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v2.4.1.9

Business (Details) | Dec. 31, 2014
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Property/Unit schedule |
Wholly Owned Properties | 364 eqr_WhollyOwnedProperties
Master Leased Properties Acquired | 3 eqr_MasterLeasedPropertiesAcquired
Partially Owned Consolidated Properties | 19 eqr_PartiallyOwnedConsolidatedProperties
Partially Owned Unconsolidated Properties | 3 eqr_PartiallyOwnedUnconsolidatedProperties
Military Housing Properties | 2 eqr_MilitaryHousingProperties
Wholly Owned Units | 98,287 eqr_WhollyOwnedUnits
Master Leased Units | 853 eqr_MasterLeasedUnits
Partially Owned Consolidated Units | 3,771 eqr_PartiallyOwnedConsolidatedUnits
Partially Owned Unconsolidated Units | 1,281 eqr_PartiallyOwnedUnconsolidatedUnits
Military Housing Units | 5,033 eqr_MilitaryHousingUnits
Business (Textuals) [Abstract] |
Number of operating properties under long-term ground leases | 13 eqr_NumberOfOperatingPropertiesUnderLongTermGroundLeases
Number of land parcels under long-term ground leases | 1 eqr_NumberOfLandParcelsUnderLongTermGroundLeases
Noncontrolling Interest, Ownership Percentage by Parent | 96.20%us-gaap_MinorityInterestOwnershipPercentageByParent
Number of Real Estate Properties | 391 us-gaap_NumberOfRealEstateProperties
Number of Units in Real Estate Property | 109,225 us-gaap_NumberOfUnitsInRealEstateProperty
Number of States in which Entity Operates | 12 us-gaap_NumberOfStatesInWhichEntityOperates

X
- Details
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- Definition Total number of property or properties acquired from unaffiliated third parties during the period that are subject to a master lease arrangement under which the Company leases the property to a third party operator in exchange for net rental income. + References No definition available. + Details
Name: | eqr_MasterLeasedPropertiesAcquired
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Balance Type: | na
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- Definition Total number of units associated with rental properties that are subject to a master lease. + References No definition available. + Details
Name: | eqr_MasterLeasedUnits
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of rental properties that represent military housing and are not consolidated by the Company. + References No definition available. + Details
Name: | eqr_MilitaryHousingProperties
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Balance Type: | na
Period Type: | instant

X
- Definition Total number of units associated with rental properties that represent military housing and are not consolidated by the Company. + References No definition available. + Details
Name: | eqr_MilitaryHousingUnits
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of land parcels for which the Company owns the building and improvements and leases the underlying land under long-term ground leases. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Number of operating properties for which the Company owns the building and improvements and leases the underlying land under long-term ground leases. + References No definition available. + Details
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- Definition Total number of rental properties that are partially owned and consolidated by the Company. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of units associated with rental properties that are partially owned and consolidated by the Company. + References No definition available. + Details
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Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of rental properties that are partially owned and not consolidated by the Company. + References No definition available. + Details
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Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Total number of units associated with rental properties that are partially owned and not consolidated by the Company. + References No definition available. + Details
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- Details
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- Definition Total number of rental properties that are wholly owned and consolidated by the Company. + References No definition available. + Details
Name: | eqr_WhollyOwnedProperties
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Total number of units associated with rental properties that are wholly owned and consolidated by the Company. + References No definition available. + Details
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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
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