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Equity Incentive Awards - Additional Information (Detail) (USD $)
3 Months Ended 0 Months Ended
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