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ACQUISITIONS, DEVELOPMENTS PLACED IN SERVICE AND DISPOSITIONS, PROPERTY ACQUISITIONS (Details) (USD $)
9 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Acquisitions and development projects placed in service [Abstract]    
Transaction costs expensed $ 104,000us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed $ 160,000us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed
Goodwill, Acquired During Period 852,000us-gaap_GoodwillAcquiredDuringPeriod  
Results of operations from acquired properties [Abstract]    
Total revenue 1,756,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual 1,149,000us-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 8,949,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
 
Building 101,434,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
 
Acquisitions [Member]    
Acquisitions and development projects placed in service [Abstract]    
Total acquisition cost 41,297,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
35,114,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
Cash 24,306,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
29,734,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
Units 100,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
[1] 3,480,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
[1]
Other 16,891,000us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
[2] 1,900,000us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
[3]
Land 16,271,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
6,068,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
Building 24,661,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
28,146,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
Intangible assets 365,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
Acquisitions [Member] | Multi-Family Residential [Member]    
Acquisitions and development projects placed in service [Abstract]    
Total acquisition cost 26,780,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
19,600,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Cash 14,511,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
16,120,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Units 100,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[1] 3,480,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[1]
Other 12,169,000us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[2] 0us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[3]
Land 1,754,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
1,447,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Building 24,661,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
17,635,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Intangible assets 365,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
518,000us-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   11,863,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_CommercialHealthcareMember
Cash   11,863,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_CommercialHealthcareMember
Units   0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_CommercialHealthcareMember
[1]
Other   0us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_CommercialHealthcareMember
[3]
Land   970,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_CommercialHealthcareMember
Building   10,511,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_CommercialHealthcareMember
Intangible assets   382,000us-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 14,517,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
3,651,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Cash 9,795,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
1,751,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Units 0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[1] 0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[1]
Other 4,722,000us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[2] 1,900,000us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[3]
Land 14,517,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
3,651,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Building 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Intangible assets 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
0us-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 1,413,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_FrancePhaseIEdinaMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[4]  
Cash 0us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_FrancePhaseIEdinaMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[4]  
Units 0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_FrancePhaseIEdinaMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[1],[4]  
Other 1,413,000us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_FrancePhaseIEdinaMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[2],[4]  
Land 1,413,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_FrancePhaseIEdinaMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[4]  
Building 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_FrancePhaseIEdinaMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[4]  
Intangible assets 0us-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 4,700,000iret_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 3,309,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Seven1FrancePhase23EdinaMNMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[4]  
Cash 0us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Seven1FrancePhase23EdinaMNMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[4]  
Units 0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Seven1FrancePhase23EdinaMNMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[1],[4]  
Other 3,309,000us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Seven1FrancePhase23EdinaMNMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[2],[4]  
Land 3,309,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Seven1FrancePhase23EdinaMNMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[4]  
Building 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Seven1FrancePhase23EdinaMNMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[4]  
Intangible assets 0us-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   6,200,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_AlpsParkRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Cash   2,920,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_AlpsParkRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Units   3,280,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_AlpsParkRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[1]
Other   0us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_AlpsParkRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[3]
Land   287,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_AlpsParkRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Building   5,551,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_AlpsParkRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Intangible assets   362,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_AlpsParkRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Number of units   71iret_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   179,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_ChateauIiMinotNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Cash   179,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_ChateauIiMinotNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Units   0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_ChateauIiMinotNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[1]
Other   0us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_ChateauIiMinotNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[3]
Land   179,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_ChateauIiMinotNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Building   0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_ChateauIiMinotNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Intangible assets   0us-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 4,269,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_CreeksideCrossingBismarckNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
 
Cash 4,269,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_CreeksideCrossingBismarckNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
 
Units 0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_CreeksideCrossingBismarckNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[1]  
Other 0us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_CreeksideCrossingBismarckNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[2]  
Land 4,269,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_CreeksideCrossingBismarckNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
 
Building 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_CreeksideCrossingBismarckNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
 
Intangible assets 0us-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 15,000,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_HomesteadGardenRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[5]  
Cash 5,092,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_HomesteadGardenRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[5]  
Units 0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_HomesteadGardenRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[1],[5]  
Other 9,908,000us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_HomesteadGardenRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[2],[5]  
Land 655,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_HomesteadGardenRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[5]  
Building 14,139,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_HomesteadGardenRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[5]  
Intangible assets 206,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_HomesteadGardenRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[5]  
Number of units 152iret_NumberOfApartmentUnitsAcquisitions
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_HomesteadGardenRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[5]  
Goodwill, Acquired During Period 852,000us-gaap_GoodwillAcquiredDuringPeriod
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_HomesteadGardenRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[5]  
Noncash or Part Noncash Acquisition, Debt Assumed 9,900,000us-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 1,250,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Minot152524thAveSWMinotNDMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
 
Cash 1,250,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Minot152524thAveSWMinotNDMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
 
Units 0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Minot152524thAveSWMinotNDMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[1]  
Other 0us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Minot152524thAveSWMinotNDMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[2]  
Land 1,250,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Minot152524thAveSWMinotNDMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
 
Building 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Minot152524thAveSWMinotNDMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
 
Intangible assets 0us-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 2,616,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_PrairiecareMedicalBrooklynParkMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
 
Cash 2,616,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_PrairiecareMedicalBrooklynParkMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
 
Units 0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_PrairiecareMedicalBrooklynParkMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[1]  
Other 0us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_PrairiecareMedicalBrooklynParkMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[2]  
Land 2,616,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_PrairiecareMedicalBrooklynParkMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
 
Building 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_PrairiecareMedicalBrooklynParkMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
 
Intangible assets 0us-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   700,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_JamestownUnimprovedJamestownNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Cash   700,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_JamestownUnimprovedJamestownNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Units   0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_JamestownUnimprovedJamestownNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[1]
Other   0us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_JamestownUnimprovedJamestownNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[3]
Land   700,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_JamestownUnimprovedJamestownNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Building   0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_JamestownUnimprovedJamestownNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Intangible assets   0us-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   11,863,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_LegendsAtHeritagePlaceSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_CommercialHealthcareMember
Cash   11,863,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_LegendsAtHeritagePlaceSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_CommercialHealthcareMember
Units   0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_LegendsAtHeritagePlaceSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_CommercialHealthcareMember
[1]
Other   0us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_LegendsAtHeritagePlaceSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_CommercialHealthcareMember
[3]
Land   970,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_LegendsAtHeritagePlaceSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_CommercialHealthcareMember
Building   10,511,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_LegendsAtHeritagePlaceSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_CommercialHealthcareMember
Intangible assets   382,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_LegendsAtHeritagePlaceSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_CommercialHealthcareMember
Area of property   98,174us-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   537,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_LegendsAtHeritagePlaceSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Cash   537,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_LegendsAtHeritagePlaceSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Units   0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_LegendsAtHeritagePlaceSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[1]
Other   0us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_LegendsAtHeritagePlaceSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[3]
Land   537,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_LegendsAtHeritagePlaceSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Building   0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_LegendsAtHeritagePlaceSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Intangible assets   0us-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 1,660,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Monticello7thAdditionMonticelloMNMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
 
Cash 1,660,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Monticello7thAdditionMonticelloMNMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
 
Units 0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Monticello7thAdditionMonticelloMNMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[1]  
Other 0us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Monticello7thAdditionMonticelloMNMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[2]  
Land 1,660,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Monticello7thAdditionMonticelloMNMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
 
Building 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Monticello7thAdditionMonticelloMNMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
 
Intangible assets 0us-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 8,500,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_NorthridgeBismarckNDMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
 
Cash 8,400,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_NorthridgeBismarckNDMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
 
Units 100,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_NorthridgeBismarckNDMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[1]  
Other 0us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_NorthridgeBismarckNDMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[2]  
Land 884,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_NorthridgeBismarckNDMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
 
Building 7,516,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_NorthridgeBismarckNDMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
 
Intangible assets 100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_NorthridgeBismarckNDMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
 
Number of units 68iret_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   2,800,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_PineconeVillasSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Cash   2,800,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_PineconeVillasSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Units   0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_PineconeVillasSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[1]
Other   0us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_PineconeVillasSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[3]
Land   584,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_PineconeVillasSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Building   2,191,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_PineconeVillasSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Intangible assets   25,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_PineconeVillasSartellMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Number of units   24iret_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   1,900,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Red20MinneapolisMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[6]
Cash   0us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Red20MinneapolisMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[6]
Units   0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Red20MinneapolisMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[1],[6]
Other   1,900,000us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Red20MinneapolisMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[3],[6]
Land   1,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Red20MinneapolisMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[6]
Building   0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_Red20MinneapolisMnMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
[6]
Intangible assets   0us-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 3,280,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SilverSpringsRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
 
Cash 1,019,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SilverSpringsRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
 
Units 0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SilverSpringsRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[1]  
Other 2,261,000us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SilverSpringsRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[2]  
Land 215,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SilverSpringsRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
 
Building 3,006,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SilverSpringsRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
 
Intangible assets 59,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SilverSpringsRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
 
Number of units 52iret_NumberOfApartmentUnitsAcquisitions
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SilverSpringsRapidCitySdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
 
Noncash or Part Noncash Acquisition, Debt Assumed 2,300,000us-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   10,600,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SouthpointGrandForksNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Cash   10,400,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SouthpointGrandForksNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Units   200,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SouthpointGrandForksNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[1]
Other   0us-gaap_BusinessCombinationConsiderationTransferredOther1
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SouthpointGrandForksNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
[3]
Land   576,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SouthpointGrandForksNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Building   9,893,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SouthpointGrandForksNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Intangible assets   131,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SouthpointGrandForksNdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_MultiFamilyResidentialMember
Number of units   96iret_NumberOfApartmentUnitsAcquisitions
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= 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   335,000us-gaap_PropertyPlantAndEquipmentGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SpringCreekFruitlandFruitlandIdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Cash   335,000us-gaap_PaymentsToAcquireBusinessesGross
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SpringCreekFruitlandFruitlandIdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Units   0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
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= iret_SpringCreekFruitlandFruitlandIdMember
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= iret_UnimprovedLandMember
Other   0us-gaap_BusinessCombinationConsiderationTransferredOther1
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= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SpringCreekFruitlandFruitlandIdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Land   335,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SpringCreekFruitlandFruitlandIdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Building   0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
/ iret_BusinessAcquisitionByStatusOfPropertyAcquiredAxis
= iret_AcquisitionsMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= iret_SpringCreekFruitlandFruitlandIdMember
/ us-gaap_StatementBusinessSegmentsAxis
= iret_UnimprovedLandMember
Intangible assets   $ 0us-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