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Equity Incentive Awards - Additional Information (Detail) (USD $) | 3 Months Ended | 0 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Feb. 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation | $ 1,716,000us-gaap_ShareBasedCompensation | $ 733,000us-gaap_ShareBasedCompensation |
Number of shares available for grant | 3,438,234us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |
Management |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights |  |  | Full
Director |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights |  |  | One-third
Restricted Stock | Management |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity instruments other than options, grants in period |  |  | 78,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / els_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_ManagementMember
Fair value of shares issued |  |  | 4,300,000us-gaap_DeferredCompensationArrangementWithIndividualFairValueOfSharesIssued / els_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_ManagementMember
Equity instruments other than options vesting date |  |  | Dec. 31, 2015
Restricted Stock | Director |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity instruments other than options, grants in period |  |  | 47,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / els_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember
Fair value of shares issued |  |  | 2,600,000us-gaap_DeferredCompensationArrangementWithIndividualFairValueOfSharesIssued / els_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember
Restricted Stock | Director | Phase One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity instruments other than options vesting date |  |  | Dec. 31, 2015
Restricted Stock | Director | Phase Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity instruments other than options vesting date |  |  | Dec. 31, 2016
Restricted Stock | Director | Phase Three |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity instruments other than options vesting date |  |  | Dec. 31, 2017
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized for issuance | 3,750,000us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Definition Description of the period of time over which a director's right to exercise an award is no longer contingent on the passage of time, which may be expressed in a variety of ways (for example, in years, month and year). + References No definition available. + Details
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- Definition The total fair value of shares issued during the period under a deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares authorized for issuance under the deferred compensation arrangement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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