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Common Stock and Other Equity Related Transactions - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Sep. 14, 2012
Sep. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Aug. 09, 2012
Nov. 25, 2011
Class of Stock [Line Items]                
Stock Issued During Period, Shares, Restricted Stock Award, Gross     186,666us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross 173,332us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross 214,664us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross      
Common Stock, Par or Stated Value Per Share     $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare        
Stockholders' Equity Note, Stock Split  
Each common shareholder of record on July 5, 2013, received one additional share of common stock for each share held.
            
At The Market Offering Value           $ 125,000,000els_AtMarketOfferingValue    
Temporary Equity, Shares Outstanding             8,000,000us-gaap_TemporaryEquitySharesOutstanding  
Preferred Stock, Shares Authorized     9,765,900us-gaap_PreferredStockSharesAuthorized 9,765,525us-gaap_PreferredStockSharesAuthorized        
Peferred Stock, Shares Exchanged 5,445,765els_PeferredStockSharesExchanged              
Depositary Shares, Issued 5,445,765els_DepositarySharesIssued              
Employee Stock Purchase Plan Purchase Price Of Shares    
The common stock may be purchased monthly at a price equal to 85% of the lesser of: (a) the closing price for a share of common stock on the last day of the offering period; and (b) the closing price for a share of common stock on the first day of the offering period.
         
Common stock issued through the employee stock purchase plan     30,739us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 18,411us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 30,154us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans      
Common Stock, Shares Authorized     200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized       100,000,000us-gaap_CommonStockSharesAuthorized
Non-Controlling Interests - Common OP Units     7,231,967us-gaap_UnitsOfPartnershipInterestAmount 7,667,723us-gaap_UnitsOfPartnershipInterestAmount 7,456,320us-gaap_UnitsOfPartnershipInterestAmount      
Share Based Compensation Arrangement By Share Based Payment Award Repurchased Shares For Taxes     $ 51.62els_ShareBasedCompensationArrangementByShareBasedPaymentAwardRepurchasedSharesForTaxes $ 36.48els_ShareBasedCompensationArrangementByShareBasedPaymentAwardRepurchasedSharesForTaxes $ 33.31els_ShareBasedCompensationArrangementByShareBasedPaymentAwardRepurchasedSharesForTaxes      
Percentage ownership of the Operating Partnership     92.10%els_PercentageOfOwnershipInterests 91.60%els_PercentageOfOwnershipInterests        
Percentage ownership of the Operating Partnership by the Common OP Unitholders     7.90%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners 8.40%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners        
Number of acquired site property         1,765els_NumberOfAcquiredSites      
Depositary Share, Liquidation Preference Per Share $ 25.00els_DepositaryShareLiquidationPreferencePerShare              
Preferred Stock, Dividend Rate, Per-Dollar-Amount $ 0.3849625us-gaap_PreferredStockDividendRatePerDollarAmount              
Maximum                
Class of Stock [Line Items]                
Stock purchases under employee stock purchase plan     $ 250,000els_EmployeeStockPurchaseProgramAuthorizedAmount
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		          
Number Of Shares Authorized Employee Stock Purchase Plan     2,000,000els_NumberOfSharesAuthorizedEmployeeStockPurchasePlan
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		          
Employee Stock Purchase Plan [Member]                
Class of Stock [Line Items]                
Employee stock purchase plan amendement date     May 3, 2006