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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 |  |  |  |  |  | $ 124,909 us-gaap_PartnersCapitalAttributableToNoncontrollingInterest / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember
Balance, beginning of year at Dec. 31, 2014 |  | 50,000 eqr_PartnersCapitalAttributableToParent / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PreferredStockMember | 10,490,608 eqr_PartnersCapitalAttributableToParent / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | 214,411 eqr_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 |  |  | 3,713 eqr_ExchangeOfOPUnitsBetweenLimitedPartnerAndGeneralPartner / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | (3,713)eqr_ExchangeOfOPUnitsBetweenLimitedPartnerAndGeneralPartner / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |
Exercise of EQR share options |  |  | 32,213 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |
EQR's Employee Share Purchase Plan (ESPP) |  |  | 1,927 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |
Share-based employee compensation expense: |  |  |  |  |  |
EQR restricted shares |  |  | 6,722 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |
EQR share options |  |  | 997 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |
EQR ESPP discount |  |  | 412 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember |  |  |
Net income available to Units - General Partner |  |  | 178,842 us-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 |  |  | 872 eqr_AdjustmentForLimitedPartnersOwnershipInOperatingPartnership / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | (872)eqr_AdjustmentForLimitedPartnersOwnershipInOperatingPartnership / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |
Issuance of restricted units to Noncontrolling Interests |  |  |  | 1 eqr_ContributionValueLongTermIncentivePlanUnit / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |
Equity compensation associated with Units - Limited Partners |  |  |  | 9,963 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |
Net income available to Units - Limited Partners |  |  |  | 7,059 us-gaap_NetIncomeLossAllocatedToLimitedPartners / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |
Units Limited Partners Distributions |  |  |  | 7,913 eqr_UnitsLimitedPartnersDistributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember |  |
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties | 643 eqr_AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties |  |  |  |  | 643 eqr_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 |  |  | 630 us-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 |  |  |  | 4,338 us-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 |  |  |  |  |  | 122,661 us-gaap_PartnersCapitalAttributableToNoncontrollingInterest / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember
Balance, end of period at Mar. 31, 2015 |  | $ 40,180 eqr_PartnersCapitalAttributableToParent / us-gaap_PartnerCapitalComponentsAxis = us-gaap_PreferredStockMember | $ 10,471,204 eqr_PartnersCapitalAttributableToParent / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | $ 219,566 eqr_PartnersCapitalAttributableToParent / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember | $ (180,022)eqr_PartnersCapitalAttributableToParent / us-gaap_PartnerCapitalComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |

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