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Derivative Financial Instruments - Additional Information (Detail) (Foreign Exchange Forward And Option Contracts, Upper Limit)
 9 Months Ended
Sep. 30, 2014
General maturity
  
Derivative Instruments and Hedging Activities Disclosure [Line Items]  
Contract term 1 year
Extended maturity
  
Derivative Instruments and Hedging Activities Disclosure [Line Items]  
Contract term 5 years