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Savings Plan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Savings Plan, 401(k) Disclosure [Line Items] |  |  |
Employees eligible compensation deferral for 401(k) Plan | 60.00%els_DeferredCompensationArrangementWithIndividualContributionsByPlanParticipantsPercentageOfSalaryMaximum |  |
401(k) Plan, employer matching percentage for the first 3% of participants' contribution | 100.00%els_InitialEmployerFourZeroOneKMatchingContributionToEmployee |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 3.00%els_EmployerFourZeroOneKOneHundredPercentMatchingofEmployeeContribution |  |
401(k) Plan, employer matching percentage for the second 2% of participants' contribution | 50.00%els_EmployerFourZeroOneKMatchingContributionToEmployee |  |
Employer 401K, Employee Contribution matched 50 percent by Employer | 2.00%els_EmployerFourZeroOneKFiftyPercentMatchingofEmployeeContribution |  |
Employer 401 K Matching Contribution To Employee Maximum | 4.00%els_EmployerFourZeroOneKMatchingContributionToEmployeeMaximum |  |
Vested percentage for amounts contributed by the Company, after five years of employment | 100.00%els_DeferredCompensationArrangementWithIndividualPercentageVested |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 1.3 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 1.3 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 1.3 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount

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- Definition Deferred Compensation Arrangement with Individual, Contributions by Plan Participants, Percentage of Salary, Maximum + References No definition available. + Details
Name: | els_DeferredCompensationArrangementWithIndividualContributionsByPlanParticipantsPercentageOfSalaryMaximum
Namespace Prefix: | els_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Deferred Compensation Arrangement with Individual, Percentage Vested + References No definition available. + Details
Name: | els_DeferredCompensationArrangementWithIndividualPercentageVested
Namespace Prefix: | els_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Employer matching contribution of fifty percent of the employee contribution. + References No definition available. + Details
Name: | els_EmployerFourZeroOneKFiftyPercentMatchingofEmployeeContribution
Namespace Prefix: | els_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Additional level of matching contribution by employer for employee retirement plan. + References No definition available. + Details
Name: | els_EmployerFourZeroOneKMatchingContributionToEmployee
Namespace Prefix: | els_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The maximum matching contribution by employer for employee retirement plan. + References No definition available. + Details
Name: | els_EmployerFourZeroOneKMatchingContributionToEmployeeMaximum
Namespace Prefix: | els_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Employer matching contribution of one hundred percent of the employee contribution. + References No definition available. + Details
Name: | els_EmployerFourZeroOneKOneHundredPercentMatchingofEmployeeContribution
Namespace Prefix: | els_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Initial matching contribution by employer for employee retirement plan. + References No definition available. + Details
Name: | els_InitialEmployerFourZeroOneKMatchingContributionToEmployee
Namespace Prefix: | els_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | els_SavingsPlan401KDisclosureLineItems
Namespace Prefix: | els_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration