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Derivative Financial Instruments - Income Statement Location and Impact of Derivative Financial Instruments (Detail) (Not Designated as Hedging Instrument, Foreign exchange contract, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Not Designated as Hedging Instrument | Foreign exchange contract
   
Derivative Instruments, Gain (Loss) [Line Items]    
Currency exchange losses, net $ 2,268us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
$ 805us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember