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Effect of Derivative Instruments on Consolidated Statements of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivative [Line Items]      
Amount of loss recognized in OCI on derivative (effective portion) $ 1,230us-gaap_DerivativeInstrumentsLossRecognizedInOtherComprehensiveIncomeEffectivePortion $ 188us-gaap_DerivativeInstrumentsLossRecognizedInOtherComprehensiveIncomeEffectivePortion $ 1,797us-gaap_DerivativeInstrumentsLossRecognizedInOtherComprehensiveIncomeEffectivePortion
Interest Rate Swap [Member] | Derivatives in Cash Flow Hedging Relationships | Interest Expense      
Derivative [Line Items]      
Amount of loss reclassified from accumulated OCI into income (effective portion) $ 1,776us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CashFlowHedgingMember
/ els_DerivativesByDerivativeInstrumentContractAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember		 $ 1,851us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CashFlowHedgingMember
/ els_DerivativesByDerivativeInstrumentContractAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember		 $ 1,754us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CashFlowHedgingMember
/ els_DerivativesByDerivativeInstrumentContractAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember