XML 86 R11.htm IDEA: XBRL DOCUMENT
v2.4.1.9

CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (USD $) In Thousands, unless otherwise specified | Total | Preferred Stock [Member] | COMMON SHARES, $0.01 PAR VALUE | PAID IN CAPITAL | Retained Earnings [Member] | ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME | OPERATING PARTNERSHIP | Partially Owned Properties [Member] | Series N Preferred Stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance, Noncontrolling Interest at Dec. 31, 2011 |  |  |  |  |  |  | $ 119,536 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember | $ 74,306 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Balance, beginning of year at Dec. 31, 2011 |  | 200,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 2,975 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 5,047,186 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 615,572 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (196,718)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Preferred Shares |  |  |  |  |  |  |  |  |
Preferred Stock Preference Units Dividend Rate Percentage |  |  |  |  |  |  |  |  | 6.48%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / us-gaap_StatementClassOfStockAxis = eqr_SeriesNPreferredStockMember
Redemption of 6.48% Series N Cumulative Redeemable | 150,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock | (150,000)us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  |  |  | 150,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = eqr_SeriesNPreferredStockMember
Common Share Issuance: |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 7 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 18,922 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (18,929)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Issuance of Common Shares | 192,300 us-gaap_StockIssuedDuringPeriodValueNewIssues |  | 250 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,388,333 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Exercise of share options |  |  | 16 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 49,023 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 1 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 5,398 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Restricted shares |  |  | 2 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 8,934 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Share options |  |  |  | 11,752 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
ESPP discount |  |  |  | 965 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Common Shares repurchsed and retired |  |  |  | 0 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Offering costs |  |  |  | (39,359)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Premium on redemption of Preferred Shares - original issuance costs |  |  |  | 5,129 eqr_PremiumOnRedemptionOfPreferredSharesPreferenceUnitsOriginalIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (5,129)eqr_PremiumOnRedemptionOfPreferredSharesPreferenceUnitsOriginalIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | 5,100 eqr_PremiumOnRedemptionOfPreferredSharesPreferenceUnitsOriginalIssuance / us-gaap_StatementClassOfStockAxis = eqr_SeriesNPreferredStockMember
Supplemental Executive Retirement Plan (SERP) |  |  |  | 282 eqr_SupplementalExecutiveRetirementPlanSerp / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Acquisition of Noncontrolling Interests - Partially Owned Properties | 13 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties |  |  | 1,293 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (1,306)eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 5,763 us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (5,763)us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Retained Earnings |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 841,719 us-gaap_NetIncomeLoss |  |  |  | 841,719 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Common Share distributions |  |  |  |  | (554,429)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Preferred Share distributions |  |  |  |  | (10,355)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Premium on redemption of Preferred Shares - cash charge | 23 eqr_PremiumOnRedemptionOfPreferredSharesCash |  |  |  | (23)eqr_PremiumOnRedemptionOfPreferredSharesCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Accumulated other comprehensive (loss) income - derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding (losses) gains arising during the year | (11,772)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  |  | (11,772)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Losses reclassified into earnings from other comprehensive income | (14,678)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax |  |  |  |  | 14,678 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Accumulated other comprehensive income (loss) - other instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains arising during the year | 664 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  |  | 664 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
(Gains) realized during the year | 0 us-gaap_GainLossOnSaleOfSecuritiesNet |  |  |  |  | 0 us-gaap_GainLossOnSaleOfSecuritiesNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Currency translation adjustments arising during the year | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership | (38,734)us-gaap_MinorityInterestChangeInRedemptionValue |  |  | 38,734 us-gaap_MinorityInterestChangeInRedemptionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Operating Partnership |  |  |  |  |  |  |  |  |
Issuance of OP Units to Noncontrolling Interests |  |  |  |  |  |  | 66,606 eqr_IssuanceOfOpUnitsToNoncontrollingInterests / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Issuance restricted units to Noncontrolling Interests |  |  |  |  |  |  | 5 eqr_IssuanceOfLongTermIncentivePlanUnitsIntoNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Equity Compensation associated with Noncontrolling Interests |  |  |  |  |  |  | 5,307 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 881,204 us-gaap_ProfitLoss |  |  |  |  |  | 38,641 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember | 844 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (25,095)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember | (5,131)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership | 20,702 eqr_MinorityInterestChangeInCarryingValue |  |  |  |  |  | (20,702)eqr_MinorityInterestChangeInCarryingValue / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Partially Owned Properties |  |  |  |  |  |  |  |  |
Contributions - Noncontrolling Interests - Partially Owned Properties | 8,221 us-gaap_ProceedsFromMinorityShareholders |  |  |  |  |  |  | 8,221 us-gaap_ProceedsFromMinorityShareholders / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Archstone of Archstone |  |  |  |  |  |  |  | 0 eqr_ArchstoneAcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Acquisition Noncontrolling Interests - Partially Owned Properties | 13 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties |  |  | 1,293 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (1,306)eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Other |  |  |  |  |  |  |  | 754 us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Ending Balance, Noncontrolling Interest at Dec. 31, 2012 |  |  |  |  |  |  | 159,606 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember | 77,688 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Balance, end of year at Dec. 31, 2012 |  | 50,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 3,251 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 6,542,355 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 887,355 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (193,148)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Preferred Shares |  |  |  |  |  |  |  |  |
Preferred Stock Preference Units Dividend Rate Percentage |  |  |  |  |  |  |  |  | 6.48%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / us-gaap_StatementClassOfStockAxis = eqr_SeriesNPreferredStockMember
Redemption of 6.48% Series N Cumulative Redeemable | 0 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock | 0 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  |  |  |
Common Share Issuance: |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 1 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,698 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (1,699)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Issuance of Common Shares |  |  | 345 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,929,523 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Exercise of share options |  |  | 5 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 17,247 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 1 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,400 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Restricted shares |  |  | 2 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 13,262 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Share options |  |  |  | 10,514 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
ESPP discount |  |  |  | 632 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Common Shares repurchsed and retired |  |  |  | 0 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Offering costs |  |  |  | (1,047)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Premium on redemption of Preferred Shares - original issuance costs |  |  |  | 0 eqr_PremiumOnRedemptionOfPreferredSharesPreferenceUnitsOriginalIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 eqr_PremiumOnRedemptionOfPreferredSharesPreferenceUnitsOriginalIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | (422)eqr_SupplementalExecutiveRetirementPlanSerp / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Acquisition of Noncontrolling Interests - Partially Owned Properties | 0 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties |  |  | 0 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 0 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | (35,329)us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 35,329 us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Retained Earnings |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 1,830,613 us-gaap_NetIncomeLoss |  |  |  | 1,830,613 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Common Share distributions |  |  |  |  | (666,565)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Preferred Share distributions |  |  |  |  | (4,145)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Premium on redemption of Preferred Shares - cash charge | 0 eqr_PremiumOnRedemptionOfPreferredSharesCash |  |  |  | 0 eqr_PremiumOnRedemptionOfPreferredSharesCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Accumulated other comprehensive (loss) income - derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding (losses) gains arising during the year | 18,771 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  |  | 18,771 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Losses reclassified into earnings from other comprehensive income | (20,141)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax |  |  |  |  | 20,141 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Accumulated other comprehensive income (loss) - other instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains arising during the year | 583 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  |  | 583 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
(Gains) realized during the year | (2,122)us-gaap_GainLossOnSaleOfSecuritiesNet |  |  |  |  | (2,122)us-gaap_GainLossOnSaleOfSecuritiesNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Currency translation adjustments arising during the year | 613 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax |  |  |  |  | 613 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership | (79,667)us-gaap_MinorityInterestChangeInRedemptionValue |  |  | 79,667 us-gaap_MinorityInterestChangeInRedemptionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Operating Partnership |  |  |  |  |  |  |  |  |
Issuance of OP Units to Noncontrolling Interests |  |  |  |  |  |  | 0 eqr_IssuanceOfOpUnitsToNoncontrollingInterests / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Issuance restricted units to Noncontrolling Interests |  |  |  |  |  |  | 5 eqr_IssuanceOfLongTermIncentivePlanUnitsIntoNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Equity Compensation associated with Noncontrolling Interests |  |  |  |  |  |  | 13,609 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 1,905,353 us-gaap_ProfitLoss |  |  |  |  |  | 75,278 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember | (538)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (26,277)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember | (6,490)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership | 44,439 eqr_MinorityInterestChangeInCarryingValue |  |  |  |  |  | (44,439)eqr_MinorityInterestChangeInCarryingValue / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Partially Owned Properties |  |  |  |  |  |  |  |  |
Contributions - Noncontrolling Interests - Partially Owned Properties | 27,660 us-gaap_ProceedsFromMinorityShareholders |  |  |  |  |  |  | 27,660 us-gaap_ProceedsFromMinorityShareholders / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Archstone of Archstone |  |  |  |  |  |  |  | 28,263 eqr_ArchstoneAcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Acquisition Noncontrolling Interests - Partially Owned Properties | 0 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties |  |  | 0 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 0 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Other |  |  |  |  |  |  |  | 0 us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Ending Balance, Noncontrolling Interest at Dec. 31, 2013 | 10,845,196 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  |  |  | 211,412 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember | 126,583 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Balance, end of year at Dec. 31, 2013 | 10,507,201 us-gaap_StockholdersEquity | 50,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 3,605 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 8,561,500 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 2,047,258 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (155,162)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Preferred Shares |  |  |  |  |  |  |  |  |
Preferred Stock Preference Units Dividend Rate Percentage |  |  |  |  |  |  |  |  | 6.48%eqr_PreferredStockPreferenceUnitsDividendRatePercentage / us-gaap_StatementClassOfStockAxis = eqr_SeriesNPreferredStockMember
Redemption of 6.48% Series N Cumulative Redeemable | 0 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock | 0 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  |  |  |
Common Share Issuance: |  |  |  |  |  |  |  |  |
Conversion of OP Units into Common Shares |  |  | 1 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,364 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (2,365)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Issuance of Common Shares |  |  | 0 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Exercise of share options |  |  | 21 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 82,552 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Employee Share Purchase Plan (ESPP) |  |  | 0 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,392 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Restricted shares |  |  | 2 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 9,902 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Share-based employee compensation expense: |  |  |  |  |  |  |  |  |
Share options |  |  |  | 7,349 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
ESPP discount |  |  |  | 859 us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Common Shares repurchsed and retired |  |  |  | (1,777)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Offering costs |  |  |  | (41)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Premium on redemption of Preferred Shares - original issuance costs |  |  |  | 0 eqr_PremiumOnRedemptionOfPreferredSharesPreferenceUnitsOriginalIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 eqr_PremiumOnRedemptionOfPreferredSharesPreferenceUnitsOriginalIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  | 7,374 eqr_SupplementalExecutiveRetirementPlanSerp / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Acquisition of Noncontrolling Interests - Partially Owned Properties | 5,501 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties |  |  | (2,308)eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (2,244)eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Adjustment for Noncontrolling Interests ownership in Operating Partnership |  |  |  | 4,992 us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (4,992)us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Retained Earnings |  |  |  |  |  |  |  |  |
Net income attributable to controlling interests | 631,308 us-gaap_NetIncomeLoss |  |  |  | 631,308 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Common Share distributions |  |  |  |  | (723,782)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Preferred Share distributions |  |  |  |  | (4,145)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Premium on redemption of Preferred Shares - cash charge | 0 eqr_PremiumOnRedemptionOfPreferredSharesCash |  |  |  | 0 eqr_PremiumOnRedemptionOfPreferredSharesCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Accumulated other comprehensive (loss) income - derivative instruments: |  |  |  |  |  |  |  |  |
Unrealized holding (losses) gains arising during the year | (33,306)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  |  | (33,306)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Losses reclassified into earnings from other comprehensive income | (16,868)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax |  |  |  |  | 16,868 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Accumulated other comprehensive income (loss) - other instruments: |  |  |  |  |  |  |  |  |
Unrealized holding gains arising during the year | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
(Gains) realized during the year | 0 us-gaap_GainLossOnSaleOfSecuritiesNet |  |  |  |  | 0 us-gaap_GainLossOnSaleOfSecuritiesNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Currency translation adjustments arising during the year | (552)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax |  |  |  |  | (552)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership | 139,818 us-gaap_MinorityInterestChangeInRedemptionValue |  |  | (139,818)us-gaap_MinorityInterestChangeInRedemptionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Operating Partnership |  |  |  |  |  |  |  |  |
Issuance of OP Units to Noncontrolling Interests |  |  |  |  |  |  | 0 eqr_IssuanceOfOpUnitsToNoncontrollingInterests / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Issuance restricted units to Noncontrolling Interests |  |  |  |  |  |  | 3 eqr_IssuanceOfLongTermIncentivePlanUnitsIntoNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Equity Compensation associated with Noncontrolling Interests |  |  |  |  |  |  | 11,969 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 658,683 us-gaap_ProfitLoss |  |  |  |  |  | 24,831 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember | 2,544 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Distributions to Noncontrolling Interests |  |  |  |  |  |  | (28,676)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember | (7,827)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership | (2,229)eqr_MinorityInterestChangeInCarryingValue |  |  |  |  |  | 2,229 eqr_MinorityInterestChangeInCarryingValue / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember |  |
Partially Owned Properties |  |  |  |  |  |  |  |  |
Contributions - Noncontrolling Interests - Partially Owned Properties | 5,684 us-gaap_ProceedsFromMinorityShareholders |  |  |  |  |  |  | 5,684 us-gaap_ProceedsFromMinorityShareholders / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Archstone of Archstone |  |  |  |  |  |  |  | 0 eqr_ArchstoneAcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Acquisition Noncontrolling Interests - Partially Owned Properties | 5,501 eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties |  |  | (2,308)eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (2,244)eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Other |  |  |  |  |  |  |  | 169 us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Ending Balance, Noncontrolling Interest at Dec. 31, 2014 | 10,707,776 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  |  |  | 214,411 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PartnershipInterestMember | 124,909 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PartiallyOwnedPropertiesMember |
