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v2.4.1.9

Real Estate (Details 2) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2015 | Mar. 31, 2015 | Mar. 31, 2014
Properties acquired | 1 eqr_PropertiesAcquired | 0 eqr_PropertiesAcquired |
Property Units Acquired | 202 eqr_PropertyUnitsAcquired | 0 eqr_PropertyUnitsAcquired |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 130,300 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets | $ 5,968 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets |
Disposed Properties | 1 eqr_DisposedProperties | 3 eqr_DisposedProperties |
Disposed Units | 314 eqr_DisposedUnits | 550 eqr_DisposedUnits |
Proceeds From Sale Of Property | 49,600 eqr_ProceedsFromSaleOfProperty | 145,400 eqr_ProceedsFromSaleOfProperty |
Net gain on sales of real estate properties |  | 79,951 us-gaap_GainsLossesOnSalesOfInvestmentRealEstate | 0 us-gaap_GainsLossesOnSalesOfInvestmentRealEstate
Consolidated Rental Properties [Member] |  |  |
Disposed Properties |  | 3 eqr_DisposedProperties / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ConsolidatedRentalPropertiesMember |
Disposed Units |  | 550 eqr_DisposedUnits / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ConsolidatedRentalPropertiesMember |
Proceeds From Sale Of Property |  | 145,400 eqr_ProceedsFromSaleOfProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqr_ConsolidatedRentalPropertiesMember |
Land [Member] |  |  |
Land parcels acquired |  | 1 eqr_LandParcelsAcquired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_LandMember |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | $ 5,968 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = us-gaap_LandMember |

X
- Definition The total number of rental properties that the Company disposed of to unaffiliated parties during the period. + References No definition available. + Details
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Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Total number of rental units associated with rental properties that the company disposed of to unaffiliated third parties during the period. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
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Period Type: | duration

X
- Definition Total number of land parcel or parcels acquired from unaffiliated third parties during the period. + References No definition available. + Details
Name: | eqr_LandParcelsAcquired
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow from the sale of real estate investment property. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Total number of property or properties acquired from unaffiliated third parties during the period. + References No definition available. + Details
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- Definition Total number of units associated with the property or properties acquired from unaffiliated third parties during the period. + References No definition available. + Details
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Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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X
- Definition The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 14 -Subparagraph d -Article 9 + Details
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- Details
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- Details
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