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v2.4.1.9

Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Rental income: |  |  |
Same store | $ 2,475,933 eqr_SegmentReportingSegmentSameStoreRentalIncome | $ 2,374,350 eqr_SegmentReportingSegmentSameStoreRentalIncome | $ 1,693,239 eqr_SegmentReportingSegmentSameStoreRentalIncome
Segment Reporting Segment Non Same Store Rental Income | 129,378 eqr_SegmentReportingSegmentNonSameStoreRentalIncome | 96,077 eqr_SegmentReportingSegmentNonSameStoreRentalIncome | 44,690 eqr_SegmentReportingSegmentNonSameStoreRentalIncome
Segment Reporting Information Revenues | 2,605,311 eqr_SegmentReportingInformationRevenues | 2,378,004 eqr_SegmentReportingInformationRevenues | 1,737,929 eqr_SegmentReportingInformationRevenues
Operating expenses: |  |  |
Same store | 830,697 eqr_SegmentReportingSegmentSameStoreOperatingExpenses | 815,865 eqr_SegmentReportingSegmentSameStoreOperatingExpenses | 587,037 eqr_SegmentReportingSegmentSameStoreOperatingExpenses
Non-same store/other | 47,438 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses | 48,632 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses | 33,807 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses
Segment Reporting Segment Operating Expenses | 878,135 eqr_SegmentReportingSegmentOperatingExpenses | 827,768 eqr_SegmentReportingSegmentOperatingExpenses | 620,844 eqr_SegmentReportingSegmentOperatingExpenses
NOI: |  |  |
Same store | 1,645,236 eqr_SegmentReportingInformationSameStoreNetOperatingIncome | 1,558,485 eqr_SegmentReportingInformationSameStoreNetOperatingIncome | 1,106,202 eqr_SegmentReportingInformationSameStoreNetOperatingIncome
Non-same store/other | 81,940 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome | 47,445 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome | 10,883 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome
Total NOI | 1,727,176 eqr_SegmentReportingInformationNetOperatingIncome | 1,550,236 eqr_SegmentReportingInformationNetOperatingIncome | 1,117,085 eqr_SegmentReportingInformationNetOperatingIncome
Assets | 22,950,614 us-gaap_Assets | 22,834,545 us-gaap_Assets |
Payments to Acquire Other Property, Plant, and Equipment | 185,957 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment | 135,816 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment |
Reportable Segments (Textuals) [Abstract] |  |  |
Units in same store properties |  | 97,911 eqr_NumberOfUnitsInSameStoreProperties | 80,247 eqr_NumberOfUnitsInSameStoreProperties
Rental income | 2,605,311 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue | 2,378,004 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue | 1,737,929 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Property and maintenance expense | (473,098)us-gaap_CostOfPropertyRepairsAndMaintenance | (449,427)us-gaap_CostOfPropertyRepairsAndMaintenance | (332,219)us-gaap_CostOfPropertyRepairsAndMaintenance
Real estate taxes and insurance expense | (325,401)us-gaap_RealEstateTaxesAndInsurance | (293,999)us-gaap_RealEstateTaxesAndInsurance | (206,723)us-gaap_RealEstateTaxesAndInsurance
Property management expense | (79,636)us-gaap_OwnedPropertyManagementCosts | (84,342)us-gaap_OwnedPropertyManagementCosts | (81,902)us-gaap_OwnedPropertyManagementCosts
Total operating expenses | (878,135)eqr_TotalOperatingExpenses | (827,768)eqr_TotalOperatingExpenses | (620,844)eqr_TotalOperatingExpenses
Archstone [Member] |  |  |
Reportable Segments (Textuals) [Abstract] |  |  |
Units in same store properties |  | 18,465 eqr_NumberOfUnitsInSameStoreProperties / us-gaap_StatementScenarioAxis = eqr_ArchstoneMember |
Same Store [Domain] |  |  |
NOI: |  |  |
Assets | 19,520,222 us-gaap_Assets / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 20,099,805 us-gaap_Assets / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 179,033 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 126,948 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Non-same store [Domain] |  |  |
NOI: |  |  |
Assets | 3,430,392 us-gaap_Assets / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 2,734,740 us-gaap_Assets / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 6,924 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 8,868 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Boston [Domain] |  |  |
Rental income: |  |  |
Same store | 253,032 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain | 244,370 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain | 168,063 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain
Segment Reporting Segment Non Same Store Rental Income | 3,635 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain | 2,728 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain | 0 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain
Operating expenses: |  |  |
Same store | 80,680 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain | 78,249 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain | 54,888 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain
Non-same store/other | 848 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain | 651 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain | 0 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain
NOI: |  |  |
Same store | 172,352 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain | 166,121 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain | 113,175 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain
Non-same store/other | 2,787 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain | 2,077 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain | 0 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain
Boston [Domain] | Same Store [Domain] |  |  |
NOI: |  |  |
Assets | 1,923,540 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 1,984,745 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 19,575 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 17,625 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Boston [Domain] | Non-same store [Domain] |  |  |
NOI: |  |  |
Assets | 48,323 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 49,372 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 699 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 102 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_BostonDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Denver [Domain] |  |  |
Rental income: |  |  |
Same store | 111,190 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain | 103,124 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain | 93,571 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain
Segment Reporting Segment Non Same Store Rental Income |  |  | 1,325 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain
Operating expenses: |  |  |
Same store | 30,812 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain | 30,567 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain | 28,204 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain
Non-same store/other |  |  | 429 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain
NOI: |  |  |
Same store | 80,378 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain | 72,557 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain | 65,367 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain
Non-same store/other |  |  | 896 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain
Denver [Domain] | Same Store [Domain] |  |  |
NOI: |  |  |
Assets | 520,537 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 541,480 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 5,863 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 5,384 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_DenverDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
New York Domain] |  |  |
Rental income: |  |  |
Same store | 455,598 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain | 438,366 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain | 274,683 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain
Segment Reporting Segment Non Same Store Rental Income |  |  | 14,611 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain
Operating expenses: |  |  |
Same store | 171,336 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain | 165,329 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain | 109,667 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain
Non-same store/other |  |  | 5,988 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain
NOI: |  |  |
Same store | 284,262 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain | 273,037 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain | 165,016 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain
Non-same store/other |  |  | 8,623 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain
New York Domain] | Same Store [Domain] |  |  |
NOI: |  |  |
Assets | 4,647,269 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 4,771,001 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 22,118 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 12,006 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_NewYorkDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
San Francisco [Domain] |  |  |
Rental income: |  |  |
Same store | 340,251 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain | 312,345 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain | 159,535 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain
Segment Reporting Segment Non Same Store Rental Income |  |  | 7,268 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain
Operating expenses: |  |  |
Same store | 106,424 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain | 108,218 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain | 57,373 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain
Non-same store/other |  |  | 3,022 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain
NOI: |  |  |
Same store | 233,827 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain | 204,127 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain | 102,162 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain
Non-same store/other |  |  | 4,246 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain
San Francisco [Domain] | Same Store [Domain] |  |  |
NOI: |  |  |
Assets | 2,718,174 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 2,793,390 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 26,995 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 21,756 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SanFranciscoDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Seattle [Domain] |  |  |
Rental income: |  |  |
Same store | 156,714 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain | 146,109 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain | 122,267 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain
Segment Reporting Segment Non Same Store Rental Income | 13,507 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain | 4,387 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain | 4,747 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain
Operating expenses: |  |  |
Same store | 51,293 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain | 49,169 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain | 41,041 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain
Non-same store/other | 4,421 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain | 1,336 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain | 1,510 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain
NOI: |  |  |
Same store | 105,421 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain | 96,940 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain | 81,226 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain
Non-same store/other | 9,086 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain | 3,051 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain | 3,237 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain
Seattle [Domain] | Same Store [Domain] |  |  |
NOI: |  |  |
Assets | 1,032,140 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 1,061,118 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 14,570 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 7,940 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Seattle [Domain] | Non-same store [Domain] |  |  |
NOI: |  |  |
Assets | 318,488 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 182,745 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 1,115 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 55 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SeattleDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
South Florida [Domain] |  |  |
Rental income: |  |  |
Same store | 191,729 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain | 182,620 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain | 177,675 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain
Segment Reporting Segment Non Same Store Rental Income | 5,475 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain | 390 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain | 0 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain
Operating expenses: |  |  |
Same store | 70,296 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain | 69,475 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain | 67,811 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain
Non-same store/other | 2,743 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain | 810 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain | 0 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain
NOI: |  |  |
Same store | 121,433 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain | 113,145 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain | 109,864 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain
Non-same store/other | 2,732 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain | (420)eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain | 0 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain
South Florida [Domain] | Same Store [Domain] |  |  |
NOI: |  |  |
Assets | 1,135,552 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 1,170,931 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 14,335 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 14,351 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
South Florida [Domain] | Non-same store [Domain] |  |  |
NOI: |  |  |
Assets | 67,833 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 68,987 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 8 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 1 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthFloridaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Southern California [Domain] |  |  |
