/(Expense) [Member]
 
Derivative [Line Items]  
Amount of Gain Recognized in Income $ 2.0