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Summary of Information Concerning Indebtedness that Encumbered our Properties (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended 0 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Jan. 27, 2015
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 421,388us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages 398,977us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages  
Mortgage indebtedness, carrying amount 422,613us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages 400,509us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages  
Indebtedness, outstanding principal 421,388us-gaap_DebtInstrumentFaceAmount 417,369us-gaap_DebtInstrumentFaceAmount  
Indebtedness, carrying amount 422,613us-gaap_SecuredDebt 418,901us-gaap_SecuredDebt  
Indebtedness, effective interest rate 3.60%us-gaap_DebtInstrumentInterestRateEffectivePercentage    
Weighted Average      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, effective interest rate 3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
 
Indebtedness, effective interest rate   3.60%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
 
Belle Creek Apartments      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 10,575us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember
10,575us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember
 
Mortgage indebtedness, carrying amount 10,575us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember
10,575us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember
 
Mortgage indebtedness, effective interest rate 2.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember
[1] 2.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember
[2]  
Mortgage indebtedness, maturity date Apr. 28, 2021 Apr. 28, 2021  
Berkshire Square Apartments      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 8,612us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember
8,612us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember
 
Mortgage indebtedness, carrying amount 8,612us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember
8,612us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember
 
Mortgage indebtedness, effective interest rate 4.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember
[3] 4.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember
[3]  
Mortgage indebtedness, maturity date Jan. 01, 2021 Jan. 01, 2021  
Centrepoint Apartments      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 17,520us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember
17,600us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember
 
Mortgage indebtedness, carrying amount 17,520us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember
17,600us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember
 
Mortgage indebtedness, effective interest rate 3.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember
[4] 3.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember
[4]  
Mortgage indebtedness, maturity date Jan. 01, 2019 Jan. 01, 2019  
Copper Mill Apartments      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 7,174us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember
7,200us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember
 
Mortgage indebtedness, carrying amount 7,174us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember
7,200us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember
 
Mortgage indebtedness, effective interest rate 5.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember
5.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember
 
Mortgage indebtedness, maturity date May 01, 2021 May 01, 2021  
Crestmont Apartments      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 6,589us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember
6,612us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember
 
Mortgage indebtedness, carrying amount 6,589us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember
6,612us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember
 
Mortgage indebtedness, effective interest rate 5.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember
5.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember
 
Mortgage indebtedness, maturity date May 01, 2021 May 01, 2021  
Cumberland Glen Apartments      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 6,735us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember
6,759us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember
 
Mortgage indebtedness, carrying amount 6,735us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember
6,759us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember
 
Mortgage indebtedness, effective interest rate 5.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember
5.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember
 
Mortgage indebtedness, maturity date May 01, 2021 May 01, 2021  
Heritage Trace Apartments      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 5,369us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember
5,388us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember
 
Mortgage indebtedness, carrying amount 5,369us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember
5,388us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember
 
Mortgage indebtedness, effective interest rate 5.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember
5.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember
 
Mortgage indebtedness, maturity date May 01, 2021 May 01, 2021  
Runaway Bay Apartments      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 9,983us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember
10,033us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember
 
Mortgage indebtedness, carrying amount 9,983us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember
10,033us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember
 
Mortgage indebtedness, effective interest rate 3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember
3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember
 
Mortgage indebtedness, maturity date Nov. 01, 2022 Nov. 01, 2022  
Tresa At Arrowhead      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 27,500us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember
27,500us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember
 
Mortgage indebtedness, carrying amount 27,500us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember
27,500us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember
 
Mortgage indebtedness, effective interest rate 2.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember
[1] 2.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember
[2]  
Mortgage indebtedness, maturity date Apr. 28, 2021 Apr. 28, 2021  
Reserve at Eagle Ridge      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 18,850us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember
18,850us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember
 
Mortgage indebtedness, carrying amount 18,850us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember
18,850us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember
 
Mortgage indebtedness, effective interest rate 4.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember
4.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember
 
Mortgage indebtedness, maturity date Mar. 01, 2024 Mar. 01, 2024  
OKC Portfolio      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 44,672us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
44,939us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
 
Mortgage indebtedness, carrying amount 45,897us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
46,471us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
 
Mortgage indebtedness, effective interest rate 2.80%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
[5] 2.80%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
[5]  
Mortgage indebtedness, maturity date Apr. 01, 2016 Apr. 01, 2016  
King's Landing      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 21,200us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember
21,200us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember
 
Mortgage indebtedness, carrying amount 21,200us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember
21,200us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember
 
Mortgage indebtedness, effective interest rate 4.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember
[6] 4.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember
[6]  
Mortgage indebtedness, maturity date Jun. 01, 2022 Jun. 01, 2022  
Crossings      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 15,313us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrossingsMember
15,313us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrossingsMember
 
Mortgage indebtedness, carrying amount 15,313us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrossingsMember
15,313us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrossingsMember
 
Mortgage indebtedness, effective interest rate 3.90%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrossingsMember
3.90%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrossingsMember
 
Mortgage indebtedness, maturity date Jun. 01, 2024 Jun. 01, 2024  
Carrington Park      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 14,235us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonParkMember
14,235us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonParkMember
 
Mortgage indebtedness, carrying amount 14,235us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonParkMember
14,235us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonParkMember
 
Mortgage indebtedness, effective interest rate 4.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonParkMember
4.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonParkMember
 
