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Commitments to Acquire/Dispose of Real Estate (Details) - Commitments [Member] $ in Thousands | Feb. 19, 2016 USD ($) property
--- | ---
Properties Contracted To Be Acquired | 3
Units Contracted To Be Acquired | 549
Purchase Price For Commitments To Acquire | $ 242,880
Properties Contracted To Be Disposed | property | 0
Units Contracted To Be Disposed | 0
Sales Price For Commitments To Dispose | $ 14,886
Land [Member] |
Sales Price For Commitments To Dispose | $ 14,886
Land Parcels Contracted To Be Disposed | 2
Rental Properties to be acquired [Member] |
Properties Contracted To Be Acquired | 3
Units Contracted To Be Acquired | 549
Purchase Price For Commitments To Acquire | $ 242,880

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

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_CommitmentsMember
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: |

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