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Equity, Capital and Other Interest Redeemable (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Redeemable Noncontrolling Interests - Operating Partnership | $ 500,733 eqr_RedeemableNoncontrollingInterestsOperatingPartnership | $ 363,144 eqr_RedeemableNoncontrollingInterestsOperatingPartnership | $ 398,372 eqr_RedeemableNoncontrollingInterestsOperatingPartnership | $ 416,404 eqr_RedeemableNoncontrollingInterestsOperatingPartnership
Change in carrying value | (2,229)eqr_MinorityInterestChangeInCarryingValue | 44,439 eqr_MinorityInterestChangeInCarryingValue | 20,702 eqr_MinorityInterestChangeInCarryingValue |
Partnership Interest [Member] |  |  |  |
Redeemable Limited Partners | 500,733 eqr_RedeemableLimitedPartners / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 363,144 eqr_RedeemableLimitedPartners / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember |  |
Redemption Value Limited Partners | 500,733 eqr_RedemptionValueLimitedPartners / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 363,144 eqr_RedemptionValueLimitedPartners / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 398,372 eqr_RedemptionValueLimitedPartners / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 416,404 eqr_RedemptionValueLimitedPartners / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Limited Partners Change In Redemption Value | 139,818 eqr_LimitedPartnersChangeInRedemptionValue / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | (79,667)eqr_LimitedPartnersChangeInRedemptionValue / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | (38,734)eqr_LimitedPartnersChangeInRedemptionValue / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember |
Limited Partners Change In Carrying Value | $ (2,229)eqr_LimitedPartnersChangeInCarryingValue / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 44,439 eqr_LimitedPartnersChangeInCarryingValue / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 20,702 eqr_LimitedPartnersChangeInCarryingValue / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember |

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- Definition Represents the change in the proportional relationship between the carrying values of capital associated with general partner units relative to that of the Limited Partners. + References No definition available. + Details
Name: | eqr_LimitedPartnersChangeInCarryingValue
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Change in the value of Redeemable Limited Partners Units as a result of changes in the fair value of the company's common shares during the period. + References No definition available. + Details
Name: | eqr_LimitedPartnersChangeInRedemptionValue
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the change in the proportional relationship between the carrying values of equity associated with common shares relative to that of the noncontrolling interests. + References No definition available. + Details
Name: | eqr_MinorityInterestChangeInCarryingValue
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The greater of carrying value (book value) or fair market value of an entity's issued and outstanding Units which is not included within Partner's Capital in Capital. Represents a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the units to another class of equity. + References No definition available. + Details
Name: | eqr_RedeemableLimitedPartners
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The greater of carrying value (book value) or fair market value of an entity's issued and outstanding stock which is not included within permanent equity in Stockholders Equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. + References No definition available. + Details
Name: | eqr_RedeemableNoncontrollingInterestsOperatingPartnership
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Value of parent company common shares that would be issued in exchange for Redeemable Limited Partner Units at the ending of the period. + References No definition available. + Details
Name: | eqr_RedemptionValueLimitedPartners
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=us-gaap_PartnershipInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |