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Derivative Financial Instruments - Additional Information (Detail) (USD $)
7 Months Ended 12 Months Ended
Jul. 31, 2014
Dec. 31, 2013
Aug. 01, 2014
Derivative [Line Items]      
Derivative financial instruments     $ 0us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Cash Flow Hedging [Member] | Interest Rate Hedges [Member]      
Derivative [Line Items]      
Hedge ineffectiveness 0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
0us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
 
Interest rate hedges designated and qualifying as cash flow hedges (200,000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
(72,000)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
 
Cash Flow Hedging [Member] | Interest Rate Hedges [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Interest rate hedges designated and qualifying as cash flow hedges $ 193,000us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
$ 74,000us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember