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Computation of Basic and Diluted Earnings Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income from Continuing Operations:                      
Income from continuing operations-basic $ 34,262us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 30,276us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 30,040us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 43,890us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 28,713us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 34,936us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 21,786us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 40,470us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 138,468us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 77,247us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 63,747us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Net Income (Loss) Attributable to Noncontrolling Interest, Operating Partnerships (Deprecated 2013-01-31)                 (10,463)us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable (9,706)us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable (5,067)us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable
Net Income Available for Common Shares-Fully Diluted:                      
Net income available for Common Shares-basic                 118,731us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 106,919us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 54,779us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Amounts allocated to dilutive securities                 10,463els_IncrementalIncomeLossRelatedToPotentialCommonShares 9,706els_IncrementalIncomeLossRelatedToPotentialCommonShares 5,067els_IncrementalIncomeLossRelatedToPotentialCommonShares
Net income available for Common Shares-fully diluted                 129,194us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted 116,625us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted 59,846us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent                 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 44,569us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 9,818us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Redeemable Preferred Stock Dividends                 (9,274)us-gaap_RedeemablePreferredStockDividends (9,280)us-gaap_RedeemablePreferredStockDividends (14,613)us-gaap_RedeemablePreferredStockDividends
Denominator:                      
Weighted average Common Shares outstanding-basic 83,562us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 83,531us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 83,234us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 83,116us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 83,003us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 83,021us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 83,021us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 83,026us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 83,362us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 83,018us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 82,348us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:                      
Redemption of Common OP Units for Common Shares                 7,411els_IncrementalCommonSharesAttributableToRedemptionOrExchangeOfNoncontrollingInterests 7,549els_IncrementalCommonSharesAttributableToRedemptionOrExchangeOfNoncontrollingInterests 7,877els_IncrementalCommonSharesAttributableToRedemptionOrExchangeOfNoncontrollingInterests
Employee stock options and restricted shares                 738us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 629us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 637us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average Common Shares outstanding-fully diluted 91,644us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 91,528us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 91,420us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 91,353us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 91,334us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 91,259us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 91,128us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 91,060us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 91,511us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 91,196us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 90,862us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Income (Loss) from Continuing Operations, Per Basic Share                 $ 1.42us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.75us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.55us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share                 $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.54us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.12us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net income available for Common Shares $ 0.35us-gaap_EarningsPerShareBasic $ 0.31us-gaap_EarningsPerShareBasic $ 0.31us-gaap_EarningsPerShareBasic $ 0.46us-gaap_EarningsPerShareBasic $ 0.29us-gaap_EarningsPerShareBasic $ 0.36us-gaap_EarningsPerShareBasic $ 0.22us-gaap_EarningsPerShareBasic $ 0.42us-gaap_EarningsPerShareBasic $ 1.42us-gaap_EarningsPerShareBasic $ 1.29us-gaap_EarningsPerShareBasic $ 0.67us-gaap_EarningsPerShareBasic
Income (Loss) from Continuing Operations, Per Diluted Share                 $ 1.41us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.75us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.54us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Net income available for Common Shares $ 0.35us-gaap_EarningsPerShareDiluted $ 0.31us-gaap_EarningsPerShareDiluted $ 0.30us-gaap_EarningsPerShareDiluted $ 0.46us-gaap_EarningsPerShareDiluted $ 0.29us-gaap_EarningsPerShareDiluted $ 0.36us-gaap_EarningsPerShareDiluted $ 0.21us-gaap_EarningsPerShareDiluted $ 0.42us-gaap_EarningsPerShareDiluted $ 1.41us-gaap_EarningsPerShareDiluted $ 1.28us-gaap_EarningsPerShareDiluted $ 0.66us-gaap_EarningsPerShareDiluted
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share                 $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.53us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.12us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Continuing Operations [Member]                      
Income from Continuing Operations:                      
Net Income (Loss) Attributable to Noncontrolling Interest, Operating Partnerships (Deprecated 2013-01-31)                 (10,463)us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 (5,617)us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 (4,173)us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Net Income Available for Common Shares-Fully Diluted:                      
Net income available for Common Shares-basic                 118,731us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 62,350us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 44,961us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Amounts allocated to dilutive securities                 10,463els_IncrementalIncomeLossRelatedToPotentialCommonShares
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 5,617els_IncrementalIncomeLossRelatedToPotentialCommonShares
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 4,173els_IncrementalIncomeLossRelatedToPotentialCommonShares
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Net income available for Common Shares-fully diluted                 129,194us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 67,967us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 49,134us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Cumulative Series C Six Point Seven Five Percent Redeemable Perpetual Preferred Stock [Member]                      
Net Income Available for Common Shares-Fully Diluted:                      
Redeemable Preferred Stock Dividends                 $ (9,274)us-gaap_RedeemablePreferredStockDividends
/ us-gaap_StatementClassOfStockAxis
= els_CumulativeSeriesCSixPointSevenFivePercentRedeemablePerpetualPreferredStockMember		 $ (9,280)us-gaap_RedeemablePreferredStockDividends
/ us-gaap_StatementClassOfStockAxis
= els_CumulativeSeriesCSixPointSevenFivePercentRedeemablePerpetualPreferredStockMember		 $ (2,909)us-gaap_RedeemablePreferredStockDividends
/ us-gaap_StatementClassOfStockAxis
= els_CumulativeSeriesCSixPointSevenFivePercentRedeemablePerpetualPreferredStockMember