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Commitments to Acquire/Dispose of Real Estate (Tables) | 6 Months Ended
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Jun. 30, 2015
Commitments to Acquire Dispose of Real Estate [Abstract] |
Real Estate to be Acquired Table Text Block | The Company has entered into separate agreements to acquire the following (purchase price in thousands):
|  | Properties |  | Apartment Units |  | Purchase Price
Land Parcels (two) |  | — |  |  | — |  |  | $ | 21,832 |
Other |  | — |  |  | 2 |  |  | 6,000 |
Total |  | — |  |  | 2 |  |  | $ | 27,832 |
Real Estate To Be Disposed Of Text Block | The Company has entered into separate agreements to dispose of the following (sales price in thousands):
|  | Properties |  | Apartment Units |  | Sales Price
Rental Properties |  | 2 |  |  | 522 |  |  | $ | 104,838 |
Land Parcels (three) |  | — |  |  | — |  |  | 29,900 |
Total |  | 2 |  |  | 522 |  |  | $ | 134,738 |

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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, land parcels and associated 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_RealEstateToBeAcquiredTableTextBlockTableTextBlock
Namespace Prefix: | eqr_
Data Type: | nonnum:textBlockItemType
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