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v2.4.1.9

Equity, Capital and Other Interests ERP Units (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Capital Unit [Line Items] |  |
Common Shares And Units Outstanding | 378,446,365 eqr_CommonSharesAndUnitsOutstanding |
Exercise of EQR share options | 770,012 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |
EQR's Employee Share Purchase Plan (ESPP) | 30,151 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans |
Restricted Share Grants, net | 158,753 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures |
Shares Issued During Period Shares Conversion Of Units To Common Shares | 154,050 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits |
Units Ownership Interest in Operating Partnership | 3.80%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners |
Limited Partner [Member] |  |
Capital Unit [Line Items] |  |
Limited Partners' Capital Account, Units Outstanding | 14,477,945 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_LimitedPartnerMember | 14,298,691 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_LimitedPartnerMember
Restricted units, net | 333,304 eqr_IssuanceOfLtips / us-gaap_StatementClassOfStockAxis = us-gaap_LimitedPartnerMember |
Shares Issued During Period Shares Conversion Of Units To Common Shares | (154,050)us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementClassOfStockAxis = us-gaap_LimitedPartnerMember |
General And Limited Partner [Member] |  |
Capital Unit [Line Items] |  |
Common Shares And Units Outstanding | 378,446,365 eqr_CommonSharesAndUnitsOutstanding / us-gaap_StatementClassOfStockAxis = eqr_GeneralAndLimitedPartnerMember | 377,154,145 eqr_CommonSharesAndUnitsOutstanding / us-gaap_StatementClassOfStockAxis = eqr_GeneralAndLimitedPartnerMember
Exercise of EQR share options | 770,012 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementClassOfStockAxis = eqr_GeneralAndLimitedPartnerMember |
EQR's Employee Share Purchase Plan (ESPP) | 30,151 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementClassOfStockAxis = eqr_GeneralAndLimitedPartnerMember |
Restricted Share Grants, net | 158,753 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementClassOfStockAxis = eqr_GeneralAndLimitedPartnerMember |
Restricted units, net | 333,304 eqr_IssuanceOfLtips / us-gaap_StatementClassOfStockAxis = eqr_GeneralAndLimitedPartnerMember |

X
- Definition Number of all classes of common stock held by shareholders, which is net of related treasury stock, and number of all Operating Partnership Units held by various individuals and entities that contributed their properties to the Operating Partnership. + References No definition available. + Details
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- Definition Number of units issued during the period as a result of a long-term incentive plan. + References No definition available. + Details
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- Definition The number of limited partner units outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F + Details
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