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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 |  |  | $ 400,509 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages |  |  |  |  |  |  |  |  |  |  | $ 100,803 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
Loans payable on real estate |  |  | 186,512 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt |  |  |  |  |  |  |  |  |  |  |
Fair value of debt assumed |  |  | 190,761 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities |  |  |  |  |  |  |  |  |  |  |
Iron Rock Ranch | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Amount | 22,900 us-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 |  | 19,370 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_StonebridgeCrossingMember | 19,370 us-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 |  |  | 9,230 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_ProspectParkMember |  | 9,230 us-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 |  |  | 13,455 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_BrookSideMember |  | 13,455 us-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 |  |  | 22,880 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_JamestownMember |  | 22,880 us-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 |  |  | 24,245 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_MeadowsMember |  | 24,245 us-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 |  |  | 35,815 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_OxmoorMember |  | 35,815 us-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 |  |  | 11,375 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_BenningtonPondMember |  |  | 11,375 us-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 |  |  | 15,991 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_LenoxplaceMember |  |  |  | 15,991 us-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 |  |  | 18,650 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_WalnutHillMember |  |  |  |  | 18,650 us-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 |  |  |  |  |  |  |  |  | 13,150 us-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 |  |  |  |  |  |  |  |  | 14,235 us-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 |  |  | 15,313 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_CrossingsMember |  |  |  |  |  |  | 15,313 us-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 |  |  | 21,200 us-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 |  |  |  |  |  |  |  |  |  |  | 21,200 us-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 |  |  | 46,471 us-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 |  |  |  |  |  |  |  |  |  |  |  | 45,763 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_OKCPortfolioMember |  |
Amortization schedule |  |  |  |  |  |  |  |  |  |  |  | 30 years |  |
Fair value of debt assumed |  |  |  |  |  |  |  |  |  |  |  | 48,312 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_OKCPortfolioMember |  |
Market interest rate |  |  |  |  |  |  |  |  |  |  |  | 2.80%irt_LongTermDebtInterestRate / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_OKCPortfolioMember |  |
Amortization of debt premium |  |  |  |  |  |  |  |  |  |  |  | 2,549 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_OKCPortfolioMember |  |
Reserve at Eagle Ridge |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Amount |  |  | $ 18,850 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_ReserveAtEagleRidgeMember |  |  |  |  |  |  |  |  |  | $ 18,850 us-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.

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