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Derivative Instruments - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Derivatives, Fair Value [Line Items]  
Net amount of existing gains and losses $ 111,000
Economic Hedge Forward Contracts [Member]
  
Derivatives, Fair Value [Line Items]  
Derivative instruments maturity period 45 days
Number of derivative instruments to manage foreign currency risk 2
Cash Flow Hedge Forward Contracts [Member]
  
Derivatives, Fair Value [Line Items]  
Derivative instruments maturity period 18 months