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Fair Value Measurements - Foreign Currency Exchange Contracts Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, Foreign currency exchange contracts, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency derivative instruments—asset position $ 40us-gaap_DerivativeAssets $ 557us-gaap_DerivativeAssets
Foreign currency derivative instruments—liability position (246)us-gaap_DerivativeLiabilities (823)us-gaap_DerivativeLiabilities
Total foreign currency derivative instruments (206)us-gaap_DerivativeFairValueOfDerivativeNet (266)us-gaap_DerivativeFairValueOfDerivativeNet
Observable market based inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency derivative instruments—asset position 40us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
557us-gaap_DerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Foreign currency derivative instruments—liability position (246)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
(823)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Total foreign currency derivative instruments $ (206)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
$ (266)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember