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v2.4.1.9

Deposits - Restricted (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Restricted Cash and Cash Equivalents Items [Line Items] |  |
Tax-deferred (1031) exchange proceeds | $ 136,602 eqr_TaxDeferredExchangeProceeds | $ 0 eqr_TaxDeferredExchangeProceeds
Earnest money on pending acquisitions | 2,830 us-gaap_EarnestMoneyDeposits | 580 us-gaap_EarnestMoneyDeposits
Restricted deposits on real estate investments | 17,636 eqr_RestrictedDepositsOnRealEstateInvestments | 24,701 eqr_RestrictedDepositsOnRealEstateInvestments
Resident security and utility deposits | 46,225 eqr_ResidentSecurityAndUtilityDeposits | 46,516 eqr_ResidentSecurityAndUtilityDeposits
Other Restricted Cash | 507 eqr_OtherRestrictedCash | 506 eqr_OtherRestrictedCash
Restricted Cash and Cash Equivalents | 203,800 us-gaap_RestrictedCashAndCashEquivalents | 72,303 us-gaap_RestrictedCashAndCashEquivalents
Escrow deposits for real estate taxes and insurance | 2,691 us-gaap_EscrowDeposit | 2,235 us-gaap_EscrowDeposit
Replacement reserve | 3,490 us-gaap_ReplacementReserveEscrow | 3,431 us-gaap_ReplacementReserveEscrow
Mortgage principal reserves/sinking funds | 43,626 us-gaap_DebtInstrumentCumulativeSinkingFundPayments | 41,567 us-gaap_DebtInstrumentCumulativeSinkingFundPayments
Escrow deposits - other | 852 eqr_Escrowdepositsother | 852 eqr_Escrowdepositsother
Escrow Deposits For Mortgage And Replacement Reserves | $ 50,659 eqr_EscrowDepositsForMortgageAndReplacementReserves | $ 48,085 eqr_EscrowDepositsForMortgageAndReplacementReserves

X
- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes, insurance and replacement reserve obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. + References No definition available. + Details
Name: | eqr_EscrowDepositsForMortgageAndReplacementReserves
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Other escrow deposits items not otherwise listed in the existing taxonomy that are pledged or subject to withdrawal restrictions. + References No definition available. + Details
Name: | eqr_Escrowdepositsother
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Other cash and cash items not otherwise listed in the existing taxonomy that are pledged or subject to withdrawal restrictions. + References No definition available. + Details
Name: | eqr_OtherRestrictedCash
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Restricted cash and cash items pertaining to security deposits and utility deposits from residents. + References No definition available. + Details
Name: | eqr_ResidentSecurityAndUtilityDeposits
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Restricted cash and cash items primarily pertaining to deposits held by a joint venture to collateralize construction guarantees or miscellaneous deposits held in escrow that were assumed in conjunction with a business combination. + References No definition available. + Details
Name: | eqr_RestrictedDepositsOnRealEstateInvestments
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Restricted cash and cash items pertaining to "like-kind" exchanges (i.e. the proceeds from the previous sale of a property are used in part or in whole to acquire a new (replacement) property). + References No definition available. + Details
Name: | eqr_TaxDeferredExchangeProceeds
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cumulative amount paid into a fund, which is used to retire the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 + Details
Name: | us-gaap_DebtInstrumentCumulativeSinkingFundPayments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition A deposit made by a purchaser of real estate to evidence good faith. It is customary for a buyer to give the seller earnest money at the time a sales contract is signed. The earnest money generally is credited to the down payment at closing, which is applied at closing as a component of payment against the purchase price. + References No definition available. + Details
Name: | us-gaap_EarnestMoneyDeposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_EscrowDeposit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents those amounts set aside for the repair and replacement of real or personal property in the foreseen future. Such amount may be funded from sales revenue (for example; timeshare sales) or operating revenues; in a lump sum or installments (such as monthly); as per internal policy (for example: hotel operators), as required by contractual agreement (for example: sales contract); or by the terms of debt agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.2,10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_ReplacementReserveEscrow
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration