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Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
REVENUES |  |  |  |
Discontinued Operations - Rental income | $ 161 us-gaap_DisposalGroupIncludingDiscontinuedOperationRentalIncome |  | $ 1,023 us-gaap_DisposalGroupIncludingDiscontinuedOperationRentalIncome |
Discontinued Operations - Total revenue | 161 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue |  | 1,023 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue |
EXPENSES (1) |  |  |  |
Discontinued Operations - Property and maintenance | (67)eqr_DisposalGroupIncludingDiscontinuedOperationPropertyAndMaintenance | [1] | 48 eqr_DisposalGroupIncludingDiscontinuedOperationPropertyAndMaintenance | [1]
Discontinued Operations - Real estate taxes and insurance | 52 eqr_DisposalGroupIncludingDiscontinuedOperationRealEstateTaxesAndInsurance | [1] | 13 eqr_DisposalGroupIncludingDiscontinuedOperationRealEstateTaxesAndInsurance | [1]
Discontinued Operations - General and administrative | 6 us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense | [1] | 5 us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense | [1]
Discontinued Operations - Total expenses | (9)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense | [1] | 66 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense | [1]
Discontinued operating income | 170 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss |  | 957 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss |
Discontinued Operations - Interest and other income | 49 eqr_DisposalGroupIncludingDiscontinuedOperationInterestAndOtherIncome |  | 35 eqr_DisposalGroupIncludingDiscontinuedOperationInterestAndOtherIncome |
Discontinued Operations - Income and other tax (expense) benefit | (15)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation |  | (11)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation |
Income Loss From Discontinued Operations | 204 eqr_IncomeLossFromDiscontinuedOperations |  | 981 eqr_IncomeLossFromDiscontinuedOperations |
Discontinued Operation - Net gain on sales of discontinued operations | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | 71 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |
Discontinued operations, net | $ 204 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | $ 1,052 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
[1] | Includes expenses paid in the current period for properties sold in prior periods related to the Company’s period of ownership.

X
- 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 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 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 general and administrative expense attributable to disposal group. + 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 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 rental income attributable to the disposal group, including a component of the entity (discontinued operation). + References No definition available. + 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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