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Real Estate and Lease Intangibles - Summary of Carrying Amounts of Above and Below Market Ground And Retail Lease Intangibles (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Other Assets [Member] |  |
Lease intangible assets | $ 193,178 | $ 193,178
Finite-Lived Intangible Assets, Accumulated Amortization | (23,562) | (22,434)
Lease intangible assets, net | 169,616 | 170,744
Other Assets [Member] | Ground Lease [Member] |  |
Finite-Lived Intangible Asset, Off-market Lease, Favorable, Gross | 191,918 | 191,918
Other Assets [Member] | Retail Lease [Member] |  |
Finite-Lived Intangible Asset, Off-market Lease, Favorable, Gross | 1,260 | 1,260
Other Liabilities [Member] |  |
Lease Intangible Liabilities | 7,670 | 7,670
Finite Lived Intangible Liabilities Accumulated Amortization | (5,173) | (5,143)
Lease intangible liabilities, net | 2,497 | 2,527
Other Liabilities [Member] | Ground Lease [Member] |  |
Finite-Lived Intangible Liabilities, Off-market Lease, Unfavorable, Gross | 2,400 | 2,400
Other Liabilities [Member] | Retail Lease [Member] |  |
Finite-Lived Intangible Liabilities, Off-market Lease, Unfavorable, Gross | $ 5,270 | $ 5,270

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- Definition The accumulated amount of amortization of a major finite-lived intangible liabilities class. + References No definition available. + Details
Name: | eqr_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of acquisition cost of a business combination allocated to total lease intangible liabilities that will be amortized. + References No definition available. + Details
Name: | eqr_LeaseIntangibleLiabilities
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of acquisition cost of a business combination allocated to total lease intangible liabilities, net of amortization. + References No definition available. + Details
Name: | eqr_LeaseIntangibleLiabilitiesnet
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This element represents the identifiable intangible asset established upon acquisition based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date. + 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 210.5-02.15) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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X
- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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X
- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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X
- Definition This element represents a liability associated with the acquisition of an off-market lease when the terms of the lease are unfavorable to the market terms for the lease at the date of acquisition. + 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 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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- Details
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