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Commitments To Acquire/Dispose of Real Estate (Tables) | 9 Months Ended
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Sep. 30, 2017
Commitments To Acquire Dispose Of Real Estate [Abstract] |
Separate Agreement to Dispose of | The Company has entered into a separate agreement to dispose of the following (sales price in thousands):
|  | Properties |  |  | Apartment Units |  |  | Sales Price |
Land Parcels (one) |  |  | — |  |  |  | — |  |  | $ | 2,700 |
Total |  |  | — |  |  |  | — |  |  | $ | 2,700 |

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- Definition Commitments to Acquire/Dispose of Real Estate. + References No definition available. + Details
Name: | eqr_CommitmentsToAcquireDisposeOfRealEstateAbstract
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Breakdown of rental properties, units and land parcels 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_RealEstateToBeDisposedOfTableTextBlock
Namespace Prefix: | eqr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration