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Summary of Information Concerning Indebtedness that Encumbered our Properties (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 27, 2013
Feb. 07, 2014
Feb. 28, 2014
Mar. 31, 2014
May 27, 2014
Sep. 15, 2014
Oct. 24, 2014
Nov. 24, 2014
Dec. 29, 2014
Dec. 08, 2014
Mortgage Loans on Real Estate [Line Items]                        
Carrying Amount $ 400,509us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages $ 100,803us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages                    
Outstanding Principal 417,369us-gaap_DebtInstrumentFaceAmount 103,303us-gaap_DebtInstrumentFaceAmount                    
Carrying amount 418,901us-gaap_SecuredDebt 103,303us-gaap_SecuredDebt                    
Effective Interest Rate 3.60%us-gaap_DebtInstrumentInterestRateEffectivePercentage 3.80%us-gaap_DebtInstrumentInterestRateEffectivePercentage                    
Belle Creek Apartments                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 10,575us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember
10,575us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember
                   
Carrying Amount 10,575us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember
10,575us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BelleCreekApartmentsMember
                   
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]                    
Maturity date Apr. 28, 2021 Apr. 28, 2021                    
Berkshire Square Apartments                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 8,612us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember
8,612us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember
                   
Carrying Amount 8,612us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember
8,612us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember
                   
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]                    
Maturity date Jan. 01, 2021 Jan. 01, 2021 Jan. 01, 2021                  
Carrying amount     8,612us-gaap_SecuredDebt
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember
                 
Effective Interest Rate     4.42%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BerkshireSquareApartmentsMember
                 
Centrepoint Apartments                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 17,600us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember
17,600us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember
                   
Carrying Amount 17,600us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember
17,600us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CentrepointApartmentsMember
                   
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]                    
Maturity date Jan. 01, 2019 Jan. 01, 2019                    
Copper Mill Apartments                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 7,200us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember
7,293us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember
                   
Carrying Amount 7,200us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember
7,293us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember
                   
Effective interest rate 5.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember
5.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CopperMillApartmentsMember
                   
Maturity date May 01, 2021 May 01, 2021                    
Crestmont Apartments                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 6,612us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember
6,698us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember
                   
Carrying Amount 6,612us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember
6,698us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember
                   
Effective interest rate 5.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember
5.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrestmontApartmentsMember
                   
Maturity date May 01, 2021 May 01, 2021                    
Cumberland Glen Apartments                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 6,759us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember
6,846us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember
                   
Carrying Amount 6,759us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember
6,846us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember
                   
Effective interest rate 5.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember
5.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CumberlandGlenApartmentsMember
                   
Maturity date May 01, 2021 May 01, 2021                    
Heritage Trace Apartments                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 5,388us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember
5,457us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember
                   
Carrying Amount 5,388us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember
5,457us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember
                   
Effective interest rate 5.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember
5.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_HeritageTraceApartmentsMember
                   
Maturity date May 01, 2021 May 01, 2021                    
Runaway Bay Apartments                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 10,033us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember
10,222us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember
                   
Carrying Amount 10,033us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember
10,222us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember
                   
Effective interest rate 3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember
3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_RunawayBayApartmentsMember
                   
Maturity date Nov. 01, 2022 Nov. 01, 2022                    
Tresa At Arrowhead                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 27,500us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember
27,500us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember
                   
Carrying Amount 27,500us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember
27,500us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_TresaAtArrowheadMember
                   
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]                    
Maturity date Apr. 28, 2021 Apr. 28, 2021                    
Reserve at Eagle Ridge                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 18,850us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember
                     
Carrying Amount 18,850us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember
    18,850us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember
               
Effective interest rate 4.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember
    4.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ReserveAtEagleRidgeMember
               
Maturity date Mar. 01, 2024                      
OKC Portfolio                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 44,939us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
                     
Carrying Amount 46,471us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
                     
Effective interest rate 2.80%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
[5]       5.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
             
Maturity date Apr. 01, 2016                      
King's Landing                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 21,200us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember
                     
Carrying Amount 21,200us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember
                     
Effective interest rate 4.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember
[6]         4.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember
           
Maturity date Jun. 01, 2022                      
Crossings                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 15,313us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrossingsMember
                     
Carrying Amount 15,313us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrossingsMember
          15,313us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrossingsMember
         
Effective interest rate 3.90%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrossingsMember
          3.90%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CrossingsMember
         
Maturity date Jun. 01, 2024                      
Carrington Park                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 14,235us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonParkMember
                     
Carrying Amount 14,235us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonParkMember
                     
Effective interest rate 4.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonParkMember
                     
Maturity date Aug. 01, 2024                      
Arbors at the Reservoir                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 13,150us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsAtTheReservoirMember
                     
Carrying Amount 13,150us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsAtTheReservoirMember
                     
Effective interest rate 4.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsAtTheReservoirMember
                     
Maturity date Aug. 01, 2024                      
Walnut Hill                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 18,650us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember
                     
Carrying Amount 18,650us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember
            18,650us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember
       
Effective interest rate 3.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember
            3.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember
       
Maturity date Oct. 01, 2021                      
Lenoxplace                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 15,991us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember
                     
Carrying Amount 15,991us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember
              15,991us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember
     
Effective interest rate 3.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember
              3.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_LenoxplaceMember
     
Maturity date Nov. 01, 2021                      
Bennington Pond                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 11,375us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember
                     
Carrying Amount 11,375us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember
                11,375us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember
   
Effective interest rate 3.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember
                3.70%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BenningtonPondMember
   
Maturity date Dec. 01, 2024                      
Stonebridge Crossing                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 19,370us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember
                     
Carrying Amount 19,370us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember
                  19,370us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember
 
Effective interest rate 3.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember
                  3.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_StonebridgeCrossingMember
 
Maturity date Jan. 01, 2022                      
Prospect Park                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 9,230us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember
                     
Carrying Amount 9,230us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember
                    9,230us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember
Effective interest rate 3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember
                    3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ProspectParkMember
Maturity date Jan. 01, 2025                      
Brookside                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 13,455us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember
                     
Carrying Amount 13,455us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember
                    13,455us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember
Effective interest rate 3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember
                    3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_BrookSideMember
Maturity date Jan. 01, 2025                     Jan. 01, 2025
Jamestown                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 22,880us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember
                     
Carrying Amount 22,880us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember
                    22,880us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember
Effective interest rate 3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember
                    3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_JamestownMember
Maturity date Jan. 01, 2025                     Jan. 01, 2025
Meadows                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 24,245us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember
                     
Carrying Amount 24,245us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember
                    24,245us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember
Effective interest rate 3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember
                    3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_MeadowsMember
Maturity date Jan. 01, 2025                     Jan. 01, 2025
Oxmoor                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 35,815us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember
                     
Carrying Amount 35,815us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember
                    35,815us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember
Effective interest rate 3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember
                    3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OxmoorMember
Maturity date Jan. 01, 2025                     Jan. 01, 2025
Mortgages Debt                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal 398,977us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
100,803us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
                   
Carrying Amount 400,509us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
100,803us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
                   
Effective interest rate 3.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
3.80%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
                   
Secured Credit Facility                        
Mortgage Loans on Real Estate [Line Items]                        
Outstanding Principal $ 18,392us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= irt_SecuredCreditFacilityMember
$ 2,500us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= irt_SecuredCreditFacilityMember
                   
Effective Interest Rate 2.70%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_CreditFacilityAxis
= irt_SecuredCreditFacilityMember
[7] 2.90%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_CreditFacilityAxis
= irt_SecuredCreditFacilityMember
[8]                    
Maturity Date Oct. 25, 2016 Oct. 25, 2016                    
[1] 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.
[2] Floating rate at 225 basis points over 30-day LIBOR. As of December 31, 2013, 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.
[8] Floating rate at 275 basis points over 30-day LIBOR. As of December 31, 2013, 30-day LIBOR was 0.17%. Interest only payments are due monthly.