XML 93 R73.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Real Estate and Lease Intangibles - Real Estate Acquisitions and Dispositions (Parenthetical) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) Property | Dec. 31, 2016 USD ($) Property
Real Estate [Line Items] |  |
Purchase Price | $ | $ 468,050 | $ 249,334
Properties disposed | Property | 5 | 99
Disposed Units | Property | 1,194 | 29,776
Sales Price | $ | $ 388,400 | $ 6,943,458
Unconsolidated Rental Properties [Member] |  |
Real Estate [Line Items] |  |
Properties disposed | Property |  | 1
Disposed Units | Property |  | 336
Sales Price | $ |  | $ 74,500
Equity Method Investment, Ownership Percentage |  | 20.00%
Distributions from unconsolidated entities - return of capital | $ |  | $ 12,400
Starwood Portfolio [Member] |  |
Real Estate [Line Items] |  |
Properties disposed | Property |  | 72
Disposed Units | Property |  | 23,262
Sales Price | $ |  | $ 5,365,000
Land [Member] |  |
Real Estate [Line Items] |  |
Purchase Price | $ | $ 68,300 | $ 98,000
Properties disposed | Property | 0 | 0
Disposed Units | Property | 0 | 0
Sales Price | $ | $ 33,450 | $ 57,455
Depreciable Property [Member] |  |
Real Estate [Line Items] |  |
Purchase Price | $ | 386,200 | 151,300
Rental Properties – Consolidated [Member] |  |
Real Estate [Line Items] |  |
Purchase Price | $ | $ 468,050 | $ 249,334
Properties disposed | Property | 5 | 98
Disposed Units | Property | 1,194 | 29,440
Sales Price | $ | $ 354,950 | $ 6,811,503
Rental Properties – Consolidated [Member] | Starwood Portfolio [Member] |  |
Real Estate [Line Items] |  |
Properties disposed | Property |  | 72
Disposed Units | Property |  | 23,262
Sales Price | $ |  | $ 5,365,000
Rental Properties – Consolidated [Member] | Ground Lease [Member] | Other Assets [Member] |  |
Real Estate [Line Items] |  |
Finite-Lived Intangible Asset, Off-market Lease, Favorable, Gross | $ | $ 13,700 |
Lease expiration year | 2113 |

X
- Definition The total number of rental properties that the Company disposed of to unaffiliated parties during the period. + References No definition available. + Details
Name: | eqr_DisposedProperties
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total number of rental units associated with rental properties that the company disposed of to unaffiliated third parties during the period. + References No definition available. + Details
Name: | eqr_DisposedUnits
Namespace Prefix: | eqr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lease expiration year. + References No definition available. + Details
Name: | eqr_LeaseExpirationYear
Namespace Prefix: | eqr_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow from distributions of capital received from unconsolidated joint ventures ( i.e proportionate share of proceeds and/or gain/loss from property sales). + References No definition available. + Details
Name: | eqr_ProceedsFromDistributionsReceivedFromUnconsolidatedSubsidiaries
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from the sale of real estate investment property. + References No definition available. + Details
Name: | eqr_ProceedsFromSaleOfProperty
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_FiniteLivedIntangibleAssetOffMarketLeaseFavorableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RealEstateLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=us-gaap_UnconsolidatedPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=eqr_StarwoodPortfolioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=eqr_DepreciablePropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=eqr_ConsolidatedRentalPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=eqr_GroundLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |