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Commitments To Acquire/Dispose of Real Estate (Tables) | 12 Months Ended
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Dec. 31, 2015
Commitments to Acquire Dispose of Real Estate [Abstract] |
Real Estate To Be Acquired Table Text Block [Table Text Block] | The Company has entered into separate agreements to acquire the following (purchase price in thousands):
|  | Properties |  | Apartment Units |  | Purchase Price
Rental Properties |  | 3 |  |  | 549 |  |  | $ | 242,880 |
Total |  | 3 |  |  | 549 |  |  | $ | 242,880 |
Real Estate To Be Disposed Table Text Block | In addition to the properties that were subsequently disposed of as discussed in Note 18, the Company has entered into separate agreements to dispose of the following (sales price in thousands):
|  | Properties |  | Apartment Units |  | Sales Price
Land Parcels (two) |  | — |  |  | — |  |  | $ | 14,886 |
Total |  | — |  |  | — |  |  | $ | 14,886 |
Commitments To Acquire Dispose Of Real Estate Text Block |
5. | Commitments to Acquire/Dispose of Real Estate
The Company has entered into separate agreements to acquire the following (purchase price in thousands):
|  | Properties |  | Apartment Units |  | Purchase Price
Rental Properties |  | 3 |  |  | 549 |  |  | $ | 242,880 |
Total |  | 3 |  |  | 549 |  |  | $ | 242,880 |
In addition to the properties that were subsequently disposed of as discussed in Note 18, the Company has entered into separate agreements to dispose of the following (sales price in thousands):
|  | Properties |  | Apartment Units |  | Sales Price
Land Parcels (two) |  | — |  |  | — |  |  | $ | 14,886 |
Total |  | — |  |  | — |  |  | $ | 14,886 |
The closings of these pending transactions are subject to certain conditions and restrictions, therefore, there can be no assurance that these transactions will be consummated or that the final terms will not differ in material respects from those summarized in the preceding paragraphs.

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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 Disclosure of acquisition/disposition transactions with closing dates subsequent to the balance sheet date for which the Company had entered into separate agreements prior to the balance sheet date. The closing of these transactions is subject to certain conditions and restrictions such that there can be no assurance that these transactions will be consummated or that the final terms will not differ in material respects from the original agreements. + References No definition available. + Details
Name: | eqr_CommitmentsToAcquireDisposeOfRealEstateTextBlock
Namespace Prefix: | eqr_
Data Type: | nonnum:textBlockItemType
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