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Derivative and Other Fair Value Instruments (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Fair Value Of Serp Investments $ 97,391eqr_FairValueOfSerpInvestments $ 104,463eqr_FairValueOfSerpInvestments
Assets, Fair Value Disclosure 104,283us-gaap_AssetsFairValueDisclosure 106,391us-gaap_AssetsFairValueDisclosure
Derivative liability, fair value 26,014us-gaap_DerivativeFairValueOfDerivativeLiability 14,104us-gaap_DerivativeFairValueOfDerivativeLiability
Other Liabilities, Fair Value Disclosure 97,391us-gaap_OtherLiabilitiesFairValueDisclosure 104,463us-gaap_OtherLiabilitiesFairValueDisclosure
Liabilities, Fair Value Disclosure 123,405us-gaap_LiabilitiesFairValueDisclosure 118,567us-gaap_LiabilitiesFairValueDisclosure
Redeemable Noncontrolling Interest Operating Partnership Fair Value Disclosure 541,866eqr_RedeemableNoncontrollingInterestOperatingPartnershipFairValueDisclosure 500,733eqr_RedeemableNoncontrollingInterestOperatingPartnershipFairValueDisclosure
Fair Value, Inputs, Level 1 [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value Of Serp Investments 97,391eqr_FairValueOfSerpInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
104,463eqr_FairValueOfSerpInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Assets, Fair Value Disclosure 97,391us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
104,463us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Derivative liability, fair value 0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Other Liabilities, Fair Value Disclosure 97,391us-gaap_OtherLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
104,463us-gaap_OtherLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Liabilities, Fair Value Disclosure 97,391us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
104,463us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Redeemable Noncontrolling Interest Operating Partnership Fair Value Disclosure 0eqr_RedeemableNoncontrollingInterestOperatingPartnershipFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0eqr_RedeemableNoncontrollingInterestOperatingPartnershipFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value Of Serp Investments 0eqr_FairValueOfSerpInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0eqr_FairValueOfSerpInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Assets, Fair Value Disclosure 6,892us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
1,928us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Derivative liability, fair value 26,014us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
14,104us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Other Liabilities, Fair Value Disclosure 0us-gaap_OtherLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_OtherLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Liabilities, Fair Value Disclosure 26,014us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
14,104us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Redeemable Noncontrolling Interest Operating Partnership Fair Value Disclosure 541,866eqr_RedeemableNoncontrollingInterestOperatingPartnershipFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
500,733eqr_RedeemableNoncontrollingInterestOperatingPartnershipFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value Of Serp Investments 0eqr_FairValueOfSerpInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0eqr_FairValueOfSerpInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Assets, Fair Value Disclosure 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Derivative liability, fair value 0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Other Liabilities, Fair Value Disclosure 0us-gaap_OtherLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_OtherLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Liabilities, Fair Value Disclosure 0us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Redeemable Noncontrolling Interest Operating Partnership Fair Value Disclosure 0eqr_RedeemableNoncontrollingInterestOperatingPartnershipFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0eqr_RedeemableNoncontrollingInterestOperatingPartnershipFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair Value Hedging [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 6,438us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FairValueHedgingMember
1,596us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FairValueHedgingMember
Fair Value Hedging [Member] | Fair Value, Inputs, Level 1 [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value Hedging [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 6,438us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
1,596us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value Hedging [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Forward Starting Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 454us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= eqr_ForwardStartingSwapsMember
332us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= eqr_ForwardStartingSwapsMember
Forward Starting Swaps [Member] | Fair Value, Inputs, Level 1 [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= eqr_ForwardStartingSwapsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= eqr_ForwardStartingSwapsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Forward Starting Swaps [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 454us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= eqr_ForwardStartingSwapsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
332us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= eqr_ForwardStartingSwapsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Forward Starting Swaps [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset $ 0us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= eqr_ForwardStartingSwapsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 0us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= eqr_ForwardStartingSwapsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member