Mortgage indebtedness, maturity date Aug. 01, 2024 Aug. 01, 2024  
Arbors at the Reservoir      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 13,150us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsAtTheReservoirMember
13,150us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsAtTheReservoirMember
 
Mortgage indebtedness, carrying amount 13,150us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsAtTheReservoirMember
13,150us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsAtTheReservoirMember
 
Mortgage indebtedness, effective interest rate 4.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsAtTheReservoirMember
4.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsAtTheReservoirMember
 
Mortgage indebtedness, maturity date Aug. 01, 2024 Aug. 01, 2024  
Walnut Hill      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 18,650us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember
18,650us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember
 
Mortgage indebtedness, carrying amount 18,650us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember
18,650us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember
 
Mortgage indebtedness, effective interest rate 3.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember
3.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember
 
Mortgage indebtedness, maturity date Oct. 01, 2021 Oct. 01, 2021  
Lenoxplace      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 15,991us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember
15,991us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember
 
Mortgage indebtedness, carrying amount 15,991us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember
15,991us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember
 
Mortgage indebtedness, effective interest rate 3.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember
3.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember
 
Mortgage indebtedness, maturity date Nov. 01, 2021 Nov. 01, 2021  
Bennington Pond      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 11,375us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember
11,375us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember
 
Mortgage indebtedness, carrying amount 11,375us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember
11,375us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember
 
Mortgage indebtedness, effective interest rate 3.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember
3.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember
 
Mortgage indebtedness, maturity date Dec. 01, 2024 Dec. 01, 2024  
Stonebridge Crossing      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 19,370us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember
19,370us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember
 
Mortgage indebtedness, carrying amount 19,370us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember
19,370us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember
 
Mortgage indebtedness, effective interest rate 3.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember
3.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember
 
Mortgage indebtedness, maturity date Jan. 01, 2022 Jan. 01, 2022  
Prospect Park      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 9,230us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember
9,230us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember
 
Mortgage indebtedness, carrying amount 9,230us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember
9,230us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember
 
Mortgage indebtedness, effective interest rate 3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember
3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember
 
Mortgage indebtedness, maturity date Jan. 01, 2025 Jan. 01, 2025  
Brookside      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 13,455us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember
13,455us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember
 
Mortgage indebtedness, carrying amount 13,455us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember
13,455us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember
 
Mortgage indebtedness, effective interest rate 3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember
3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember
 
Mortgage indebtedness, maturity date Jan. 01, 2025 Jan. 01, 2025  
Jamestown      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 22,880us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember
22,880us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember
 
Mortgage indebtedness, carrying amount 22,880us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember
22,880us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember
 
Mortgage indebtedness, effective interest rate 3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember
3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember
 
Mortgage indebtedness, maturity date Jan. 01, 2025 Jan. 01, 2025  
Meadows      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 24,245us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember
24,245us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember
 
Mortgage indebtedness, carrying amount 24,245us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember
24,245us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember
 
Mortgage indebtedness, effective interest rate 3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember
3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember
 
Mortgage indebtedness, maturity date Jan. 01, 2025 Jan. 01, 2025  
Oxmoor      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 35,815us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember
35,815us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember
 
Mortgage indebtedness, carrying amount 35,815us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember
35,815us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember
 
Mortgage indebtedness, effective interest rate 3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember
3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember
 
Mortgage indebtedness, maturity date Jan. 01, 2025 Jan. 01, 2025  
Iron Rock Ranch      
Mortgage Loans on Real Estate [Line Items]      
Mortgage indebtedness, outstanding principal 22,900us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_IronRockRanchMember
   
Mortgage indebtedness, carrying amount 22,900us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_IronRockRanchMember
  22,900us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_IronRockRanchMember
Mortgage indebtedness, effective interest rate 3.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_IronRockRanchMember
  3.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_IronRockRanchMember
Mortgage indebtedness, maturity date Feb. 01, 2025   Feb. 01, 2025
Secured Credit Facility      
Mortgage Loans on Real Estate [Line Items]      
Secured credit facility, outstanding principal   18,392us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= irt_SecuredCreditFacilityMember
 
Secured credit facility, effective interest rate   2.70%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_CreditFacilityAxis
= irt_SecuredCreditFacilityMember
[7]  
Secured credit facility, maturity date   Oct. 25, 2016  
[1] Floating rate at 225 basis points over 30-day LIBOR. As of March 31, 2015, 30-day LIBOR was 0.18%. Interest only payments are due monthly. These mortgages are held by RAIT.
[2] Floating rate at 225 basis points over 30-day LIBOR. As of December 31, 2014, 30-day LIBOR was 0.17%. Interest only payments are due monthly. These mortgages are held by RAIT.
[3] Fixed rate. Interest only payments are due monthly. Beginning February 1, 2016, principal and interest payments are required based on a 30-year amortization schedule.
[4] Fixed rate. Interest only payments are due monthly. Beginning February 1, 2015, principal and interest payments are required based on a 30-year amortization schedule.
[5] Contractual interest rate is 5.6%. The debt was assumed and recorded at a premium that will be amortized to interest expense over the remaining term. Principal and interest payments are required based on a 30-year amortization schedule.
[6] Fixed rate. Interest only payments are due monthly. Beginning June 1, 2017, principal and interest payments are required based on a 30-year amortization schedule.
[7] Floating rate at 250 basis points over 30-day LIBOR. As of December 31, 2014, 30-day LIBOR was 0.17%. Interest only payments are due monthly.