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ACQUISITIONS, DEVELOPMENTS PLACED IN SERVICE AND DISPOSITIONS, PROPERTY DISPOSITIONS (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Jan. 31, 2015 | Jan. 31, 2014
Dispositions [Abstract] |  |
Sales price | $ 27,619 us-gaap_Revenues | $ 80,883 us-gaap_Revenues
Book value and sales cost | 28,412 us-gaap_CostOfRealEstateSales | 73,884 us-gaap_CostOfRealEstateSales
Gain/(loss) | (793)us-gaap_GainLossOnDispositionOfAssets | 6,999 us-gaap_GainLossOnDispositionOfAssets
Multi-Family Residential [Member] |  |
Dispositions [Abstract] |  |
Sales price | 4,451 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | 3,510 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember
Book value and sales cost | 3,033 us-gaap_CostOfRealEstateSales / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | 3,738 us-gaap_CostOfRealEstateSales / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember
Gain/(loss) | 1,418 us-gaap_GainLossOnDispositionOfAssets / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember | (228)us-gaap_GainLossOnDispositionOfAssets / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember
Number of properties sold |  | 2 iret_NumberOfPropertiesSold / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember
Multi-Family Residential [Member] | East Park Sioux Falls SD [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Dec. 18, 2013 |
Sales price |  | 2,214 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_EastParkSiouxFallsSdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember
Book value and sales cost |  | 2,358 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_EastParkSiouxFallsSdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember
Gain/(loss) |  | (144)us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_EastParkSiouxFallsSdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember
Number of apartment units dispositions (in units) |  | 84 iret_IretNumberOfApartmentUnitsDispositions / iret_SignificantDisposalsByTransactionAxis = iret_EastParkSiouxFallsSdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember
Multi-Family Residential [Member] | Lancaster St Cloud MN [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Sep. 22, 2014 |
Sales price | 4,451 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_LancasterStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Book value and sales cost | 3,033 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_LancasterStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Gain/(loss) | 1,418 us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_LancasterStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Number of apartment units dispositions (in units) | 83 iret_IretNumberOfApartmentUnitsDispositions / iret_SignificantDisposalsByTransactionAxis = iret_LancasterStCloudMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember |
Multi-Family Residential [Member] | Sycamore Village - Sioux Falls, SD [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Dec. 18, 2013 |
Sales price |  | 1,296 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_SycamoreVillageSiouxFallsSdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember
Book value and sales cost |  | 1,380 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_SycamoreVillageSiouxFallsSdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember
Gain/(loss) |  | (84)us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_SycamoreVillageSiouxFallsSdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember
Number of apartment units dispositions (in units) |  | 48 iret_IretNumberOfApartmentUnitsDispositions / iret_SignificantDisposalsByTransactionAxis = iret_SycamoreVillageSiouxFallsSdMember / us-gaap_StatementBusinessSegmentsAxis = iret_MultiFamilyResidentialMember
Commercial Office [Member] |  |
Dispositions [Abstract] |  |
Sales price | 14,825 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember | 12,950 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember
Book value and sales cost | 14,700 us-gaap_CostOfRealEstateSales / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember | 14,504 us-gaap_CostOfRealEstateSales / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember
Gain/(loss) | 125 us-gaap_GainLossOnDispositionOfAssets / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember | (1,554)us-gaap_GainLossOnDispositionOfAssets / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember
Number of properties sold |  | 3 iret_NumberOfPropertiesSold / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember
Commercial Office [Member] | Northgate I Maple Grove MN [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Dec. 01, 2014 |
Sales price | 7,200 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_NorthgateIMapleGroveMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember |
Book value and sales cost | 6,881 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_NorthgateIMapleGroveMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember |
Gain/(loss) | 319 us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_NorthgateIMapleGroveMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember |
Area of a real estate property (in square feet) | 79,297 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_NorthgateIMapleGroveMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember |
Commercial Office [Member] | Bloomington Business Plaza, Bloomington, Minnesota [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Sep. 12, 2013 |
Sales price |  | 4,500 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_BloomingtonBusinessPlazaBloomingtonMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember
Book value and sales cost |  | 7,339 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_BloomingtonBusinessPlazaBloomingtonMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember
Gain/(loss) |  | (2,839)us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_BloomingtonBusinessPlazaBloomingtonMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember
Area of a real estate property (in square feet) |  | 121,669 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_BloomingtonBusinessPlazaBloomingtonMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember
Commercial Office [Member] | Nicollet VII, Burnsville, Minnesota [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Sep. 12, 2013 |
Sales price |  | 7,290 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_NicolletViiBurnsvilleMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember
Book value and sales cost |  | 6,001 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_NicolletViiBurnsvilleMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember
Gain/(loss) |  | 1,289 us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_NicolletViiBurnsvilleMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember
Area of a real estate property (in square feet) |  | 118,125 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_NicolletViiBurnsvilleMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember
Commercial Office [Member] | Pillsbury Business Center, Bloomington, Minnesota [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Sep. 12, 2013 |
Sales price |  | 1,160 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_PillsburyBusinessCenterBloomingtonMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember
Book value and sales cost |  | 1,164 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_PillsburyBusinessCenterBloomingtonMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember
Gain/(loss) |  | (4)us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_PillsburyBusinessCenterBloomingtonMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember
Area of a real estate property (in square feet) |  | 42,929 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_PillsburyBusinessCenterBloomingtonMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember
Commercial Office [Member] | Dewey Hill - Edina, MN [Member] |  |
Dispositions [Abstract] |  |
Date disposed | May 19, 2014 |
Sales price | 3,100 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_DeweyHillEdinaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember |
Book value and sales cost | 3,124 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_DeweyHillEdinaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember |
Gain/(loss) | (24)us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_DeweyHillEdinaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember |
Area of a real estate property (in square feet) | 73,338 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_DeweyHillEdinaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember |
Commercial Office [Member] | Wirth Corporate Center Golden Valley MN [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Aug. 29, 2014 |
Sales price | 4,525 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_WirthCorporateCenterGoldenValleyMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember |
Book value and sales cost | 4,695 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_WirthCorporateCenterGoldenValleyMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember |
Gain/(loss) | (170)us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_WirthCorporateCenterGoldenValleyMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember |
Area of a real estate property (in square feet) | 74,568 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_WirthCorporateCenterGoldenValleyMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialOfficeMember |
Commercial Industrial [Member] |  |
Dispositions [Abstract] |  |
Sales price | 3,600 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember | 61,138 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Book value and sales cost | 5,393 us-gaap_CostOfRealEstateSales / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember | 52,079 us-gaap_CostOfRealEstateSales / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Gain/(loss) | (1,793)us-gaap_GainLossOnDispositionOfAssets / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember | 9,059 us-gaap_GainLossOnDispositionOfAssets / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Number of properties sold |  | 12 iret_NumberOfPropertiesSold / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Commercial Industrial [Member] | Eagan 2785 & 2795 - Eagan, MN [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Jul. 15, 2014 |
Sales price | 3,600 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_Eagan27852795EaganMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember |
Book value and sales cost | 5,393 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_Eagan27852795EaganMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember |
Gain/(loss) | (1,793)us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_Eagan27852795EaganMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember |
Area of a real estate property (in square feet) | 198,600 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_Eagan27852795EaganMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember |
Commercial Industrial [Member] | Bodycote Industrial Building Eden Prairie MN [Member] |  |
Dispositions [Abstract] |  |
Date disposed | May 13, 2013 |
Sales price |  | 3,150 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_BodycoteIndustrialBuildingEdenPrairieMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Book value and sales cost |  | 1,375 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_BodycoteIndustrialBuildingEdenPrairieMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Gain/(loss) |  | 1,775 us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_BodycoteIndustrialBuildingEdenPrairieMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Area of a real estate property (in square feet) |  | 41,880 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_BodycoteIndustrialBuildingEdenPrairieMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Commercial Industrial [Member] | Fargo 1320 45th St N Fargo ND [Member] |  |
Dispositions [Abstract] |  |
Date disposed | May 13, 2013 |
Sales price |  | 4,700 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_Fargo132045ThStNFargoNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Book value and sales cost |  | 4,100 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_Fargo132045ThStNFargoNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Gain/(loss) |  | 600 us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_Fargo132045ThStNFargoNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Area of a real estate property (in square feet) |  | 42,244 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_Fargo132045ThStNFargoNdMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Commercial Industrial [Member] | Metal Improvement Company New Brighton MN [Member] |  |
Dispositions [Abstract] |  |
Date disposed | May 13, 2013 |
Sales price |  | 2,350 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_MetalImprovementCompanyNewBrightonMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Book value and sales cost |  | 1,949 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_MetalImprovementCompanyNewBrightonMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Gain/(loss) |  | 401 us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_MetalImprovementCompanyNewBrightonMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Area of a real estate property (in square feet) |  | 49,620 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_MetalImprovementCompanyNewBrightonMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Commercial Industrial [Member] | Roseville 2929 Long Lake Road - Roseville, MN [Member] |  |
Dispositions [Abstract] |  |
Date disposed | May 13, 2013 |
Sales price |  | 9,275 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_Roseville2929LongLakeRoadRosevilleMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Book value and sales cost |  | 9,998 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_Roseville2929LongLakeRoadRosevilleMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Gain/(loss) |  | (723)us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_Roseville2929LongLakeRoadRosevilleMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Area of a real estate property (in square feet) |  | 172,057 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_Roseville2929LongLakeRoadRosevilleMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Commercial Industrial [Member] | Brooklyn Park 7401 Boone Avenue, Brooklyn Park, Minnesota [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Sep. 12, 2013 |
Sales price |  | 12,800 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_BrooklynPark7401BooneAvenueBrooklynParkMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Book value and sales cost |  | 12,181 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_BrooklynPark7401BooneAvenueBrooklynParkMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Gain/(loss) |  | 619 us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_BrooklynPark7401BooneAvenueBrooklynParkMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Area of a real estate property (in square feet) |  | 322,751 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_BrooklynPark7401BooneAvenueBrooklynParkMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Commercial Industrial [Member] | Cedar Lake Business Center, St. Louis Park, Minnesota [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Sep. 12, 2013 |
Sales price |  | 2,550 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_CedarLakeBusinessCenterStLouisParkMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Book value and sales cost |  | 2,607 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_CedarLakeBusinessCenterStLouisParkMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Gain/(loss) |  | (57)us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_CedarLakeBusinessCenterStLouisParkMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Area of a real estate property (in square feet) |  | 50,400 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_CedarLakeBusinessCenterStLouisParkMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Commercial Industrial [Member] | API Building, Duluth, Minnesota [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Sep. 24, 2013 |
Sales price |  | 2,553 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_ApiBuildingDuluthMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Book value and sales cost |  | 1,488 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_ApiBuildingDuluthMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Gain/(loss) |  | 1,065 us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_ApiBuildingDuluthMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Area of a real estate property (in square feet) |  | 35,000 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_ApiBuildingDuluthMinnesotaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Commercial Industrial [Member] | Lighthouse Duluth MN [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Oct. 08, 2013 |
Sales price |  | 1,825 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_LighthouseDuluthMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Book value and sales cost |  | 1,547 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_LighthouseDuluthMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Gain/(loss) |  | 278 us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_LighthouseDuluthMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Area of a real estate property (in square feet) |  | 59,292 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_LighthouseDuluthMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Commercial Industrial [Member] | Dixon Avenue Industrial Park, Des Moines, Iowa [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Oct. 31, 2013 |
Sales price |  | 14,675 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_DixonAvenueIndustrialParkDesMoinesIowaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Book value and sales cost |  | 10,328 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_DixonAvenueIndustrialParkDesMoinesIowaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Gain/(loss) |  | 4,347 us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_DixonAvenueIndustrialParkDesMoinesIowaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Area of a real estate property (in square feet) |  | 606,006 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_DixonAvenueIndustrialParkDesMoinesIowaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Commercial Industrial [Member] | Winsted Industrial Building Winsted MN [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Jan. 17, 2014 |
Sales price |  | 725 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_WinstedIndustrialBuildingWinstedMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Book value and sales cost |  | 747 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_WinstedIndustrialBuildingWinstedMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Gain/(loss) |  | (22)us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_WinstedIndustrialBuildingWinstedMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Area of a real estate property (in square feet) |  | 41,685 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_WinstedIndustrialBuildingWinstedMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Commercial Industrial [Member] | Minnetonka 13600 County Road 62 Minnetonka MN [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Jan. 30, 2014 |
Sales price |  | 3,800 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_Minnetonka13600CountyRoad62MinnetonkaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Book value and sales cost |  | 3,084 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_Minnetonka13600CountyRoad62MinnetonkaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Gain/(loss) |  | 716 us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_Minnetonka13600CountyRoad62MinnetonkaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Area of a real estate property (in square feet) |  | 69,984 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_Minnetonka13600CountyRoad62MinnetonkaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Commercial Industrial [Member] | Clive 2075 NW 94th Street, Clive, Iowa [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Jan. 30, 2014 |
Sales price |  | 2,735 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_Clive2075Nw94ThStreetCliveIowaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Book value and sales cost |  | 2,675 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_Clive2075Nw94ThStreetCliveIowaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Gain/(loss) |  | 60 us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_Clive2075Nw94ThStreetCliveIowaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Area of a real estate property (in square feet) |  | 42,510 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_Clive2075Nw94ThStreetCliveIowaMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialIndustrialMember
Commercial Retail [Member] |  |
Dispositions [Abstract] |  |
Sales price | 4,073 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember | 3,285 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember
Book value and sales cost | 4,616 us-gaap_CostOfRealEstateSales / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember | 3,563 us-gaap_CostOfRealEstateSales / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember
Gain/(loss) | (543)us-gaap_GainLossOnDispositionOfAssets / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember | (278)us-gaap_GainLossOnDispositionOfAssets / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember
Commercial Retail [Member] | Fargo Express Center & SC Pad - Fargo, ND [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Nov. 18, 2014 |
Sales price | 2,843 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_FargoExpressCenterSCPadFargoNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember |
Book value and sales cost | 2,211 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_FargoExpressCenterSCPadFargoNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember |
Gain/(loss) | 632 us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_FargoExpressCenterSCPadFargoNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember |
Area of a real estate property (in square feet) | 64,226 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_FargoExpressCenterSCPadFargoNDMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember |
Commercial Retail [Member] | Weston Retail Weston WI [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Jul. 28, 2014 |
Sales price | 0 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_WestonRetailWestonWiMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember |
Book value and sales cost | 1,176 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_WestonRetailWestonWiMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember |
Gain/(loss) | (1,176)us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_WestonRetailWestonWiMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember |
Area of a real estate property (in square feet) | 25,644 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_WestonRetailWestonWiMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember |
Commercial Retail [Member] | Kalispell Retail - Kalispell, MT [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Oct. 15, 2014 |
Sales price | 1,230 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_KalispellRetailKalispellMTMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember |
Book value and sales cost | 1,229 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_KalispellRetailKalispellMTMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember |
Gain/(loss) | 1 us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_KalispellRetailKalispellMTMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember |
Area of a real estate property (in square feet) | 52,000 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_KalispellRetailKalispellMTMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember |
Commercial Retail [Member] | Eagan Community Eagan MN [Member] |  |
Dispositions [Abstract] |  |
Date disposed | May 14, 2013 |
Sales price |  | 2,310 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_EaganCommunityEaganMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember
Book value and sales cost |  | 2,420 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_EaganCommunityEaganMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember
Gain/(loss) |  | (110)us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_EaganCommunityEaganMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember
Area of a real estate property (in square feet) |  | 23,187 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_EaganCommunityEaganMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember
Commercial Retail [Member] | Anoka Strip Center Anoka MN [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Dec. 23, 2013 |
Sales price |  | 325 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_AnokaStripCenterAnokaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember
Book value and sales cost |  | 347 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_AnokaStripCenterAnokaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember
Gain/(loss) |  | (22)us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_AnokaStripCenterAnokaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember
Area of a real estate property (in square feet) |  | 10,625 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_AnokaStripCenterAnokaMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember
Commercial Retail [Member] | Burnsville 2 Strip Center - Burnsville, MN [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Jan. 08, 2014 |
Sales price |  | 650 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_Urnsville2StripCenterBurnsvilleMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember
Book value and sales cost |  | 796 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_Urnsville2StripCenterBurnsvilleMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember
Gain/(loss) |  | (146)us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_Urnsville2StripCenterBurnsvilleMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember
Area of a real estate property (in square feet) |  | 8,400 iret_AreaOfRealEstatePropertyDispositions / iret_SignificantDisposalsByTransactionAxis = iret_Urnsville2StripCenterBurnsvilleMnMember / us-gaap_StatementBusinessSegmentsAxis = iret_CommercialRetailMember
Unimproved Land [Member] |  |
Dispositions [Abstract] |  |
Sales price | 670 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Book value and sales cost | 670 us-gaap_CostOfRealEstateSales / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Gain/(loss) | 0 us-gaap_GainLossOnDispositionOfAssets / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Unimproved Land [Member] | Kalispell Unimproved - Kalispell, MT [Member] |  |
Dispositions [Abstract] |  |
Date disposed | Oct. 15, 2014 |
Sales price | 670 us-gaap_Revenues / iret_SignificantDisposalsByTransactionAxis = iret_KalispellUnimprovedKalispellMTMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Book value and sales cost | 670 us-gaap_CostOfRealEstateSales / iret_SignificantDisposalsByTransactionAxis = iret_KalispellUnimprovedKalispellMTMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |
Gain/(loss) | $ 0 us-gaap_GainLossOnDispositionOfAssets / iret_SignificantDisposalsByTransactionAxis = iret_KalispellUnimprovedKalispellMTMember / us-gaap_StatementBusinessSegmentsAxis = iret_UnimprovedLandMember |

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