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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
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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 | $ 34,262 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 30,276 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 30,040 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 43,890 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 28,713 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 34,936 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 21,786 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 40,470 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 138,468 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 77,247 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 63,747 us-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 |  |  |  |  |  |  |  |  | 118,731 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 106,919 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 54,779 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Amounts allocated to dilutive securities |  |  |  |  |  |  |  |  | 10,463 els_IncrementalIncomeLossRelatedToPotentialCommonShares | 9,706 els_IncrementalIncomeLossRelatedToPotentialCommonShares | 5,067 els_IncrementalIncomeLossRelatedToPotentialCommonShares
Net income available for Common Shares-fully diluted |  |  |  |  |  |  |  |  | 129,194 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 116,625 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 59,846 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 44,569 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 9,818 us-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 | 83,562 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 83,531 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 83,234 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 83,116 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 83,003 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 83,021 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 83,021 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 83,026 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 83,362 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 83,018 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 82,348 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Redemption of Common OP Units for Common Shares |  |  |  |  |  |  |  |  | 7,411 els_IncrementalCommonSharesAttributableToRedemptionOrExchangeOfNoncontrollingInterests | 7,549 els_IncrementalCommonSharesAttributableToRedemptionOrExchangeOfNoncontrollingInterests | 7,877 els_IncrementalCommonSharesAttributableToRedemptionOrExchangeOfNoncontrollingInterests
Employee stock options and restricted shares |  |  |  |  |  |  |  |  | 738 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 629 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 637 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average Common Shares outstanding-fully diluted | 91,644 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 91,528 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 91,420 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 91,353 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 91,334 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 91,259 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 91,128 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 91,060 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 91,511 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 91,196 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 90,862 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Income (Loss) from Continuing Operations, Per Basic Share |  |  |  |  |  |  |  |  | $ 1.42 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.75 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.55 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share |  |  |  |  |  |  |  |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.54 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.12 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net income available for Common Shares | $ 0.35 us-gaap_EarningsPerShareBasic | $ 0.31 us-gaap_EarningsPerShareBasic | $ 0.31 us-gaap_EarningsPerShareBasic | $ 0.46 us-gaap_EarningsPerShareBasic | $ 0.29 us-gaap_EarningsPerShareBasic | $ 0.36 us-gaap_EarningsPerShareBasic | $ 0.22 us-gaap_EarningsPerShareBasic | $ 0.42 us-gaap_EarningsPerShareBasic | $ 1.42 us-gaap_EarningsPerShareBasic | $ 1.29 us-gaap_EarningsPerShareBasic | $ 0.67 us-gaap_EarningsPerShareBasic
Income (Loss) from Continuing Operations, Per Diluted Share |  |  |  |  |  |  |  |  | $ 1.41 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.75 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.54 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Net income available for Common Shares | $ 0.35 us-gaap_EarningsPerShareDiluted | $ 0.31 us-gaap_EarningsPerShareDiluted | $ 0.30 us-gaap_EarningsPerShareDiluted | $ 0.46 us-gaap_EarningsPerShareDiluted | $ 0.29 us-gaap_EarningsPerShareDiluted | $ 0.36 us-gaap_EarningsPerShareDiluted | $ 0.21 us-gaap_EarningsPerShareDiluted | $ 0.42 us-gaap_EarningsPerShareDiluted | $ 1.41 us-gaap_EarningsPerShareDiluted | $ 1.28 us-gaap_EarningsPerShareDiluted | $ 0.66 us-gaap_EarningsPerShareDiluted
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share |  |  |  |  |  |  |  |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.53 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.12 us-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 |  |  |  |  |  |  |  |  | 118,731 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 62,350 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 44,961 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Amounts allocated to dilutive securities |  |  |  |  |  |  |  |  | 10,463 els_IncrementalIncomeLossRelatedToPotentialCommonShares / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 5,617 els_IncrementalIncomeLossRelatedToPotentialCommonShares / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 4,173 els_IncrementalIncomeLossRelatedToPotentialCommonShares / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Net income available for Common Shares-fully diluted |  |  |  |  |  |  |  |  | 129,194 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 67,967 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 49,134 us-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

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