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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 |  |  | 186,666 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross | 173,332 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross | 214,664 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross |  |  |
Common Stock, Par or Stated Value Per Share |  |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-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 |  |  |  |  |  | $ 125,000,000 els_AtMarketOfferingValue |  |
Temporary Equity, Shares Outstanding |  |  |  |  |  |  | 8,000,000 us-gaap_TemporaryEquitySharesOutstanding |
Preferred Stock, Shares Authorized |  |  | 9,765,900 us-gaap_PreferredStockSharesAuthorized | 9,765,525 us-gaap_PreferredStockSharesAuthorized |  |  |  |
Peferred Stock, Shares Exchanged | 5,445,765 els_PeferredStockSharesExchanged |  |  |  |  |  |  |
Depositary Shares, Issued | 5,445,765 els_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 |  |  | 30,739 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 18,411 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 30,154 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans |  |  |
Common Stock, Shares Authorized |  |  | 200,000,000 us-gaap_CommonStockSharesAuthorized | 200,000,000 us-gaap_CommonStockSharesAuthorized |  |  |  | 100,000,000 us-gaap_CommonStockSharesAuthorized
Non-Controlling Interests - Common OP Units |  |  | 7,231,967 us-gaap_UnitsOfPartnershipInterestAmount | 7,667,723 us-gaap_UnitsOfPartnershipInterestAmount | 7,456,320 us-gaap_UnitsOfPartnershipInterestAmount |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Repurchased Shares For Taxes |  |  | $ 51.62 els_ShareBasedCompensationArrangementByShareBasedPaymentAwardRepurchasedSharesForTaxes | $ 36.48 els_ShareBasedCompensationArrangementByShareBasedPaymentAwardRepurchasedSharesForTaxes | $ 33.31 els_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 |  |  |  |  | 1,765 els_NumberOfAcquiredSites |  |  |
Depositary Share, Liquidation Preference Per Share | $ 25.00 els_DepositaryShareLiquidationPreferencePerShare |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount | $ 0.3849625 us-gaap_PreferredStockDividendRatePerDollarAmount |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock purchases under employee stock purchase plan |  |  | $ 250,000 els_EmployeeStockPurchaseProgramAuthorizedAmount / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
Number Of Shares Authorized Employee Stock Purchase Plan |  |  | 2,000,000 els_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 |  |  |  |  |

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- Definition The value of an offering program (at the market, "ATM) that provides a potentially efficient means of raising measured amounts of equity capital over time by allowing a company to tap into the existing secondary market for its shares on an as-and-when-needed basis. + References No definition available. + Details
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- Definition The per share liquidation preference (or restrictions) of depositary shares that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References No definition available. + Details
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