Balance, end of year at Dec. 31, 2014 | $ 10,368,456 us-gaap_StockholdersEquity | $ 50,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 3,629 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 8,536,340 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 1,950,639 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (172,152)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |

X
- Definition (Reduction to) increase in paid in capital (included in general partner's capital) due to Units issued to noncontrolling interests as a result of an acquisition and/or the buy out of a joint venture partner's interest during the period. + References No definition available. + Details
Name: | eqr_AcquisitionNoncontrollingInterestsPartiallyOwnedProperties
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition (Reduction to) increase in paid in capital (included in general partner's capital) due to acquisition of noncontrolling interests as a result of the acquisition of Archstone's interest in joint ventures during the period. + References No definition available. + Details
Name: | eqr_ArchstoneAcquisitionNoncontrollingInterestsPartiallyOwnedProperties
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | eqr_InvestmentsInPartiallyOwnedEntitiesAbstract
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of long term incentive plan units issued during the period. + References No definition available. + Details
Name: | eqr_IssuanceOfLongTermIncentivePlanUnitsIntoNoncontrollingInterest
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Value of OP Units issued during the period as a result of an acquisition. + References No definition available. + Details
Name: | eqr_IssuanceOfOpUnitsToNoncontrollingInterests
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the change in the proportional relationship between the carrying values of equity associated with common shares relative to that of the noncontrolling interests. + References No definition available. + Details
Name: | eqr_MinorityInterestChangeInCarryingValue
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | eqr_PreferredSharesAbstract
Namespace Prefix: | eqr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage rate used to calculate dividend payments on preferred shares/preference units. + References No definition available. + Details
Name: | eqr_PreferredStockPreferenceUnitsDividendRatePercentage
Namespace Prefix: | eqr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The premium on the redemption of Preferred Shares/Preference Units recognized in relation to cash charged for agent fees and other professional services. + References No definition available. + Details
Name: | eqr_PremiumOnRedemptionOfPreferredSharesCash
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The write-off of original issuance costs as a premium on the redemption of Preferred Shares/Preference Units. + References No definition available. + Details
Name: | eqr_PremiumOnRedemptionOfPreferredSharesPreferenceUnitsOriginalIssuance
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Change in the value of company common shares contained in the company's supplemental executive retirement plan. + References No definition available. + Details
Name: | eqr_SupplementalExecutiveRetirementPlanSerp
Namespace Prefix: | eqr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the amount of recognized equity-based compensation related to employee stock purchase programs during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). + References No definition available. + Details
Name: | us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the amount of recognized equity-based compensation related to other long-term incentive plans during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). + References No definition available. + Details
Name: | us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationOtherLongtermIncentivePlansRequisiteServicePeriodRecognition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of equity-based compensation, related to restricted stock units or restricted stock awards, recognized as expense or an asset, if compensation is capitalized. + References No definition available. + Details
Name: | us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the amount of recognized equity-based compensation related to stock options during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). + References No definition available. + Details
Name: | us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_DividendsCommonStockCash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
Name: | us-gaap_DividendsPreferredStockCash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Subparagraph h -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Article 7 + Details
Name: | us-gaap_GainLossOnSaleOfSecuritiesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest. + References No definition available. + Details
Name: | us-gaap_MinorityInterestChangeInRedemptionValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
Name: | us-gaap_NetIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase in noncontrolling interest from subsidiary issuance of equity interests to noncontrolling interest holders. + References No definition available. + Details
Name: | us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

X
- Definition Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32157-110900 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a-c) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41638-113959 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
Name: | us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition The cash outflow to reacquire preferred stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
Name: | us-gaap_ProceedsFromMinorityShareholders
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686 + Details
Name: | us-gaap_ProfitLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

X
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
Name: | us-gaap_StockholdersEquity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4568447-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4568740-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4590271-111686 + Details
Name: | us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy. + References No definition available. + Details
Name: | us-gaap_StockholdersEquityOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Value of stock issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
Name: | us-gaap_StockIssuedDuringPeriodValueConversionOfUnits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Aggregate change in value for stock issued during the period as a result of employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
Name: | us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
Name: | us-gaap_StockIssuedDuringPeriodValueNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Value of stock issued as a result of the exercise of stock options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
Name: | us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
Name: | us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration