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Mortgage Indebtedness - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 12 Months Ended 0 Months Ended
Jan. 27, 2015
Dec. 29, 2014
Dec. 31, 2014
Dec. 08, 2014
Nov. 24, 2014
Oct. 24, 2014
Sep. 15, 2014
Jul. 15, 2014
May 27, 2014
Mar. 31, 2014
Feb. 28, 2014
Feb. 07, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]                          
Carrying Amount     $ 400,509us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages                   $ 100,803us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
Loans payable on real estate     186,512us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt                    
Fair value of debt assumed     190,761us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities                    
Iron Rock Ranch | Subsequent event                          
Mortgage Loans on Real Estate [Line Items]                          
Carrying Amount 22,900us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_IronRockRanchMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
                       
Effective interest rate 3.40%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_IronRockRanchMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
                       
Loan maturity date Feb. 01, 2025                        
Stonebridge Crossing                          
Mortgage Loans on Real Estate [Line Items]                          
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
                   
Loan maturity date     Jan. 01, 2022                    
Prospect Park                          
Mortgage Loans on Real Estate [Line Items]                          
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
                 
Loan maturity date     Jan. 01, 2025                    
Brookside                          
Mortgage Loans on Real Estate [Line Items]                          
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
                 
Loan maturity date     Jan. 01, 2025 Jan. 01, 2025                  
Jamestown                          
Mortgage Loans on Real Estate [Line Items]                          
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
                 
Loan maturity date     Jan. 01, 2025 Jan. 01, 2025                  
Meadows                          
Mortgage Loans on Real Estate [Line Items]                          
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
                 
Loan maturity date     Jan. 01, 2025 Jan. 01, 2025                  
Oxmoor                          
Mortgage Loans on Real Estate [Line Items]                          
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
                 
Loan maturity date     Jan. 01, 2025 Jan. 01, 2025                  
Bennington Pond                          
Mortgage Loans on Real Estate [Line Items]                          
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
               
Loan maturity date     Dec. 01, 2024                    
Lenoxplace                          
Mortgage Loans on Real Estate [Line Items]                          
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
             
Loan maturity date     Nov. 01, 2021                    
Walnut Hill                          
Mortgage Loans on Real Estate [Line Items]                          
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
           
Loan maturity date     Oct. 01, 2021                    
Arbors                          
Mortgage Loans on Real Estate [Line Items]                          
Carrying Amount               13,150us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsMember
         
Effective interest rate               4.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_ArborsMember
         
Loan maturity date               Aug. 01, 2024          
Carrington                          
Mortgage Loans on Real Estate [Line Items]                          
Carrying Amount               14,235us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonMember
         
Effective interest rate               4.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_CarringtonMember
         
Loan maturity date               Aug. 01, 2024          
Crossings                          
Mortgage Loans on Real Estate [Line Items]                          
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
       
Loan maturity date     Jun. 01, 2024                    
King's Landing                          
Mortgage Loans on Real Estate [Line Items]                          
Carrying Amount     21,200us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember
                   
Effective interest rate     4.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember
[1]             4.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember
     
Loan maturity date     Jun. 01, 2022                    
Loans payable on real estate                   21,200us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_KingsLandingMember
     
Interest payment period     Monthly             Monthly      
Principal date     Jun. 01, 2017             Jun. 01, 2017      
Amortization schedule     30 years             30 years      
OKC Portfolio                          
Mortgage Loans on Real Estate [Line Items]                          
Carrying Amount     46,471us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
                   
Effective interest rate     2.80%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
[2]               5.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
   
Loan maturity date     Apr. 01, 2016                    
Loans payable on real estate                     45,763us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
   
Amortization schedule                     30 years    
Fair value of debt assumed                     48,312us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
   
Market interest rate                     2.80%irt_LongTermDebtInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
   
Amortization of debt premium                     2,549us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_OKCPortfolioMember
   
Reserve at Eagle Ridge                          
Mortgage Loans on Real Estate [Line Items]                          
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
 
Loan maturity date     Mar. 01, 2024                    
[1] 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.
[2] 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.