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Derivative Instruments - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments And Hedging Activities Disclosures [Line Items]    
Derivative notional amount $ 51,623,000invest_DerivativeNotionalAmount $ 20,289,000invest_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 $ 0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 $ 2,268,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember