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Consolidated Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Rental properties:        
Land and land improvements $ 2,426,496,000us-gaap_LandAndLandImprovements $ 1,083,552,000us-gaap_LandAndLandImprovements    
Buildings and improvements 8,826,015,000us-gaap_InvestmentBuildingAndBuildingImprovements 4,360,205,000us-gaap_InvestmentBuildingAndBuildingImprovements    
Total Rental Properties 11,252,511,000us-gaap_RealEstateInvestmentPropertyAtCost 5,443,757,000us-gaap_RealEstateInvestmentPropertyAtCost    
Less: accumulated depreciation (1,564,806,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation (1,254,886,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation    
Net Real Estate 9,687,705,000us-gaap_RealEstateInvestmentPropertyNet 4,188,871,000us-gaap_RealEstateInvestmentPropertyNet    
Real estate under development 434,371,000us-gaap_DevelopmentInProcess 50,430,000us-gaap_DevelopmentInProcess    
Co-investments 1,036,411,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures 677,133,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures    
Real estate held for sale, net 56,300,000us-gaap_RealEstateHeldforsale 0us-gaap_RealEstateHeldforsale    
Total Real Estate 11,214,787,000ess_TotalRealEstateNet 4,916,434,000ess_TotalRealEstateNet    
Cash and cash equivalents-unrestricted 25,281,000us-gaap_CashAndCashEquivalentsAtCarryingValue 18,491,000us-gaap_CashAndCashEquivalentsAtCarryingValue 18,606,000us-gaap_CashAndCashEquivalentsAtCarryingValue 12,889,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents-restricted 70,139,000us-gaap_RestrictedCashAndCashEquivalents 35,275,000us-gaap_RestrictedCashAndCashEquivalents    
Marketable securities and other investments 117,240,000us-gaap_AvailableForSaleSecurities 90,084,000us-gaap_AvailableForSaleSecurities    
Notes and other receivables 24,923,000us-gaap_NotesReceivableNet 68,255,000us-gaap_NotesReceivableNet    
Prepaid expenses and other assets 33,318,000us-gaap_PrepaidExpenseAndOtherAssets 29,268,000us-gaap_PrepaidExpenseAndOtherAssets    
Acquired in-place lease value 47,747,000us-gaap_FiniteLivedIntangibleAssetsNet 4,513,000us-gaap_FiniteLivedIntangibleAssetsNet    
Deferred charges, net 29,439,000us-gaap_DeferredFinanceCostsNet 24,519,000us-gaap_DeferredFinanceCostsNet    
Total assets 11,562,874,000us-gaap_Assets 5,186,839,000us-gaap_Assets    
Liabilities:        
Mortgage notes payable 2,245,944,000us-gaap_SecuredDebt 1,404,080,000us-gaap_SecuredDebt    
Unsecured debt 2,617,482,000us-gaap_UnsecuredDebt 1,410,023,000us-gaap_UnsecuredDebt    
Lines of credit 246,391,000us-gaap_LineOfCredit 219,421,000us-gaap_LineOfCredit    
Accounts payable and accrued liabilities 142,135,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent 67,183,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent    
Construction payable 30,892,000us-gaap_ConstructionPayableCurrentAndNoncurrent 8,047,000us-gaap_ConstructionPayableCurrentAndNoncurrent    
Dividends payable 88,221,000us-gaap_DividendsPayableCurrentAndNoncurrent 50,627,000us-gaap_DividendsPayableCurrentAndNoncurrent    
Other liabilities 32,485,000us-gaap_OtherLiabilities 24,871,000us-gaap_OtherLiabilities    
Total liabilities 5,403,550,000us-gaap_Liabilities 3,184,252,000us-gaap_Liabilities    
Temporary Equity [Abstract]        
Commitments and contingencies          
Redeemable noncontrolling interest 23,256,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount 0us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount    
Cumulative convertible 4.875% Series G preferred stock; $.0001 par value: 5,980,000 issued, and 0 and 178,249 outstanding 0us-gaap_TemporaryEquityCarryingAmountAttributableToParent 4,349,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent    
Equity:        
Common stock; $.0001 par value, 656,020,000 shares authorized; 63,682,646 and 37,421,219 shares issued and outstanding, respectively 6,000us-gaap_CommonStockValue 4,000us-gaap_CommonStockValue    
Cumulative redeemable 7.125% Series H preferred stock at liquidation value 73,750,000us-gaap_PreferredStockValue 73,750,000us-gaap_PreferredStockValue    
Excess stock; $.0001 par value, 330,000,000 shares authorized and no shares issued or outstanding 0ess_ExcessStockValue 0ess_ExcessStockValue    
Additional paid-in capital 6,651,165,000us-gaap_AdditionalPaidInCapital 2,345,763,000us-gaap_AdditionalPaidInCapital    
Distributions in excess of accumulated earnings (650,797,000)ess_DistributionsInExcessOfAccumulatedEarnings (474,426,000)ess_DistributionsInExcessOfAccumulatedEarnings    
Accumulated other comprehensive loss, net (51,452,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (60,472,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax    
Total stockholders' equity 6,022,672,000us-gaap_StockholdersEquity 1,884,619,000us-gaap_StockholdersEquity    
Noncontrolling interest 113,396,000us-gaap_MinorityInterest 113,619,000us-gaap_MinorityInterest    
Total equity 6,136,068,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 1,998,238,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 1,880,116,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 1,553,728,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and equity/capital 11,562,874,000us-gaap_LiabilitiesAndStockholdersEquity 5,186,839,000us-gaap_LiabilitiesAndStockholdersEquity    
Essex Portfolio, L.P. [Member]        
Rental properties:        
Land and land improvements 2,426,496,000us-gaap_LandAndLandImprovements
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,083,552,000us-gaap_LandAndLandImprovements
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Buildings and improvements 8,826,015,000us-gaap_InvestmentBuildingAndBuildingImprovements
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
4,360,205,000us-gaap_InvestmentBuildingAndBuildingImprovements
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Total Rental Properties 11,252,511,000us-gaap_RealEstateInvestmentPropertyAtCost
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
5,443,757,000us-gaap_RealEstateInvestmentPropertyAtCost
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Less: accumulated depreciation (1,564,806,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(1,254,886,000)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Net Real Estate 9,687,705,000us-gaap_RealEstateInvestmentPropertyNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
4,188,871,000us-gaap_RealEstateInvestmentPropertyNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Real estate under development 434,371,000us-gaap_DevelopmentInProcess
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
50,430,000us-gaap_DevelopmentInProcess
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Co-investments 1,036,411,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
677,133,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Real estate held for sale, net 56,300,000us-gaap_RealEstateHeldforsale
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
0us-gaap_RealEstateHeldforsale
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Total Real Estate 11,214,787,000ess_TotalRealEstateNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
4,916,434,000ess_TotalRealEstateNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Cash and cash equivalents-unrestricted 25,281,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
18,491,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
18,606,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
12,889,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Cash and cash equivalents-restricted 70,139,000us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
35,275,000us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Marketable securities and other investments 117,240,000us-gaap_AvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
90,084,000us-gaap_AvailableForSaleSecurities
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Notes and other receivables 24,923,000us-gaap_NotesReceivableNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
68,255,000us-gaap_NotesReceivableNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Prepaid expenses and other assets 33,318,000us-gaap_PrepaidExpenseAndOtherAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
29,268,000us-gaap_PrepaidExpenseAndOtherAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Acquired in-place lease value 47,747,000us-gaap_FiniteLivedIntangibleAssetsNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
4,513,000us-gaap_FiniteLivedIntangibleAssetsNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Deferred charges, net 29,439,000us-gaap_DeferredFinanceCostsNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
24,519,000us-gaap_DeferredFinanceCostsNet
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Total assets 11,562,874,000us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
5,186,839,000us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Liabilities:        
Mortgage notes payable 2,245,944,000us-gaap_SecuredDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,404,080,000us-gaap_SecuredDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Unsecured debt 2,617,482,000us-gaap_UnsecuredDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,410,023,000us-gaap_UnsecuredDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Lines of credit 246,391,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
219,421,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Accounts payable and accrued liabilities 142,135,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
67,183,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Construction payable 30,892,000us-gaap_ConstructionPayableCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
8,047,000us-gaap_ConstructionPayableCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Distributions payable 88,221,000ess_DistributionsPayable
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
50,627,000ess_DistributionsPayable
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Other liabilities 32,485,000us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
24,871,000us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Total liabilities 5,403,550,000us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
3,184,252,000us-gaap_Liabilities
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Temporary Equity [Abstract]        
Commitments and contingencies          
Redeemable noncontrolling interest 23,256,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
0us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Cumulative convertible Series G 4.875% preferred interest (liquidation value of $4,456 at December 31, 2013) 0us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
4,349,000us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Equity:        
Common equity (2,201,810 and 2,149,802 units issued and outstanding, respectively) 48,665,000us-gaap_LimitedPartnersCapitalAccount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
45,957,000us-gaap_LimitedPartnersCapitalAccount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Accumulated other comprehensive loss, net (49,356,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(58,940,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Partners' Capital 6,073,433,000us-gaap_PartnersCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,932,108,000us-gaap_PartnersCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Noncontrolling interest 62,635,000us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
66,130,000us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Total Capital 6,136,068,000us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,998,238,000us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,880,116,000us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,553,728,000us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Total liabilities and equity/capital 11,562,874,000us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
5,186,839,000us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
General Partner [Member] | Essex Portfolio, L.P. [Member]        
Equity:        
General Partners' Capital Account 6,074,124,000us-gaap_GeneralPartnersCapitalAccount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
1,945,091,000us-gaap_GeneralPartnersCapitalAccount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
   
General Partner [Member] | Common Equity [Member] | Essex Portfolio, L.P. [Member]        
Equity:        
General Partners' Capital Account 6,002,915,000us-gaap_GeneralPartnersCapitalAccount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_PartnerCapitalComponentsAxis
= ess_CommonEquityMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
1,873,882,000us-gaap_GeneralPartnersCapitalAccount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_PartnerCapitalComponentsAxis
= ess_CommonEquityMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
   
Total Capital 6,002,915,000us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_PartnerCapitalComponentsAxis
= ess_CommonEquityMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
1,873,882,000us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_PartnerCapitalComponentsAxis
= ess_CommonEquityMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
1,762,856,000us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_PartnerCapitalComponentsAxis
= ess_CommonEquityMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
1,439,089,000us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_PartnerCapitalComponentsAxis
= ess_CommonEquityMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
General Partner [Member] | Preferred Equity [Member] | Essex Portfolio, L.P. [Member]        
Equity:        
General Partners' Capital Account 71,209,000us-gaap_GeneralPartnersCapitalAccount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_PartnerCapitalComponentsAxis
= ess_PreferredEquityMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
71,209,000us-gaap_GeneralPartnersCapitalAccount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_PartnerCapitalComponentsAxis
= ess_PreferredEquityMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
   
Total Capital $ 71,209,000us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_PartnerCapitalComponentsAxis
= ess_PreferredEquityMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
$ 71,209,000us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_PartnerCapitalComponentsAxis
= ess_PreferredEquityMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
$ 71,209,000us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_PartnerCapitalComponentsAxis
= ess_PreferredEquityMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
$ 71,209,000us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_PartnerCapitalComponentsAxis
= ess_PreferredEquityMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember