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Individually Significant Dispositions - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 23, 2015 USD ($) Property | Mar. 31, 2017 USD ($) Property ApartmentUnit | Mar. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Disposed Properties | Property |  | 1 |  |
Disposed Units | ApartmentUnit |  | 304 |  |
Proceeds From Sale Of Property | $ |  | $ 81,050 |  |
Starwood Portfolio [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Disposed Properties | Property | 72 |  |  |
Disposed Units | 23,262 |  |  |
Proceeds From Sale Of Property | $ | $ 5,365,000 |  |  |
Percentage of consolidated NOI |  |  | 4.50% | 15.70%

X
- Definition The total number of rental properties that the Company disposed of to unaffiliated parties during the period. + References No definition available. + Details
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Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Total number of rental units associated with rental properties that the company disposed of to unaffiliated third parties during the period. + References No definition available. + Details
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Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the NOI for the disposition portfolio that is classified as an individually significant disposition as a percentage of NOI for the consolidated company. + References No definition available. + Details
Name: | eqr_PercentageofconsolidatedNOI
Namespace Prefix: | eqr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash inflow from the sale of real estate investment property. + References No definition available. + Details
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Balance Type: | debit
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |