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Commitments to Acquire/Dispose of Real Estate (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Purchase Price For Commitments To Acquire | $ 162,350 eqr_PurchasePriceForCommitmentsToAcquire
Rental Properties Disposed of [Member] |
Properties Contracted To Be Disposed | 1 eqr_PropertiesContractedToBeDisposed / eqr_CommitmentsToDisposeOfAxis = eqr_RentalPropertiesDisposedOfMember
Sales Price For Commitments To Dispose | 169,800 eqr_SalesPriceForCommitmentsToDispose / eqr_CommitmentsToDisposeOfAxis = eqr_RentalPropertiesDisposedOfMember
Units Contracted To Be Disposed | 150 eqr_UnitsContractedToBeDisposed / eqr_CommitmentsToDisposeOfAxis = eqr_RentalPropertiesDisposedOfMember
Retail Site [Member] |
Properties Contracted To Be Disposed | 1 eqr_PropertiesContractedToBeDisposed / eqr_CommitmentsToDisposeOfAxis = us-gaap_RetailSiteMember
Sales Price For Commitments To Dispose | 123,300 eqr_SalesPriceForCommitmentsToDispose / eqr_CommitmentsToDisposeOfAxis = us-gaap_RetailSiteMember
Square footage [Member] |
Properties Contracted To Be Disposed | 193,230 eqr_PropertiesContractedToBeDisposed / eqr_CommitmentsToDisposeOfAxis = eqr_SquarefootageMember
Rental Properties to be acquired [Member] |
Properties Contracted To Be Acquired | 1 eqr_PropertiesContractedToBeAcquired / eqr_CommitmentsToAcquireAxis = eqr_RentalPropertiesToBeAcquiredMember
Units Contracted To Be Acquired | 202 eqr_UnitsContractedToBeAcquired / eqr_CommitmentsToAcquireAxis = eqr_RentalPropertiesToBeAcquiredMember
Purchase Price For Commitments To Acquire | 131,250 eqr_PurchasePriceForCommitmentsToAcquire / eqr_CommitmentsToAcquireAxis = eqr_RentalPropertiesToBeAcquiredMember
Land Parcel [Member] |
Purchase Price For Commitments To Acquire | $ 31,100 eqr_PurchasePriceForCommitmentsToAcquire / eqr_CommitmentsToAcquireAxis = eqr_LandParcelMember
Land Parcels Contracted To Be Acquired | 4 eqr_LandParcelsContractedToBeAcquired / eqr_CommitmentsToAcquireAxis = eqr_LandParcelMember

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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 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

X
- Details
Name: | eqr_CommitmentsToAcquireAxis=eqr_LandParcelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | eqr_CommitmentsToAcquireAxis=eqr_RentalPropertiesToBeAcquiredMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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