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CONSOLIDATED STATEMENT OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) (USD $)
In Thousands, unless otherwise specified
Total
PREFERRED UNITS
General Partner [Member]
Limited Partner [Member]
Accumulated Other Comprehensive (Loss)
Partially Owned Properties [Member]
Balance, beginning of year - Noncontrolling Interest at Dec. 31, 2014           $ 124,909us-gaap_PartnersCapitalAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_PartiallyOwnedPropertiesMember
Balance, beginning of year at Dec. 31, 2014   50,000eqr_PartnersCapitalAttributableToParent
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_PreferredStockMember
10,490,608eqr_PartnersCapitalAttributableToParent
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
214,411eqr_PartnersCapitalAttributableToParent
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
(172,152)eqr_PartnersCapitalAttributableToParent
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Partial redemption of 8.29% Series K Cumulative Redeemable (9,820)us-gaap_TreasuryStockValueAcquiredParValueMethod (9,820)us-gaap_TreasuryStockValueAcquiredParValueMethod
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_PreferredStockMember
       
OP Unit Issuance:            
Conversion of OP Units held by Limited Partners into OP Units held by General Partner     3,713eqr_ExchangeOfOPUnitsBetweenLimitedPartnerAndGeneralPartner
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
(3,713)eqr_ExchangeOfOPUnitsBetweenLimitedPartnerAndGeneralPartner
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
   
Exercise of EQR share options     32,213us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
     
EQR's Employee Share Purchase Plan (ESPP)     1,927us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
     
Share-based employee compensation expense:            
EQR restricted shares     6,722us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
     
EQR share options     997us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
     
EQR ESPP discount     412us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
     
Net income available to Units - General Partner     178,842us-gaap_NetIncomeLossAllocatedToGeneralPartners
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
     
OP Units - General Partner distributions     (201,032)eqr_GeneralPartnerDistribution
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
     
Supplemental Executive Retirement Plan (SERP)     (2,307)eqr_SupplementalExecutiveRetirementPlanSerp
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
     
Change in market value of Redeemable Limited Partners     (41,763)eqr_LimitedPartnersRedemptions
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
     
Adjustment for Limited Partners ownership in Operating Partnership     872eqr_AdjustmentForLimitedPartnersOwnershipInOperatingPartnership
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
(872)eqr_AdjustmentForLimitedPartnersOwnershipInOperatingPartnership
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
   
Issuance of restricted units to Noncontrolling Interests       1eqr_ContributionValueLongTermIncentivePlanUnit
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
   
Equity compensation associated with Units - Limited Partners       9,963us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
   
Net income available to Units - Limited Partners       7,059us-gaap_NetIncomeLossAllocatedToLimitedPartners
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
   
Units Limited Partners Distributions       7,913eqr_UnitsLimitedPartnersDistributions
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
   
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties 643eqr_AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties         643eqr_AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_PartiallyOwnedPropertiesMember
Distributions to Noncontrolling Interests           (2,891)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_PartiallyOwnedPropertiesMember
Change in carrying value (630)us-gaap_TemporaryEquityIssuePeriodIncreaseOrDecrease     630us-gaap_TemporaryEquityIssuePeriodIncreaseOrDecrease
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
   
Other comprehensive (loss) income – derivative instruments:            
Unrealized holding (losses) arising during the period (11,788)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax       (11,788)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Losses reclassified into earnings from other comprehensive income (4,338)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax       4,338us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Currency translation adjustments arising during the period (420)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax       (420)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Balance, end of period - Noncontrolling Interest at Mar. 31, 2015           122,661us-gaap_PartnersCapitalAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_PartiallyOwnedPropertiesMember
Balance, end of period at Mar. 31, 2015   $ 40,180eqr_PartnersCapitalAttributableToParent
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_PreferredStockMember
$ 10,471,204eqr_PartnersCapitalAttributableToParent
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
$ 219,566eqr_PartnersCapitalAttributableToParent
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
$ (180,022)eqr_PartnersCapitalAttributableToParent
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember