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Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Forward exchange contracts, assets $ 1,240us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue $ 1,966us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue
Forward exchange contracts, liabilities (318)us-gaap_ForeignCurrencyCashFlowHedgeLiabilityAtFairValue  
Total net derivative asset designated as hedging instruments 922us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet 1,966us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet
Derivatives Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Forward exchange contracts, assets 1,240us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
1,966us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Forward exchange contracts, liabilities (318)us-gaap_ForeignCurrencyCashFlowHedgeLiabilityAtFairValue
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Total net derivative asset designated as hedging instruments $ 922us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
$ 1,966us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember