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Commitments to Acquire/Dispose of Real Estate (Details) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2015
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Commitments to Acquire Real Estate |
Properties Acquired-Total | 0 eqr_PropertiesContractedToBeAcquired
Rental Units Acquired - Total | 0 eqr_UnitsContractedToBeAcquired
Purchase Price - Total | $ 25,132 eqr_PurchasePriceForCommitmentsToAcquire
Commitments to Dispose of Real Estate |
Properties Disposed - Total | 2 eqr_PropertiesContractedToBeDisposed
Rental Units Disposed-Total | 513 eqr_UnitsContractedToBeDisposed
Sales Price For Commitments To Dispose | 71,350 eqr_SalesPriceForCommitmentsToDispose
Rental Properties Disposed of [Member] |
Commitments to Dispose of Real Estate |
Properties Disposed - Total | 2 eqr_PropertiesContractedToBeDisposed / eqr_CommitmentsToDisposeOfAxis = eqr_RentalPropertiesDisposedOfMember
Rental Units Disposed-Total | 513 eqr_UnitsContractedToBeDisposed / eqr_CommitmentsToDisposeOfAxis = eqr_RentalPropertiesDisposedOfMember
Sales Price For Commitments To Dispose | 68,650 eqr_SalesPriceForCommitmentsToDispose / eqr_CommitmentsToDisposeOfAxis = eqr_RentalPropertiesDisposedOfMember
Land [Member] |
Commitments to Dispose of Real Estate |
Sales Price For Commitments To Dispose | 2,700 eqr_SalesPriceForCommitmentsToDispose / eqr_CommitmentsToDisposeOfAxis = us-gaap_LandMember
Land Parcels Contracted To Be Disposed | 1 eqr_LandParcelsContractedToBeDisposed / eqr_CommitmentsToDisposeOfAxis = us-gaap_LandMember
Land [Member] |
Commitments to Acquire Real Estate |
Purchase Price - Total | $ 25,132 eqr_PurchasePriceForCommitmentsToAcquire / eqr_CommitmentsToAcquireAxis = us-gaap_LandMember
Land Parcels Contracted To Be Acquired | 3 eqr_LandParcelsContractedToBeAcquired / eqr_CommitmentsToAcquireAxis = us-gaap_LandMember

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

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

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- 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

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- 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

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- 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

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- Details
Name: | eqr_CommitmentsToAcquireAxis=us-gaap_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | eqr_CommitmentsToDisposeOfAxis=eqr_RentalPropertiesDisposedOfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | eqr_CommitmentsToDisposeOfAxis=us-gaap_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |