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Derivatives - Summary of Gains (Losses) on Derivatives Not Designated as Hedging Instruments (Detail) (Derivatives Not Designated as Hedging Instruments [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivatives Not Designated as Hedging Instruments [Member]
      
Derivative Instruments, Gain (Loss) Not Designated as Hedging Instruments [Line Items]      
Net gain (loss) recognized in income $ 101us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 $ (215)us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 $ (1,606)us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember