XML 69 R53.htm IDEA: XBRL DOCUMENT
v3.19.2

Real Estate - Acquired Properties From Unaffiliated Parties (Details) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 USD ($) Property ApartmentUnit
Properties acquired | Property | 6
Property Units acquired | ApartmentUnit | 1,644
Purchase Price | $ 650,882
Rental Properties - Consolidated [Member] |
Properties acquired | Property | 6
Property Units acquired | ApartmentUnit | 1,644
Purchase Price | $ 634,650
Land Parcels [Member] |
Purchase Price | $ 16,232

X
- Definition Total number of property or properties acquired from unaffiliated third parties during the period. + References No definition available. + Details
Name: | eqr_PropertiesAcquired
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total number of units associated with the property or properties acquired from unaffiliated third parties during the period. + References No definition available. + Details
Name: | eqr_PropertyUnitsAcquired
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=eqr_ConsolidatedRentalPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=eqr_LandParcelsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |