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

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- Definition Fair value of employee holdings other than common shares within the supplemental executive retirement plan at the balance sheet date. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of non-controlling interests which are redeemable by the parent at a fixed or determinable price on a fixed or determinable date, at the option of the holder of the non-controlling interest, or upon occurrence of an event that is not solely within the control of the parent. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value portion of other liabilities. + References No definition available. + Details
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