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Stockholder Equity and Non-Controlling Interest - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended |  |  |  |  |  |
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May 07, 2013 | Feb. 28, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 25, 2014 | Jul. 21, 2014 | Jan. 29, 2014 | Aug. 13, 2013 | Oct. 10, 2013 | Jul. 25, 2013 | Aug. 19, 2013 | May 14, 2014 | Oct. 29, 2013 | Dec. 30, 2014 | Nov. 24, 2014 | May 07, 2014 | Aug. 28, 2014
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price |  |  | $ 9.31 us-gaap_SharePrice |  |  |  |  |  |  |  |  |  | $ 8.95 us-gaap_SharePrice | $ 8.60 us-gaap_SharePrice |  |  |  |
Proceeds from issuance of common stock, net |  |  | $ 189,587 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 31,153 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 3,193 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock redemption price |  |  |  | 137 us-gaap_StockRedeemedOrCalledDuringPeriodValue |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  |  | 0 us-gaap_PreferredStockSharesOutstanding | 0 us-gaap_PreferredStockSharesOutstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest distribution rate | $ 2.78 us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit | $ 2.78 us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock redemption price |  |  |  |  |  |  |  |  |  |  | 10 us-gaap_PreferredStockRedemptionPricePerShare |  |  |  |  |  |  |
Underwritten public offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares |  |  |  |  |  | 6,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / irt_IssuanceOfCommonStockAxis = irt_UnderwrittenPublicOfferingMember | 8,050,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / irt_IssuanceOfCommonStockAxis = irt_UnderwrittenPublicOfferingMember | 8,050,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / irt_IssuanceOfCommonStockAxis = irt_UnderwrittenPublicOfferingMember |  |  |  |  |  |  |  |  |  |
Share price |  |  |  |  |  | $ 9.60 us-gaap_SharePrice / irt_IssuanceOfCommonStockAxis = irt_UnderwrittenPublicOfferingMember | $ 9.50 us-gaap_SharePrice / irt_IssuanceOfCommonStockAxis = irt_UnderwrittenPublicOfferingMember | $ 8.30 us-gaap_SharePrice / irt_IssuanceOfCommonStockAxis = irt_UnderwrittenPublicOfferingMember |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock, gross |  |  |  |  |  | 57,600 irt_ProceedsFromIssuanceOfCommonStockGross / irt_IssuanceOfCommonStockAxis = irt_UnderwrittenPublicOfferingMember | 76,475 irt_ProceedsFromIssuanceOfCommonStockGross / irt_IssuanceOfCommonStockAxis = irt_UnderwrittenPublicOfferingMember | 66,815 irt_ProceedsFromIssuanceOfCommonStockGross / irt_IssuanceOfCommonStockAxis = irt_UnderwrittenPublicOfferingMember | 34,000 irt_ProceedsFromIssuanceOfCommonStockGross / irt_IssuanceOfCommonStockAxis = irt_UnderwrittenPublicOfferingMember |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock, net |  |  |  |  |  | 54,704 us-gaap_ProceedsFromIssuanceOfCommonStock / irt_IssuanceOfCommonStockAxis = irt_UnderwrittenPublicOfferingMember | 72,002 us-gaap_ProceedsFromIssuanceOfCommonStock / irt_IssuanceOfCommonStockAxis = irt_UnderwrittenPublicOfferingMember | 62,718 us-gaap_ProceedsFromIssuanceOfCommonStock / irt_IssuanceOfCommonStockAxis = irt_UnderwrittenPublicOfferingMember | 31,113 us-gaap_ProceedsFromIssuanceOfCommonStock / irt_IssuanceOfCommonStockAxis = irt_UnderwrittenPublicOfferingMember |  |  |  |  |  |  |  |  |
Common stock sold |  |  |  |  |  |  |  |  | 4,000,000 us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / irt_IssuanceOfCommonStockAxis = irt_UnderwrittenPublicOfferingMember |  |  |  |  |  |  |  |  |
Common stock offering price |  |  |  |  |  |  |  |  | $ 8.50 irt_CommonStockOfferingPrice / irt_IssuanceOfCommonStockAxis = irt_UnderwrittenPublicOfferingMember |  |  |  |  |  |  |  |  |
Noncontrolling Interest | Iron Rock Ranch |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of limited units issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 918,098 us-gaap_LimitedPartnersCapitalAccountUnitsIssued / us-gaap_RealEstatePropertiesAxis = irt_IronRockRanchMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |
Limited units issued value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,550 us-gaap_LimitedPartnersCapitalAccount / us-gaap_RealEstatePropertiesAxis = irt_IronRockRanchMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |
Noncontrolling Interest | Bennington Pond |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of limited units issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,929 us-gaap_LimitedPartnersCapitalAccountUnitsIssued / us-gaap_RealEstatePropertiesAxis = irt_BenningtonPondMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Limited units issued value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48 us-gaap_LimitedPartnersCapitalAccount / us-gaap_RealEstatePropertiesAxis = irt_BenningtonPondMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Noncontrolling Interest | Carrington |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of limited units issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 222,062 us-gaap_LimitedPartnersCapitalAccountUnitsIssued / us-gaap_RealEstatePropertiesAxis = irt_CarringtonMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Limited units issued value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,986 us-gaap_LimitedPartnersCapitalAccount / us-gaap_RealEstatePropertiesAxis = irt_CarringtonMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership interest received in exchange for issuance of common stock | 5,274,900 us-gaap_PartnersCapitalAccountUnitsConverted / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Walnut Hill | Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of limited units issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 137,361 us-gaap_LimitedPartnersCapitalAccountUnitsIssued / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_WalnutHillMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Limited units issued value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,377 us-gaap_LimitedPartnersCapitalAccount / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = irt_WalnutHillMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Distributions declared for the months of January through March 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest for months |  | January through March 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest per unit per day |  | $ 0.00163934 irt_MinorityInterestDistributionsPaidToCommonOperatingPartnershipUnitHoldersRatePerUnitPerDay / us-gaap_StatementScenarioAxis = irt_ScenarioOneMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions declared for the months of January through March 2013 | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock for months |  | January through June 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate of common stock |  | $ 0.00163934 irt_CommonStockDividendRatePerSharePerDay / us-gaap_InvestmentTypeAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = irt_ScenarioOneMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions declared for the months of April through June 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest for months |  | April through June 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest per unit per day |  | $ 0.00171233 irt_MinorityInterestDistributionsPaidToCommonOperatingPartnershipUnitHoldersRatePerUnitPerDay / us-gaap_StatementScenarioAxis = irt_ScenarioTwoMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions declared for the months of April through June 2013 | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock for months |  | April through June 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate of common stock |  | $ 0.00171233 irt_CommonStockDividendRatePerSharePerDay / us-gaap_InvestmentTypeAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = irt_ScenarioTwoMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions declared for the months of July through September 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest for months |  |  |  |  |  |  |  |  |  | July through September 2013 | July through September 2013 |  |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price |  | $ 1,000.00 us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = irt_SeriesPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock rate |  | $ 0.34722222 irt_PreferredStockDividendRatePerDay / us-gaap_StatementClassOfStockAxis = irt_SeriesPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred sock, percentage of annualized distribution rate |  | 12.50%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = irt_SeriesPreferredStockMember |  |  |  |  |  |  |  |  |  | 12.50%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = irt_SeriesPreferredStockMember |  |  |  |  |  |
Preferred stock, distribution payment date |  | Jun. 28, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares redeemed |  |  |  |  |  |  |  |  |  |  |  | 125 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = irt_SeriesPreferredStockMember |  |  |  |  |  |
Preferred stock redemption price |  |  |  |  |  |  |  |  |  |  |  | 140 us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = irt_SeriesPreferredStockMember |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = irt_SeriesPreferredStockMember |  |  |  |  |  |
Series B Preferred Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares redeemed |  |  |  |  |  |  |  |  |  |  |  | 350 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |
Preferred stock redemption price |  |  |  | 3,500 us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  | 3,500 us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |
Series B Preferred Units | Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock redemption price |  |  |  | $ 3,500 us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Minority interest distributions paid to common operating partnership unit holders rate per unit per day. + References No definition available. + Details
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