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Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
REVENUES |  |  |
Disposal Group Including Discontinued Operation Rental Revenue | $ 1,309 eqr_DisposalGroupIncludingDiscontinuedOperationRentalRevenue | $ 121,942 eqr_DisposalGroupIncludingDiscontinuedOperationRentalRevenue | $ 445,832 eqr_DisposalGroupIncludingDiscontinuedOperationRentalRevenue
Disposal Group, Including Discontinued Operation, Revenue | 1,309 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | 121,942 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | 445,832 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
EXPENSES |  |  |
Disposal Group Including Discontinued Operation Property And Maintenance | (141)eqr_DisposalGroupIncludingDiscontinuedOperationPropertyAndMaintenance | 36,792 eqr_DisposalGroupIncludingDiscontinuedOperationPropertyAndMaintenance | 103,371 eqr_DisposalGroupIncludingDiscontinuedOperationPropertyAndMaintenance
Disposal Group Including Discontinued Operation Real Estate Taxes And Insurance | 267 eqr_DisposalGroupIncludingDiscontinuedOperationRealEstateTaxesAndInsurance | 11,903 eqr_DisposalGroupIncludingDiscontinuedOperationRealEstateTaxesAndInsurance | 41,208 eqr_DisposalGroupIncludingDiscontinuedOperationRealEstateTaxesAndInsurance
Disposal Group Including Discontinued Operations Property Management | 0 eqr_DisposalGroupIncludingDiscontinuedOperationsPropertyManagement | 1 eqr_DisposalGroupIncludingDiscontinuedOperationsPropertyManagement | 211 eqr_DisposalGroupIncludingDiscontinuedOperationsPropertyManagement
Disposal Group Including Discontinued Operation Depreciation | 0 eqr_DisposalGroupIncludingDiscontinuedOperationDepreciation | 34,380 eqr_DisposalGroupIncludingDiscontinuedOperationDepreciation | 124,323 eqr_DisposalGroupIncludingDiscontinuedOperationDepreciation
Disposal Group Including Discontinued Operation General And Administrative | 89 eqr_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrative | 85 eqr_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrative | 92 eqr_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrative
Disposal Group, Including Discontinued Operation, Operating Expense | 215 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense | 83,161 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense | 269,205 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense
Disposal Group, Including Discontinued Operation, Operating Income (Loss) | 1,094 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss | 38,781 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss | 176,627 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss
Disposal Group Including Discontinued Operation Interest And Other Income | 317 eqr_DisposalGroupIncludingDiscontinuedOperationInterestAndOtherIncome | 217 eqr_DisposalGroupIncludingDiscontinuedOperationInterestAndOtherIncome | 156 eqr_DisposalGroupIncludingDiscontinuedOperationInterestAndOtherIncome
Disposal Group Including Discontinued Operation Other Expenses | 0 eqr_DisposalGroupIncludingDiscontinuedOperationOtherExpenses | (3)eqr_DisposalGroupIncludingDiscontinuedOperationOtherExpenses | (170)eqr_DisposalGroupIncludingDiscontinuedOperationOtherExpenses
Interest: |  |  |
Expense incurred, net | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense | (1,296)us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense | (3,811)us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense
Disposal Group Including Discontinued Operation Amortization Of Deferred Financing Costs | 0 eqr_DisposalGroupIncludingDiscontinuedOperationAmortizationOfDeferredFinancingCosts | (228)eqr_DisposalGroupIncludingDiscontinuedOperationAmortizationOfDeferredFinancingCosts | (140)eqr_DisposalGroupIncludingDiscontinuedOperationAmortizationOfDeferredFinancingCosts
Discontinued Operation, Tax Effect of Discontinued Operation | (8)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | (449)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | (34)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Income Loss From Discontinued Operations | 1,403 eqr_IncomeLossFromDiscontinuedOperations | 37,022 eqr_IncomeLossFromDiscontinuedOperations | 172,628 eqr_IncomeLossFromDiscontinuedOperations
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax | (179)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | (2,036,505)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | (548,278)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Discontinued operations, net | $ 1,582 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 2,073,527 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 720,906 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax

X
- Definition The component of interest expense comprised of the periodic charge against earnings over the life of the financing arrangement for cash outflows paid to third parties in connection with debt origination that is attributable to the disposal group. + References No definition available. + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives that is attributable to the disposal group. Includes production and non-production related depreciation. + References No definition available. + Details
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- Definition The aggregate total of expenses that are attributable to the disposal group for managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition The amount of interest income and other income recognized during the period attributable to the disposal group, including a component of the entity (discontinued operation). + References No definition available. + Details
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- Definition Any other expense items resulting from secondary business-related activities, excluding those considered part of the normal operations of the business that have not been previously categorized that are attributable to the disposal group. + References No definition available. + Details
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- Definition The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property that are attributable to the disposal group. + References No definition available. + Details
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- Definition The aggregate total of real estate taxes and insurance expense that is attributable to the disposal group. + References No definition available. + Details
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- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue that is attributable to the disposal group. + References No definition available. + Details
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- Definition The aggregate total of property management expense that is attributable to the disposal group. + References No definition available. + Details
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- Definition This element represents the income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items, the cumulative effect of accounting changes before deduction or consideration of the amount which may be allocable to noncontrolling interests, if any, and gain (loss) on disposal. + References No definition available. + Details
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- Definition Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e38679-109324 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 + Details
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- Definition Amount of interest expense allocated to disposal group, including a discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section S99 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26872618&loc=d3e7436-122677 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1063-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1060-107759 + Details
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- Definition Amount of operating expenses attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of operating income or loss attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.14) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 5 + Details
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