Rental income: |  |  |
Same store | 420,565 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain | 401,516 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain | 320,749 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain
Segment Reporting Segment Non Same Store Rental Income | 43,118 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain | 15,016 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain | 3,040 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain
Operating expenses: |  |  |
Same store | 138,605 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain | 137,667 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain | 103,925 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain
Non-same store/other | 17,755 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain | 6,846 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain | 1,179 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain
NOI: |  |  |
Same store | 281,960 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain | 263,849 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain | 216,824 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain
Non-same store/other | 25,363 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain | 8,170 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain | 1,861 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain
Southern California [Domain] | Same Store [Domain] |  |  |
NOI: |  |  |
Assets | 2,910,934 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 3,010,786 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 26,975 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 19,852 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Southern California [Domain] | Non-same store [Domain] |  |  |
NOI: |  |  |
Assets | 747,438 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 411,302 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 1,780 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 648 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_SouthernCaliforniaDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Washington DC [Domain] |  |  |
Rental income: |  |  |
Same store | 446,122 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain | 448,520 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain | 247,880 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain
Segment Reporting Segment Non Same Store Rental Income | 24,193 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain | 13,562 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain | 13,124 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain
Operating expenses: |  |  |
Same store | 143,800 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain | 140,708 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain | 75,580 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain
Non-same store/other | 7,936 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain | 4,086 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain | 3,984 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain
NOI: |  |  |
Same store | 302,322 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain | 307,812 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain | 172,300 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain
Non-same store/other | 16,257 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain | 9,476 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain | 9,140 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain
Washington DC [Domain] | Same Store [Domain] |  |  |
NOI: |  |  |
Assets | 4,223,590 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 4,339,246 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 42,927 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 24,506 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Washington DC [Domain] | Non-same store [Domain] |  |  |
NOI: |  |  |
Assets | 301,902 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 301,623 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 2,147 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 439 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_WashingtonDCDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Non-Core [Domain] |  |  |
Rental income: |  |  |
Same store | 100,732 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain | 97,380 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain | 128,816 eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain
Operating expenses: |  |  |
Same store | 37,451 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain | 36,483 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain | 48,548 eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain
NOI: |  |  |
Same store | 63,281 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain | 60,897 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain | 80,268 eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain
Non-Core [Domain] | Same Store [Domain] |  |  |
NOI: |  |  |
Assets | 408,486 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 427,108 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 5,675 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain | 3,528 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_NonCoreDomain / us-gaap_StatementScenarioAxis = eqr_SameStoreDomain |
Other [Domain] |  |  |
Rental income: |  |  |
Segment Reporting Segment Non Same Store Rental Income | 39,450 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain | 59,994 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain | 575 eqr_SegmentReportingSegmentNonSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain
Operating expenses: |  |  |
Non-same store/other | 13,735 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain | 34,903 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain | 17,695 eqr_SegmentReportingSegmentNonSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain
NOI: |  |  |
Non-same store/other | 25,715 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain | 25,091 eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain | (17,120)eqr_SegmentReportingInformationNonSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain
Other [Domain] | Non-same store [Domain] |  |  |
NOI: |  |  |
Assets | 1,946,408 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 1,720,711 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Payments to Acquire Other Property, Plant, and Equipment | 1,175 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain | 7,623 us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = eqr_OtherDomain / us-gaap_StatementScenarioAxis = eqr_NonsamestoreDomain |
Archstone pre-ownership [Member] |  |  |
Rental income: |  |  |
Same store |  | (92,423)eqr_SegmentReportingSegmentSameStoreRentalIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_ArchstonepreownershipMember |
Operating expenses: |  |  |
Same store |  | (36,729)eqr_SegmentReportingSegmentSameStoreOperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = eqr_ArchstonepreownershipMember |
NOI: |  |  |
Same store |  | $ (55,694)eqr_SegmentReportingInformationSameStoreNetOperatingIncome / us-gaap_StatementBusinessSegmentsAxis = eqr_ArchstonepreownershipMember |

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