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Long-Term Cash Incentive Plan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |
Document Period End Date | Mar. 31, 2013
Accrued compensation expense | $ 0.5
Long Term Incentive Plan Twenty Thirteen [Member] |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |
Estimated Payments For Employee Long Term Incentive Plan | $ 5.8

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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Namespace Prefix: | dei_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Estimated payout of the LTIP plan. + References No definition available. + Details
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Namespace Prefix: | els_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant