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Schedule III - Real Estate and Accumulated Depreciation (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Real Estate and Accumulated Depreciation [Line Items]    
Initial Cost, Land $ 112,600us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand  
Initial Cost, Building 571,128us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements  
Gross Carrying Amount, Land 112,600us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand [1]  
Gross Carrying Amount, Building 576,512us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements [1]  
Accumulated Depreciation- Building (23,376)irt_RealEstateAccumulatedDepreciationBuilding  
Encumbrances (Unpaid Principal) (398,977)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances  
Balance, beginning of period 190,096us-gaap_RealEstateGrossAtCarryingValue 153,565us-gaap_RealEstateGrossAtCarryingValue
Additions during period:    
Acquisitions 495,998us-gaap_RealEstateOtherAcquisitions 35,517us-gaap_RealEstateOtherAcquisitions
Improvements to land and building 4,159us-gaap_RealEstateImprovements 1,014us-gaap_RealEstateImprovements
Deductions during period:    
Dispositions of real estate (1,141)us-gaap_RealEstateCostOfRealEstateSold  
Balance, end of period 689,112us-gaap_RealEstateGrossAtCarryingValue 190,096us-gaap_RealEstateGrossAtCarryingValue
Balance, beginning of period 15,775us-gaap_RealEstateAccumulatedDepreciation 12,283us-gaap_RealEstateAccumulatedDepreciation
Depreciation expense 8,742us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense 3,492us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense
Dispositions of real estate (1,141)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold  
Balance, end of period 23,376us-gaap_RealEstateAccumulatedDepreciation 15,775us-gaap_RealEstateAccumulatedDepreciation
Crestmont Apartments    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Marietta, GA  
Initial Cost, Land 3,254us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember		  
Initial Cost, Building 13,044us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember		  
Gross Carrying Amount, Land 3,254us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember		 [1]  
Gross Carrying Amount, Building 13,353us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember		 [1]  
Accumulated Depreciation- Building (2,497)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember		  
Encumbrances (Unpaid Principal) (6,612)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember		  
Year of Acquisition 2011  
Life of Depreciation 40 years  
Copper Mill Apartments    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Austin, TX  
Initial Cost, Land 3,472us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember		  
Initial Cost, Building 13,958us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember		  
Gross Carrying Amount, Land 3,472us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember		 [1]  
Gross Carrying Amount, Building 14,426us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember		 [1]  
Accumulated Depreciation- Building (2,746)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember		  
Encumbrances (Unpaid Principal) (7,200)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember		  
Year of Acquisition 2011  
Life of Depreciation 40 years  
Cumberland Glen Apartments    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Smyrna, GA  
Initial Cost, Land 3,100us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember		  
Initial Cost, Building 13,166us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember		  
Gross Carrying Amount, Land 3,100us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember		 [1]  
Gross Carrying Amount, Building 13,639us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember		 [1]  
Accumulated Depreciation- Building (2,581)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember		  
Encumbrances (Unpaid Principal) (6,759)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember		  
Year of Acquisition 2011  
Life of Depreciation 40 years  
Heritage Trace Apartments    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Newport News, VA  
Initial Cost, Land 2,673us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember		  
Initial Cost, Building 10,761us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember		  
Gross Carrying Amount, Land 2,673us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember		 [1]  
Gross Carrying Amount, Building 11,215us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember		 [1]  
Accumulated Depreciation- Building (2,150)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember		  
Encumbrances (Unpaid Principal) (5,388)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember		  
Year of Acquisition 2011  
Life of Depreciation 40 years  
Belle Creek Apartments    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Henderson, CO  
Initial Cost, Land 1,890us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember		  
Initial Cost, Building 7,596us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember		  
Gross Carrying Amount, Land 1,890us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember		 [1]  
Gross Carrying Amount, Building 8,051us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember		 [1]  
Accumulated Depreciation- Building (1,372)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember		  
Encumbrances (Unpaid Principal) (10,575)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember		  
Year of Acquisition 2011  
Life of Depreciation 40 years  
Runaway Bay Apartments    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Indianapolis, IN  
Initial Cost, Land 3,079us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember		  
Initial Cost, Building 12,318us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember		  
Gross Carrying Amount, Land 3,079us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember		 [1]  
Gross Carrying Amount, Building 12,631us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember		 [1]  
Accumulated Depreciation- Building (732)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember		  
Encumbrances (Unpaid Principal) (10,033)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember		  
Year of Acquisition 2012  
Life of Depreciation 40 years  
Tresa At Arrowhead    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Phoenix, AZ  
Initial Cost, Land 7,080us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember		  
Initial Cost, Building 28,500us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember		  
Gross Carrying Amount, Land 7,080us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember		 [1]  
Gross Carrying Amount, Building 28,976us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember		 [1]  
Accumulated Depreciation- Building (4,262)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember		  
Encumbrances (Unpaid Principal) (27,500)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember		  
Year of Acquisition 2011  
Life of Depreciation 40 years  
The Crossings    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Phoenix, AZ  
Initial Cost, Land 4,600us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TheCrossingsMember		  
Initial Cost, Building 17,948us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TheCrossingsMember		  
Gross Carrying Amount, Land 4,600us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TheCrossingsMember		 [1]  
Gross Carrying Amount, Building 18,210us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TheCrossingsMember		 [1]  
Accumulated Depreciation- Building (505)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TheCrossingsMember		  
Encumbrances (Unpaid Principal) (15,313)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TheCrossingsMember		  
Year of Acquisition 2013  
Life of Depreciation 40 years  
Berkshire Square Apartments    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Phoenix, AZ  
Initial Cost, Land 2,650us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember		  
Initial Cost, Building 10,319us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember		  
Gross Carrying Amount, Land 2,650us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember		 [1]  
Gross Carrying Amount, Building 10,522us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember		 [1]  
Accumulated Depreciation- Building (334)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember		  
Encumbrances (Unpaid Principal) (8,612)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember		  
Year of Acquisition 2013  
Life of Depreciation 40 years  
Centrepoint Apartments    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Tucson, AZ  
Initial Cost, Land 5,620us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember		  
Initial Cost, Building 22,720us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember		  
Gross Carrying Amount, Land 5,620us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember		 [1]  
Gross Carrying Amount, Building 23,183us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember		 [1]  
Accumulated Depreciation- Building (2,920)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember		  
Encumbrances (Unpaid Principal) (17,600)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember		  
Year of Acquisition 2011  
Life of Depreciation 40 years  
Reserve at Eagle Ridge    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Waukegan, IL  
Initial Cost, Land 5,800us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember		  
Initial Cost, Building 22,743us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember		  
Gross Carrying Amount, Land 5,800us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember		 [1]  
Gross Carrying Amount, Building 22,845us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember		 [1]  
Accumulated Depreciation- Building (528)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember		  
Encumbrances (Unpaid Principal) (18,850)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Windrush    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Edmond, OK  
Initial Cost, Land 1,677us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WindrushMember		  
Initial Cost, Building 7,464us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WindrushMember		  
Gross Carrying Amount, Land 1,677us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WindrushMember		 [1]  
Gross Carrying Amount, Building 7,507us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WindrushMember		 [1]  
Accumulated Depreciation- Building (155)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WindrushMember		  
Encumbrances (Unpaid Principal) (5,948)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WindrushMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Heritage Park    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Oklahoma, OK  
Initial Cost, Land 4,234us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageParkMember		  
Initial Cost, Building 12,232us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageParkMember		  
Gross Carrying Amount, Land 4,234us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageParkMember		 [1]  
Gross Carrying Amount, Building 12,385us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageParkMember		 [1]  
Accumulated Depreciation- Building (284)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageParkMember		  
Encumbrances (Unpaid Principal) (10,706)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageParkMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Raindance    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Oklahoma, OK  
Initial Cost, Land 3,502us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RaindanceMember		  
Initial Cost, Building 10,033us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RaindanceMember		  
Gross Carrying Amount, Land 3,502us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RaindanceMember		 [1]  
Gross Carrying Amount, Building 10,215us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RaindanceMember		 [1]  
Accumulated Depreciation- Building (234)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RaindanceMember		  
Encumbrances (Unpaid Principal) (8,864)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RaindanceMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Augusta    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Oklahoma, OK  
Initial Cost, Land 1,296us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_AugustaMember		  
Initial Cost, Building 9,930us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_AugustaMember		  
Gross Carrying Amount, Land 1,296us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_AugustaMember		 [1]  
Gross Carrying Amount, Building 10,012us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_AugustaMember		 [1]  
Accumulated Depreciation- Building (193)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_AugustaMember		  
Encumbrances (Unpaid Principal) (7,253)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_AugustaMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Invitational    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Oklahoma, OK  
Initial Cost, Land 1,924us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_InvitationalMember		  
Initial Cost, Building 16,852us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_InvitationalMember		  
Gross Carrying Amount, Land 1,924us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_InvitationalMember		 [1]  
Gross Carrying Amount, Building 17,006us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_InvitationalMember		 [1]  
Accumulated Depreciation- Building (321)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_InvitationalMember		  
Encumbrances (Unpaid Principal) (12,168)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_InvitationalMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
King's Landing    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Creve Coeur, MO  
Initial Cost, Land 2,513us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember		  
Initial Cost, Building 29,873us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember		  
Gross Carrying Amount, Land 2,513us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember		 [1]  
Gross Carrying Amount, Building 29,890us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember		 [1]  
Accumulated Depreciation- Building (560)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember		  
Encumbrances (Unpaid Principal) (21,200)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Carrington    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Little Rock, AR  
Initial Cost, Land 1,715us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonMember		  
Initial Cost, Building 19,526us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonMember		  
Gross Carrying Amount, Land 1,715us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonMember		 [1]  
Gross Carrying Amount, Building 19,695us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonMember		 [1]  
Accumulated Depreciation- Building (301)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonMember		  
Encumbrances (Unpaid Principal) (14,235)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Arbors at the Reservoir    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Ridgeland, MS  
Initial Cost, Land 4,050us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsAtTheReservoirMember		  
Initial Cost, Building 15,946us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsAtTheReservoirMember		  
Gross Carrying Amount, Land 4,050us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsAtTheReservoirMember		 [1]  
Gross Carrying Amount, Building 16,345us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsAtTheReservoirMember		 [1]  
Accumulated Depreciation- Building (167)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsAtTheReservoirMember		  
Encumbrances (Unpaid Principal) (13,150)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsAtTheReservoirMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Walnut Hill    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Cordova, TN  
Initial Cost, Land 2,230us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember		  
Initial Cost, Building 25,251us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember		  
Gross Carrying Amount, Land 2,230us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember		 [1]  
Gross Carrying Amount, Building 25,288us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember		 [1]  
Accumulated Depreciation- Building (211)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember		  
Encumbrances (Unpaid Principal) (18,650)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Lenoxplace    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Raleight, NC  
Initial Cost, Land 3,480us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember		  
Initial Cost, Building 20,482us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember		  
Gross Carrying Amount, Land 3,480us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember		 [1]  
Gross Carrying Amount, Building 20,606us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember		 [1]  
Accumulated Depreciation- Building (128)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember		  
Encumbrances (Unpaid Principal) (15,991)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Stonebridge Crossing    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Memphis, TN  
Initial Cost, Land 3,100us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember		  
Initial Cost, Building 26,223us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember		  
Gross Carrying Amount, Land 3,100us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember		 [1]  
Gross Carrying Amount, Building 26,253us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember		 [1]  
Accumulated Depreciation- Building (164)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember		  
Encumbrances (Unpaid Principal) (19,370)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Bennington Pond    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Groveport, OH  
Initial Cost, Land 2,400us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember		  
Initial Cost, Building 14,828us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember		  
Gross Carrying Amount, Land 2,400us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember		 [1]  
Gross Carrying Amount, Building 14,844us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember		 [1]  
Accumulated Depreciation- Building (31)irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember		  
Encumbrances (Unpaid Principal) (11,375)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Prospect Park    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Louisville, KY  
Initial Cost, Land 2,837us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember		  
Initial Cost, Building 11,193us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember		  
Gross Carrying Amount, Land 2,837us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember		 [1]  
Gross Carrying Amount, Building 11,193us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember		 [1]  
Accumulated Depreciation- Building 0irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember		  
Encumbrances (Unpaid Principal) (9,230)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Brookside    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Louisville, KY  
Initial Cost, Land 3,947us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember		  
Initial Cost, Building 16,502us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember		  
Gross Carrying Amount, Land 3,942us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember		 [1]  
Gross Carrying Amount, Building 16,502us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember		 [1]  
Accumulated Depreciation- Building 0irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember		  
Encumbrances (Unpaid Principal) (13,455)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Jamestown    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Louisville, KY  
Initial Cost, Land 7,034us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember		  
Initial Cost, Building 27,730us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember		  
Gross Carrying Amount, Land 7,034us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember		 [1]  
Gross Carrying Amount, Building 27,730us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember		 [1]  
Accumulated Depreciation- Building 0irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember		  
Encumbrances (Unpaid Principal) (22,880)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Meadows    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Louisville, KY  
Initial Cost, Land 6,857us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember		  
Initial Cost, Building 30,030us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember		  
Gross Carrying Amount, Land 6,857us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember		 [1]  
Gross Carrying Amount, Building 30,030us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember		 [1]  
Accumulated Depreciation- Building 0irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember		  
Encumbrances (Unpaid Principal) (24,245)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Oxmoor    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Louisville, KY  
Initial Cost, Land 7,411us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember		  
Initial Cost, Building 47,095us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember		  
Gross Carrying Amount, Land 7,411us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember		 [1]  
Gross Carrying Amount, Building 47,095us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember		 [1]  
Accumulated Depreciation- Building 0irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember		  
Encumbrances (Unpaid Principal) (35,815)us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Stonebridge At The Ranch    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Little Rock, AR  
Initial Cost, Land 3,315us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeAtTheRanchMember		  
Initial Cost, Building 27,954us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeAtTheRanchMember		  
Gross Carrying Amount, Land 3,315us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeAtTheRanchMember		 [1]  
Gross Carrying Amount, Building 27,954us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeAtTheRanchMember		 [1]  
Accumulated Depreciation- Building 0irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeAtTheRanchMember		  
Encumbrances (Unpaid Principal) 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeAtTheRanchMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Iron Rock Ranch    
Real Estate and Accumulated Depreciation [Line Items]    
Description Apartment  
Location Austin, TX  
Initial Cost, Land 5,860us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_IronRockRanchMember		  
Initial Cost, Building 28,911us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_IronRockRanchMember		  
Gross Carrying Amount, Land 5,860us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_IronRockRanchMember		 [1]  
Gross Carrying Amount, Building 28,911us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_IronRockRanchMember		 [1]  
Accumulated Depreciation- Building 0irt_RealEstateAccumulatedDepreciationBuilding
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_IronRockRanchMember		  
Encumbrances (Unpaid Principal) 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_IronRockRanchMember		  
Year of Acquisition 2014  
Life of Depreciation 40 years  
Building    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 5,384us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Crestmont Apartments    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 309us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Copper Mill Apartments    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 468us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Cumberland Glen Apartments    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 473us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Heritage Trace Apartments    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 454us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Belle Creek Apartments    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 455us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Runaway Bay Apartments    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 313us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Tresa At Arrowhead    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 476us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | The Crossings    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 262us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TheCrossingsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Berkshire Square Apartments    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 203us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Centrepoint Apartments    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 463us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Reserve at Eagle Ridge    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 102us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Windrush    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 43us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WindrushMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Heritage Park    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 153us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageParkMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Raindance    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 182us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RaindanceMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Augusta    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 82us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_AugustaMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Invitational    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 154us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_InvitationalMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | King's Landing    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 17us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Carrington    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 169us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Arbors at the Reservoir    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 399us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsAtTheReservoirMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Walnut Hill    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 37us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Lenoxplace    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 124us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Stonebridge Crossing    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 30us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Bennington Pond    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 16us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Prospect Park    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Brookside    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Jamestown    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Meadows    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Oxmoor    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Stonebridge At The Ranch    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeAtTheRanchMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Building | Iron Rock Ranch    
Real Estate and Accumulated Depreciation [Line Items]    
Cost of Improvements, net of Retirements $ 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_IronRockRanchMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
[1] The aggregate cost basis for federal income tax purposes of our investments in real estate approximates the carrying amount at December 31, 2014.