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ACQUISITIONS, DEVELOPMENTS PLACED IN SERVICE AND DISPOSITIONS, PROPERTY ACQUISITIONS (Details) (USD $) | 9 Months Ended
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Jan. 31, 2015 | Jan. 31, 2014
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Transaction costs expensed | $ 104,000 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed |  | $ 160,000 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed |
Goodwill, Acquired During Period | 852,000 us-gaap_GoodwillAcquiredDuringPeriod |  |  |
Results of operations from acquired properties [Abstract] |  |  |  |
Total revenue | 1,756,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual |  | 1,149,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual |
Net loss | (27,000)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual |  | (194,000)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual |
Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Land | 8,949,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |
Building | 101,434,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |
Acquisitions [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Total acquisition cost | 41,297,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember |  | 35,114,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember |
Cash | 24,306,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember |  | 29,734,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember |
Units | 100,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember | [1] | 3,480,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember | [1]
Other | 16,891,000 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember | [2] | 1,900,000 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember | [3]
Land | 16,271,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember |  | 6,068,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember |
Building | 24,661,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember |  | 28,146,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember |
Intangible assets | 365,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember |  | 900,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember |
Acquisitions [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Total acquisition cost | 26,780,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  | 19,600,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Cash | 14,511,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  | 16,120,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Units | 100,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1] | 3,480,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1]
Other | 12,169,000 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [2] | 0 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [3]
Land | 1,754,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  | 1,447,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Building | 24,661,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  | 17,635,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Intangible assets | 365,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  | 518,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Acquisitions [Member] | Commercial Healthcare [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Total acquisition cost |  |  | 11,863,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialHealthcareMember |
Cash |  |  | 11,863,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialHealthcareMember |
Units |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialHealthcareMember | [1]
Other |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialHealthcareMember | [3]
Land |  |  | 970,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialHealthcareMember |
Building |  |  | 10,511,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialHealthcareMember |
Intangible assets |  |  | 382,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialHealthcareMember |
Acquisitions [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Total acquisition cost | 14,517,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  | 3,651,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Cash | 9,795,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  | 1,751,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Units | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [1] | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [1]
Other | 4,722,000 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [2] | 1,900,000 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [3]
Land | 14,517,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  | 3,651,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Building | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Intangible assets | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Acquisitions [Member] | 71 France Phase I - Edina, MN [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Jun. 12, 2014 | [4] |  |
Total acquisition cost | 1,413,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_FrancePhaseIEdinaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [4] |  |
Cash | 0 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_FrancePhaseIEdinaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [4] |  |
Units | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_FrancePhaseIEdinaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [1],[4] |  |
Other | 1,413,000 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_FrancePhaseIEdinaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [2],[4] |  |
Land | 1,413,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_FrancePhaseIEdinaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [4] |  |
Building | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_FrancePhaseIEdinaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [4] |  |
Intangible assets | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_FrancePhaseIEdinaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [4] |  |
Interest held (in hundredths) | 52.60%us-gaap_EquityMethodInvestmentOwnershipPercentage / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_FrancePhaseIEdinaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [4] |  |
JV Partner Contributions | 4,700,000 iret_JvPartnerContributions / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_FrancePhaseIEdinaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [4] |  |
Acquisitions [Member] | 71 France Phase 2 & 3 - Edina, MN [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Nov. 04, 2014 | [4] |  |
Total acquisition cost | 3,309,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Seven1FrancePhase23EdinaMNMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [4] |  |
Cash | 0 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Seven1FrancePhase23EdinaMNMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [4] |  |
Units | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Seven1FrancePhase23EdinaMNMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [1],[4] |  |
Other | 3,309,000 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Seven1FrancePhase23EdinaMNMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [2],[4] |  |
Land | 3,309,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Seven1FrancePhase23EdinaMNMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [4] |  |
Building | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Seven1FrancePhase23EdinaMNMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [4] |  |
Intangible assets | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Seven1FrancePhase23EdinaMNMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [4] |  |
Acquisitions [Member] | Alps Park - Rapid City, SD [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | May 01, 2013 |  |  |
Total acquisition cost |  |  | 6,200,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_AlpsParkRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Cash |  |  | 2,920,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_AlpsParkRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Units |  |  | 3,280,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_AlpsParkRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1]
Other |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_AlpsParkRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [3]
Land |  |  | 287,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_AlpsParkRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Building |  |  | 5,551,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_AlpsParkRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Intangible assets |  |  | 362,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_AlpsParkRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Number of units |  |  | 71 iret_NumberOfApartmentUnitsAcquisitions / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_AlpsParkRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Acquisitions [Member] | Chateau II - Minot, ND [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | May 21, 2013 |  |  |
Total acquisition cost |  |  | 179,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_ChateauIiMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Cash |  |  | 179,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_ChateauIiMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Units |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_ChateauIiMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [1]
Other |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_ChateauIiMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [3]
Land |  |  | 179,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_ChateauIiMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Building |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_ChateauIiMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Intangible assets |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_ChateauIiMinotNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Acquisitions [Member] | Creekside Crossing - Bismarck, ND [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | May 22, 2014 |  |  |
Total acquisition cost | 4,269,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_CreeksideCrossingBismarckNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Cash | 4,269,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_CreeksideCrossingBismarckNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Units | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_CreeksideCrossingBismarckNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [1] |  |
Other | 0 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_CreeksideCrossingBismarckNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [2] |  |
Land | 4,269,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_CreeksideCrossingBismarckNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Building | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_CreeksideCrossingBismarckNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Intangible assets | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_CreeksideCrossingBismarckNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Acquisitions [Member] | Homestead Garden - Rapid City, SD [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Jun. 02, 2014 | [5] |  |
Total acquisition cost | 15,000,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_HomesteadGardenRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [5] |  |
Cash | 5,092,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_HomesteadGardenRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [5] |  |
Units | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_HomesteadGardenRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1],[5] |  |
Other | 9,908,000 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_HomesteadGardenRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [2],[5] |  |
Land | 655,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_HomesteadGardenRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [5] |  |
Building | 14,139,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_HomesteadGardenRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [5] |  |
Intangible assets | 206,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_HomesteadGardenRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [5] |  |
Number of units | 152 iret_NumberOfApartmentUnitsAcquisitions / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_HomesteadGardenRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [5] |  |
Goodwill, Acquired During Period | 852,000 us-gaap_GoodwillAcquiredDuringPeriod / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_HomesteadGardenRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [5] |  |
Noncash or Part Noncash Acquisition, Debt Assumed | 9,900,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_HomesteadGardenRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [5] |  |
Acquisitions [Member] | Minot 1525 24th Ave SW - Minot, ND [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Dec. 23, 2014 |  |  |
Total acquisition cost | 1,250,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Minot152524thAveSWMinotNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Cash | 1,250,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Minot152524thAveSWMinotNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Units | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Minot152524thAveSWMinotNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [1] |  |
Other | 0 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Minot152524thAveSWMinotNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [2] |  |
Land | 1,250,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Minot152524thAveSWMinotNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Building | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Minot152524thAveSWMinotNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Intangible assets | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Minot152524thAveSWMinotNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Acquisitions [Member] | PrairieCare Medical - Brooklyn Park, MN [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Jun. 05, 2014 |  |  |
Total acquisition cost | 2,616,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_PrairiecareMedicalBrooklynParkMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Cash | 2,616,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_PrairiecareMedicalBrooklynParkMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Units | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_PrairiecareMedicalBrooklynParkMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [1] |  |
Other | 0 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_PrairiecareMedicalBrooklynParkMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [2] |  |
Land | 2,616,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_PrairiecareMedicalBrooklynParkMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Building | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_PrairiecareMedicalBrooklynParkMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Intangible assets | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_PrairiecareMedicalBrooklynParkMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Acquisitions [Member] | Jamestown Unimproved - Jamestown, ND [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Aug. 09, 2013 |  |  |
Total acquisition cost |  |  | 700,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_JamestownUnimprovedJamestownNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Cash |  |  | 700,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_JamestownUnimprovedJamestownNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Units |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_JamestownUnimprovedJamestownNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [1]
Other |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_JamestownUnimprovedJamestownNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [3]
Land |  |  | 700,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_JamestownUnimprovedJamestownNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Building |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_JamestownUnimprovedJamestownNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Intangible assets |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_JamestownUnimprovedJamestownNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Acquisitions [Member] | Legends at Heritage Place - Sartell, MN [Member] | Commercial Healthcare [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Oct. 31, 2013 |  |  |
Total acquisition cost |  |  | 11,863,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_LegendsAtHeritagePlaceSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialHealthcareMember |
Cash |  |  | 11,863,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_LegendsAtHeritagePlaceSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialHealthcareMember |
Units |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_LegendsAtHeritagePlaceSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialHealthcareMember | [1]
Other |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_LegendsAtHeritagePlaceSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialHealthcareMember | [3]
Land |  |  | 970,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_LegendsAtHeritagePlaceSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialHealthcareMember |
Building |  |  | 10,511,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_LegendsAtHeritagePlaceSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialHealthcareMember |
Intangible assets |  |  | 382,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_LegendsAtHeritagePlaceSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialHealthcareMember |
Area of property |  |  | 98,174 us-gaap_AreaOfRealEstateProperty / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_LegendsAtHeritagePlaceSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialHealthcareMember |
Acquisitions [Member] | Legends at Heritage Place - Sartell, MN [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Oct. 31, 2013 |  |  |
Total acquisition cost |  |  | 537,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_LegendsAtHeritagePlaceSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Cash |  |  | 537,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_LegendsAtHeritagePlaceSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Units |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_LegendsAtHeritagePlaceSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [1]
Other |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_LegendsAtHeritagePlaceSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [3]
Land |  |  | 537,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_LegendsAtHeritagePlaceSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Building |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_LegendsAtHeritagePlaceSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Intangible assets |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_LegendsAtHeritagePlaceSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Acquisitions [Member] | Monticello 7th Addition - Monticello, MN [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Oct. 09, 2014 |  |  |
Total acquisition cost | 1,660,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Monticello7thAdditionMonticelloMNMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Cash | 1,660,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Monticello7thAdditionMonticelloMNMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Units | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Monticello7thAdditionMonticelloMNMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [1] |  |
Other | 0 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Monticello7thAdditionMonticelloMNMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [2] |  |
Land | 1,660,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Monticello7thAdditionMonticelloMNMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Building | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Monticello7thAdditionMonticelloMNMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Intangible assets | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Monticello7thAdditionMonticelloMNMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |  |  |
Acquisitions [Member] | Northridge - Bismarck, ND [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Sep. 12, 2014 |  |  |
Total acquisition cost | 8,500,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_NorthridgeBismarckNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |
Cash | 8,400,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_NorthridgeBismarckNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |
Units | 100,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_NorthridgeBismarckNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1] |  |
Other | 0 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_NorthridgeBismarckNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [2] |  |
Land | 884,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_NorthridgeBismarckNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |
Building | 7,516,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_NorthridgeBismarckNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |
Intangible assets | 100,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_NorthridgeBismarckNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |
Number of units | 68 iret_NumberOfApartmentUnitsAcquisitions / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_NorthridgeBismarckNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |
Acquisitions [Member] | Pinecone Villas - Sartell, MN [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Oct. 31, 2013 |  |  |
Total acquisition cost |  |  | 2,800,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_PineconeVillasSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Cash |  |  | 2,800,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_PineconeVillasSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Units |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_PineconeVillasSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1]
Other |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_PineconeVillasSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [3]
Land |  |  | 584,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_PineconeVillasSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Building |  |  | 2,191,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_PineconeVillasSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Intangible assets |  |  | 25,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_PineconeVillasSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Number of units |  |  | 24 iret_NumberOfApartmentUnitsAcquisitions / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_PineconeVillasSartellMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Acquisitions [Member] | RED 20 - Minneapolis, MN [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Aug. 20, 2013 | [6] |  |
Total acquisition cost |  |  | 1,900,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Red20MinneapolisMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [6]
Cash |  |  | 0 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Red20MinneapolisMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [6]
Units |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Red20MinneapolisMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [1],[6]
Other |  |  | 1,900,000 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Red20MinneapolisMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [3],[6]
Land |  |  | 1,900,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Red20MinneapolisMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [6]
Building |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Red20MinneapolisMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [6]
Intangible assets |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Red20MinneapolisMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [6]
Interest held (in hundredths) |  |  | 58.60%us-gaap_EquityMethodInvestmentOwnershipPercentage / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_Red20MinneapolisMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember | [6]
Acquisitions [Member] | Silver Springs - Rapid City, SD [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Jun. 02, 2014 |  |  |
Total acquisition cost | 3,280,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SilverSpringsRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |
Cash | 1,019,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SilverSpringsRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |
Units | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SilverSpringsRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1] |  |
Other | 2,261,000 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SilverSpringsRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [2] |  |
Land | 215,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SilverSpringsRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |
Building | 3,006,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SilverSpringsRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |
Intangible assets | 59,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SilverSpringsRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |
Number of units | 52 iret_NumberOfApartmentUnitsAcquisitions / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SilverSpringsRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |
Noncash or Part Noncash Acquisition, Debt Assumed | 2,300,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SilverSpringsRapidCitySdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |  |  |
Acquisitions [Member] | Southpoint - Grand Forks, ND [Member] | Multi-Family Residential [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Sep. 05, 2013 |  |  |
Total acquisition cost |  |  | 10,600,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SouthpointGrandForksNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Cash |  |  | 10,400,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SouthpointGrandForksNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Units |  |  | 200,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SouthpointGrandForksNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [1]
Other |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SouthpointGrandForksNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | [3]
Land |  |  | 576,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SouthpointGrandForksNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Building |  |  | 9,893,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SouthpointGrandForksNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Intangible assets |  |  | 131,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SouthpointGrandForksNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Number of units |  |  | 96 iret_NumberOfApartmentUnitsAcquisitions / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SouthpointGrandForksNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Acquisitions [Member] | Spring Creek Fruitland - Fruitland, ID [Member] | Unimproved Land [Member] |  |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |  |
Date Acquisition | Jan. 21, 2014 |  |  |
Total acquisition cost |  |  | 335,000 us-gaap_PropertyPlantAndEquipmentGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SpringCreekFruitlandFruitlandIdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Cash |  |  | 335,000 us-gaap_PaymentsToAcquireBusinessesGross / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SpringCreekFruitlandFruitlandIdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Units |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SpringCreekFruitlandFruitlandIdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Other |  |  | 0 us-gaap_BusinessCombinationConsiderationTransferredOther1 / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SpringCreekFruitlandFruitlandIdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Land |  |  | 335,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SpringCreekFruitlandFruitlandIdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Building |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SpringCreekFruitlandFruitlandIdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Intangible assets |  |  | $ 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis = iret_AcquisitionsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = iret_SpringCreekFruitlandFruitlandIdMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
[1] | Value of limited partnership units of the Operating Partnership at the acquisition date.
[2] | Consists of assumed debt (Homestead Garden I - $9.9 million, Silver Springs - $2.3 million) and value of land contributed by the joint venture partner (71 France - $4.7 million).
[3] | Value of land contributed by the joint venture partner.
[4] | Land was contributed to a joint venture in which the Company has an approximately 52.6% interest. The joint venture is consolidated in IRETs financial statements.
[5] | At acquisition the Company adjusted the assumed debt to fair value and recognized approximately $852,000 of goodwill.
[6] | Land is owned by a joint venture in which the Company has an approximately 58.6% interest. The joint venture is consolidated in IRETs financial statements

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