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Derivative Instruments - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Derivative notional amount $ 44,228,000invest_DerivativeNotionalAmount $ 51,623,000invest_DerivativeNotionalAmount
Derivative foreign currency exchange contracts settlement date 1 month  
Cash flow hedges [Member] | Interest rate contracts [Member]    
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Derivative notional amount $ 4,139,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 $ 0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember