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v2.4.1.9

Deposits - Restricted (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Restricted Cash and Cash Equivalents Items [Line Items] |  |
Earnest Money On Pending Acquisitions | $ 580 eqr_EarnestMoneyOnAcquisitions | $ 4,514 eqr_EarnestMoneyOnAcquisitions
Restricted deposits on real estate investments | 24,701 eqr_RestrictedDepositsOnRealEstateInvestments | 53,771 eqr_RestrictedDepositsOnRealEstateInvestments
Resident security and utility deposits | 46,516 eqr_ResidentSecurityAndUtilityDeposits | 44,777 eqr_ResidentSecurityAndUtilityDeposits
Other Restricted Cash | 506 eqr_OtherRestrictedCash | 505 eqr_OtherRestrictedCash
Restricted Cash and Cash Equivalents | 72,303 us-gaap_RestrictedCashAndCashEquivalents | 103,567 us-gaap_RestrictedCashAndCashEquivalents
Escrow Deposit | 2,235 us-gaap_EscrowDeposit | 3,687 us-gaap_EscrowDeposit
Replacement Reserve Escrow | 3,431 us-gaap_ReplacementReserveEscrow | 4,229 us-gaap_ReplacementReserveEscrow
Debt Instrument, Cumulative Sinking Fund Payments | 41,567 us-gaap_DebtInstrumentCumulativeSinkingFundPayments | 33,868 us-gaap_DebtInstrumentCumulativeSinkingFundPayments
Escrow deposits - other | 852 eqr_Escrowdepositsother | 852 eqr_Escrowdepositsother
Escrow Deposits For Mortgage And Replacement Reserves | $ 48,085 eqr_EscrowDepositsForMortgageAndReplacementReserves | $ 42,636 eqr_EscrowDepositsForMortgageAndReplacementReserves

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- Definition Restricted cash and cash items pertaining to deposits submitted with an offer to show good faith to follow through with the purchase of a property. + References No definition available. + Details
Name: | eqr_EarnestMoneyOnAcquisitions
Namespace Prefix: | eqr_
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, 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 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 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