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Net Income Per Common Share (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Basic [Abstract]    
Income from discontinued operations available to common stockholders $ 59,363,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity $ 21,912,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Income from discontinued operations available to common stockholders (in shares) 64,185,455ess_IncomeFromDiscontinuedOperationsWeightedAverageCommonSharesOutstandingDuringYear 37,685,073ess_IncomeFromDiscontinuedOperationsWeightedAverageCommonSharesOutstandingDuringYear
Income from discontinued operations available to common stockholders (in dollars per share) $ 0.92us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.58us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Effect of dilutive securities 0us-gaap_DilutiveSecurities 0us-gaap_DilutiveSecurities
Effect of dilutive securities (in shares) 209,225ess_WeightedAverageCommonsSharesEffectOfDilutiveSecurities 246,381ess_WeightedAverageCommonsSharesEffectOfDilutiveSecurities
Diluted [Abstract]    
Income from continuing operations available to common stockholders 59,363,000ess_IncomeFromContinuingOperationsAvailableToCommonStockholders1 21,912,000ess_IncomeFromContinuingOperationsAvailableToCommonStockholders1
Adjusted income from continuing operations available to common stockholders (in shares) 64,394,680ess_AdjustedIncomeFromContinuingOperationsAvailableToCommonStockholders 37,931,454ess_AdjustedIncomeFromContinuingOperationsAvailableToCommonStockholders
Adjusted income from continuing operations available to common stockholders (in dollars per share) $ 0.92ess_AdjustedIncomeFromContinuingOperationsAvailableToCommonStockholder $ 0.58ess_AdjustedIncomeFromContinuingOperationsAvailableToCommonStockholder
Essex Portfolio, L.P. [Member]    
Basic [Abstract]    
Income from discontinued operations available to common stockholders 61,474,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
23,329,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Income from discontinued operations available to common stockholders (in shares) 66,369,769ess_IncomeFromDiscontinuedOperationsWeightedAverageCommonSharesOutstandingDuringYear
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
39,957,252ess_IncomeFromDiscontinuedOperationsWeightedAverageCommonSharesOutstandingDuringYear
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Income from discontinued operations available to common stockholders (in dollars per share) $ 0.93us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
$ 0.58us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Effect of dilutive securities 0us-gaap_DilutiveSecurities
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
0us-gaap_DilutiveSecurities
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Effect of dilutive securities (in shares) 209,225ess_WeightedAverageCommonsSharesEffectOfDilutiveSecurities
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
246,381ess_WeightedAverageCommonsSharesEffectOfDilutiveSecurities
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Diluted [Abstract]    
Income from continuing operations available to common stockholders 61,474,000ess_IncomeFromContinuingOperationsAvailableToCommonStockholders1
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
23,329,000ess_IncomeFromContinuingOperationsAvailableToCommonStockholders1
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Adjusted income from continuing operations available to common stockholders (in shares) 66,578,994ess_AdjustedIncomeFromContinuingOperationsAvailableToCommonStockholders
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
40,203,633ess_AdjustedIncomeFromContinuingOperationsAvailableToCommonStockholders
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Adjusted income from continuing operations available to common stockholders (in dollars per share) $ 0.92ess_AdjustedIncomeFromContinuingOperationsAvailableToCommonStockholder
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
$ 0.58ess_AdjustedIncomeFromContinuingOperationsAvailableToCommonStockholder
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Convertible Limited Partnership Units [Member]    
Diluted [Abstract]    
Antidilutive securities excluded from computation of earnings per share, amount 2,184,314us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= ess_ConvertibleLimitedPartnershipUnitsMember
2,272,179us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= ess_ConvertibleLimitedPartnershipUnitsMember
Antidilutive securities excluded from computation of earnings per share, value $ 2,100,000ess_AntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareValue
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= ess_ConvertibleLimitedPartnershipUnitsMember
$ 1,400,000ess_AntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareValue
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= ess_ConvertibleLimitedPartnershipUnitsMember
Employee Stock Option [Member]    
Diluted [Abstract]    
Antidilutive securities excluded from computation of earnings per share, amount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
164,442us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
Employee Stock Option [Member] | Essex Portfolio, L.P. [Member]    
Diluted [Abstract]    
Antidilutive securities excluded from computation of earnings per share, amount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
164,442us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember