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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net income | $ 658,683 us-gaap_ProfitLoss | $ 1,905,353 us-gaap_ProfitLoss | $ 881,204 us-gaap_ProfitLoss
Other comprehensive (loss) income - derivative instruments: |  |  |
Unrealized holding (losses) gains arising during the year | (33,306)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | 18,771 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | (11,772)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Losses reclassified into earnings from other comprehensive income | (16,868)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax | (20,141)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax | (14,678)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Other comprehensive income (loss) - other instruments: |  |  |
Unrealized holding gains arising during the year | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 583 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 664 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
(Gains) realized during the year | 0 us-gaap_GainLossOnSaleOfSecuritiesNet | (2,122)us-gaap_GainLossOnSaleOfSecuritiesNet | 0 us-gaap_GainLossOnSaleOfSecuritiesNet
Other comprehensive (loss) income – foreign currency: |  |  |
Currency translation adjustments arising during the year | (552)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | 613 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Other comprehensive (loss) income | (16,990)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 37,986 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 3,570 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income | 641,693 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 1,943,339 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 884,774 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest | 26,728 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | 76,204 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | 39,624 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income attributable to controlling interests | 614,965 us-gaap_ComprehensiveIncomeNetOfTax | 1,867,135 us-gaap_ComprehensiveIncomeNetOfTax | 845,150 us-gaap_ComprehensiveIncomeNetOfTax
Partnership Interest [Member] |  |  |
Net income | 658,683 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 1,905,353 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 881,204 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Other comprehensive (loss) income - derivative instruments: |  |  |
Unrealized holding (losses) gains arising during the year | (33,306)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 18,771 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | (11,772)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Losses reclassified into earnings from other comprehensive income | (16,868)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | (20,141)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | (14,678)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Other comprehensive income (loss) - other instruments: |  |  |
Unrealized holding gains arising during the year | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 583 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 664 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
(Gains) realized during the year | 0 us-gaap_GainLossOnSaleOfSecuritiesNet / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | (2,122)us-gaap_GainLossOnSaleOfSecuritiesNet / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 0 us-gaap_GainLossOnSaleOfSecuritiesNet / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Other comprehensive (loss) income – foreign currency: |  |  |
Currency translation adjustments arising during the year | (552)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 613 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Other comprehensive (loss) income | (16,990)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 37,986 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 3,570 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Comprehensive income | 641,693 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 1,943,339 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 884,774 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest | 2,544 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | (538)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | 844 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember
Comprehensive income attributable to controlling interests | $ 639,149 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 1,943,877 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember | $ 883,930 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_PartnershipInterestMember

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