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Equity, Capital and Other Interests Preferred (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Class of Stock [Line Items] |  |  |
Preferred Stock, Shares Authorized | 100,000,000 us-gaap_PreferredStockSharesAuthorized | 100,000,000 us-gaap_PreferredStockSharesAuthorized |
Preferred Stock, Par or Stated Value Per Share | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare |
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized; 1,000,000 shares issued and outstanding as of December 31, 2014 and December 31, 2013 | $ 50,000 us-gaap_PreferredStockValueOutstanding | $ 50,000 us-gaap_PreferredStockValueOutstanding |
Change in market value of Redeemable Noncontrolling Interests | 139,818 us-gaap_MinorityInterestChangeInRedemptionValue | (79,667)us-gaap_MinorityInterestChangeInRedemptionValue | (38,734)us-gaap_MinorityInterestChangeInRedemptionValue
Series K Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock Preference Units Issued | 1,000,000 eqr_PreferredStockPreferenceUnitsIssued / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember | 1,000,000 eqr_PreferredStockPreferenceUnitsIssued / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |
Preferred Stock Preference Units Outstanding | 1,000,000 eqr_PreferredStockPreferenceUnitsOutstanding / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember | 1,000,000 eqr_PreferredStockPreferenceUnitsOutstanding / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |
Preferred Stock Preference Units Redemption Price Per Share Unit | $ 50.00 eqr_PreferredStockPreferenceUnitsRedemptionPricePerShareUnit / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember | $ 50.00 eqr_PreferredStockPreferenceUnitsRedemptionPricePerShareUnit / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |
Preferred Stock Preference Units Dividend Rate Percentage | 8.29%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember | 8.29%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |
Preferred Stocks Preference Units Redemption Date | Dec. 10, 2026 |  |
Annual Dividend Per Preferred Share Preference Unit | $ 4.145 eqr_AnnualDividendPerPreferredSharePreferenceUnit / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  |
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized; 1,000,000 shares issued and outstanding as of December 31, 2014 and December 31, 2013 | 50,000 us-gaap_PreferredStockValueOutstanding / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember | 50,000 us-gaap_PreferredStockValueOutstanding / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |
Operating Partnership [Member] | Series K Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock Preference Units Issued | 1,000,000 eqr_PreferredStockPreferenceUnitsIssued / dei_LegalEntityAxis = eqr_OperatingPartnershipMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember | 1,000,000 eqr_PreferredStockPreferenceUnitsIssued / dei_LegalEntityAxis = eqr_OperatingPartnershipMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |
Preferred Stock Preference Units Outstanding | 1,000,000 eqr_PreferredStockPreferenceUnitsOutstanding / dei_LegalEntityAxis = eqr_OperatingPartnershipMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember | 1,000,000 eqr_PreferredStockPreferenceUnitsOutstanding / dei_LegalEntityAxis = eqr_OperatingPartnershipMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |
Preferred Stock Preference Units Redemption Price Per Share Unit | $ 50.00 eqr_PreferredStockPreferenceUnitsRedemptionPricePerShareUnit / dei_LegalEntityAxis = eqr_OperatingPartnershipMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember | $ 50.00 eqr_PreferredStockPreferenceUnitsRedemptionPricePerShareUnit / dei_LegalEntityAxis = eqr_OperatingPartnershipMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |
Preferred Stock Preference Units Dividend Rate Percentage | 8.29%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / dei_LegalEntityAxis = eqr_OperatingPartnershipMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember | 8.29%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / dei_LegalEntityAxis = eqr_OperatingPartnershipMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |
Preferred Stocks Preference Units Redemption Date | Dec. 10, 2026 |  |
Annual Dividend Per Preferred Share Preference Unit | $ 4.145 eqr_AnnualDividendPerPreferredSharePreferenceUnit / dei_LegalEntityAxis = eqr_OperatingPartnershipMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |  |
Preferred Units Value Outstanding | $ 50,000 eqr_PreferredUnitsValueOutstanding / dei_LegalEntityAxis = eqr_OperatingPartnershipMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember | $ 50,000 eqr_PreferredUnitsValueOutstanding / dei_LegalEntityAxis = eqr_OperatingPartnershipMember / us-gaap_StatementClassOfStockAxis = eqr_SeriesKPreferredStockMember |

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- Definition Aggregate dividends payable during the year for each share/unit of preferred stock/preference units outstanding. + References No definition available. + Details
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- Definition The percentage rate used to calculate dividend payments on preferred shares/preference units. + References No definition available. + Details
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- Definition Total number of preferred shares/preference units issued to security holders. May be all or portion of the number of preferred shares/preference units authorized. Excludes preferred shares/preference units that are classified as debt. + References No definition available. + Details
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- Definition Aggregate number of preferred shares/preference units held by security holders. Does not include preferred shares/preference units that have been repurchased. + References No definition available. + Details
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- Definition The price per share/unit at which the preferred share/preference units of the entity has priority over common shares/units in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of these preferred shares/units are solely within the control of the issuer. + References No definition available. + Details
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- Definition The date at which or after redeemable preferred stock/preference units may be redeemed for cash at the option of the company in whole or in part at a redemption price equal to the liquidation price per share/units plus accrued and unpaid distributions if any. + References No definition available. + Details
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- Definition Value of all preference units held by limited partners, which also represents their ownership interest. + References No definition available. + Details
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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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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + 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 (SX 210.5-02.28) -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 29 -Article 5 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + 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 (SX 210.5-02.28) -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 29 -Article 5 + Details
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- Definition Value of all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by shareholders, which is net of related treasury stock. May be all or a portion of the number of preferred shares authorized. These shares represent the ownership interest of the preferred shareholders. + 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 (SX 210.5-02.28) -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 29 -Article 5 + Details
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