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Commitments to Acquire/Dispose of Real Estate (Details) (USD $) In Thousands, unless otherwise specified | Oct. 31, 2014
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Commitments to Acquire Real Estate |
Properties Acquired-Total | 1
Rental Units Acquired - Total | 161
Purchase Price - Total | $ 64,300
Commitments to Dispose of Real Estate |
Properties Disposed - Total | 3
Rental Units Disposed-Total | 529
Sales Price For Commitments To Dispose | 156,500
Rental Properties Disposed of [Member] |
Commitments to Dispose of Real Estate |
Properties Disposed - Total | 3
Rental Units Disposed-Total | 529
Sales Price For Commitments To Dispose | 124,400
Land [Member] |
Commitments to Acquire Real Estate |
Land Parcels Contracted To Be Acquired | 1
Commitments to Dispose of Real Estate |
Sales Price For Commitments To Dispose | 32,100
Land Parcels Contracted To Be Disposed | 1
Consolidated Rental Properties [Member] |
Commitments to Acquire Real Estate |
Properties Acquired-Total | 1
Rental Units Acquired - Total | 161
Purchase Price - Total | 61,000
Land [Member] |
Commitments to Acquire Real Estate |
Purchase Price - Total | $ 3,300

X
- Details
Name: | eqr_CommitmentsToAcquireOfRealEstateAbstract
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | eqr_CommitmentsToDisposeOfRealEstateAbstract
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total number of land parcels to be acquired subsequent to the balance sheet date per separate agreements entered into prior to the balance sheet date. + References No definition available. + Details
Name: | eqr_LandParcelsContractedToBeAcquired
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of land parcels to be disposed subsequent to the balance sheet date per separate agreements entered into prior to the balance sheet date. + References No definition available. + Details
Name: | eqr_LandParcelsContractedToBeDisposed
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of rental properties to be acquired subsequent to the balance sheet date per separate agreements entered into prior to the balance sheet date. + References No definition available. + Details
Name: | eqr_PropertiesContractedToBeAcquired
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of rental properties to be disposed of subsequent to the balance sheet date per separate agreements entered into prior to the balance sheet date. + References No definition available. + Details
Name: | eqr_PropertiesContractedToBeDisposed
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of the fixed and determinable portion of an unrecorded purchase commitment for the acquisition of a rental property or land parcel subsequent to the balance sheet date. + References No definition available. + Details
Name: | eqr_PurchasePriceForCommitmentsToAcquire
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of the fixed and determinable portion of an unrecorded sales commitment for the disposition of a rental property, land parcel or other property subsequent to the balance sheet date. + References No definition available. + Details
Name: | eqr_SalesPriceForCommitmentsToDispose
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total number of rental units to be acquired subsequent to the balance sheet date per separate agreements entered into prior to the balance sheet date. + References No definition available. + Details
Name: | eqr_UnitsContractedToBeAcquired
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of rental units to be disposed of subsequent to the balance sheet date per separate agreements entered into prior to the balance sheet date. + References No definition available. + Details
Name: | eqr_UnitsContractedToBeDisposed
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant