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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
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     $ 9.31us-gaap_SharePrice                   $ 8.95us-gaap_SharePrice $ 8.60us-gaap_SharePrice        
Proceeds from issuance of common stock, net     $ 189,587us-gaap_ProceedsFromIssuanceOfCommonStock $ 31,153us-gaap_ProceedsFromIssuanceOfCommonStock $ 3,193us-gaap_ProceedsFromIssuanceOfCommonStock                          
Preferred stock redemption price       137us-gaap_StockRedeemedOrCalledDuringPeriodValue                            
Preferred stock, shares outstanding     0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding                            
Non-controlling interest distribution rate $ 2.78us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit $ 2.78us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit                                
Preferred stock redemption price                     10us-gaap_PreferredStockRedemptionPricePerShare              
Underwritten public offering                                    
Shareholders Equity [Line Items]                                    
Issuance of shares           6,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ irt_IssuanceOfCommonStockAxis
= irt_UnderwrittenPublicOfferingMember
8,050,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ irt_IssuanceOfCommonStockAxis
= irt_UnderwrittenPublicOfferingMember
8,050,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ irt_IssuanceOfCommonStockAxis
= irt_UnderwrittenPublicOfferingMember
                   
Share price           $ 9.60us-gaap_SharePrice
/ irt_IssuanceOfCommonStockAxis
= irt_UnderwrittenPublicOfferingMember
$ 9.50us-gaap_SharePrice
/ irt_IssuanceOfCommonStockAxis
= irt_UnderwrittenPublicOfferingMember
$ 8.30us-gaap_SharePrice
/ irt_IssuanceOfCommonStockAxis
= irt_UnderwrittenPublicOfferingMember
                   
Proceeds from issuance of common stock, gross           57,600irt_ProceedsFromIssuanceOfCommonStockGross
/ irt_IssuanceOfCommonStockAxis
= irt_UnderwrittenPublicOfferingMember
76,475irt_ProceedsFromIssuanceOfCommonStockGross
/ irt_IssuanceOfCommonStockAxis
= irt_UnderwrittenPublicOfferingMember
66,815irt_ProceedsFromIssuanceOfCommonStockGross
/ irt_IssuanceOfCommonStockAxis
= irt_UnderwrittenPublicOfferingMember
34,000irt_ProceedsFromIssuanceOfCommonStockGross
/ irt_IssuanceOfCommonStockAxis
= irt_UnderwrittenPublicOfferingMember
                 
Proceeds from issuance of common stock, net           54,704us-gaap_ProceedsFromIssuanceOfCommonStock
/ irt_IssuanceOfCommonStockAxis
= irt_UnderwrittenPublicOfferingMember
72,002us-gaap_ProceedsFromIssuanceOfCommonStock
/ irt_IssuanceOfCommonStockAxis
= irt_UnderwrittenPublicOfferingMember
62,718us-gaap_ProceedsFromIssuanceOfCommonStock
/ irt_IssuanceOfCommonStockAxis
= irt_UnderwrittenPublicOfferingMember
31,113us-gaap_ProceedsFromIssuanceOfCommonStock
/ irt_IssuanceOfCommonStockAxis
= irt_UnderwrittenPublicOfferingMember
                 
Common stock sold                 4,000,000us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ irt_IssuanceOfCommonStockAxis
= irt_UnderwrittenPublicOfferingMember
                 
Common stock offering price                 $ 8.50irt_CommonStockOfferingPrice
/ irt_IssuanceOfCommonStockAxis
= irt_UnderwrittenPublicOfferingMember
                 
Noncontrolling Interest | Iron Rock Ranch                                    
Shareholders Equity [Line Items]                                    
Number of limited units issued                             918,098us-gaap_LimitedPartnersCapitalAccountUnitsIssued
/ us-gaap_RealEstatePropertiesAxis
= irt_IronRockRanchMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
     
Limited units issued value                             8,550us-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                               4,929us-gaap_LimitedPartnersCapitalAccountUnitsIssued
/ us-gaap_RealEstatePropertiesAxis
= irt_BenningtonPondMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Limited units issued value                               48us-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                                 222,062us-gaap_LimitedPartnersCapitalAccountUnitsIssued
/ us-gaap_RealEstatePropertiesAxis
= irt_CarringtonMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Limited units issued value                                 1,986us-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 5,274,900us-gaap_PartnersCapitalAccountUnitsConverted
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
                                 
Walnut Hill | Noncontrolling Interest                                    
Shareholders Equity [Line Items]                                    
Number of limited units issued                                   137,361us-gaap_LimitedPartnersCapitalAccountUnitsIssued
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= irt_WalnutHillMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Limited units issued value                                   1,377us-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   $ 0.00163934irt_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   $ 0.00163934irt_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   $ 0.00171233irt_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   $ 0.00171233irt_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   $ 1,000.00us-gaap_SharePrice
/ us-gaap_StatementClassOfStockAxis
= irt_SeriesPreferredStockMember
                               
Preferred stock rate   $ 0.34722222irt_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                       125us-gaap_StockRedeemedOrCalledDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= irt_SeriesPreferredStockMember
           
Preferred stock redemption price                       140us-gaap_StockRedeemedOrCalledDuringPeriodValue
/ us-gaap_StatementClassOfStockAxis
= irt_SeriesPreferredStockMember
           
Preferred stock, shares outstanding                       0us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= irt_SeriesPreferredStockMember
           
Series B Preferred Units                                    
Shareholders Equity [Line Items]                                    
Preferred stock, shares redeemed                       350us-gaap_StockRedeemedOrCalledDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
           
Preferred stock redemption price       3,500us-gaap_StockRedeemedOrCalledDuringPeriodValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
              3,500us-gaap_StockRedeemedOrCalledDuringPeriodValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
           
Preferred stock, shares outstanding                       0us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
           
Series B Preferred Units | Noncontrolling Interest                                    
Shareholders Equity [Line Items]                                    
Preferred stock redemption price       $ 3,500us-gaap_StockRedeemedOrCalledDuringPeriodValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember