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Equity, Capital and Other Interests Redeemable (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Redeemable Noncontrolling Interests Operating Partnership | $ 541,866 eqr_RedeemableNoncontrollingInterestsOperatingPartnership | $ 500,733 eqr_RedeemableNoncontrollingInterestsOperatingPartnership
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership | 41,763 us-gaap_MinorityInterestChangeInRedemptionValue |
Change in carrying value | (630)us-gaap_TemporaryEquityIssuePeriodIncreaseOrDecrease |
OPERATING PARTNERSHIP |  |
Limited Partners Change In Redemption Value | 41,763 eqr_LimitedPartnersChangeInRedemptionValue / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember |
Limited Partners Change In Carrying Value | (630)eqr_LimitedPartnersChangeInCarryingValue / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember |
Redeemable Limited Partners | $ 541,866 eqr_RedeemableLimitedPartners / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 500,733 eqr_RedeemableLimitedPartners / 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
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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
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Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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
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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
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Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Change in the value of each type or class of stock classified as temporary equity during the period. The redemption requirement does not constitute an unconditional obligation that will be settled in a variable number of shares constituting a monetary value predominantly indexed to (a) a fixed monetary amount known at inception, (b) an amount inversely correlated with the residual value of the entity, or (c) an amount determined by reference to something other than the fair value of issuer's stock. Does not include mandatorily redeemable stock. The exception is if redemption is required upon liquidation or termination of the reporting entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (27) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Subparagraph c -Article 5 + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |