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Equity Compensation Plans - Additional Information (Detail) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended
May 14, 2014
Oct. 29, 2013
Dec. 31, 2014
Jan. 31, 2014
Feb. 18, 2015
Dec. 31, 2013
Apr. 05, 2011
Jul. 29, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock, shares authorized     300,000,000us-gaap_CommonStockSharesAuthorized     300,000,000us-gaap_CommonStockSharesAuthorized    
Shares issued to Directors 9,000us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares 9,000us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares         3,000us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares  
Shares issued to Directors, aggregate value $ 81,000us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan $ 77,000us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan            
Share price $ 8.95us-gaap_SharePrice $ 8.60us-gaap_SharePrice $ 9.31us-gaap_SharePrice          
Selling commissions     0irt_SellingCommissionsAndDealerManagerFeesPaidForSharesSoldUnderDistributionReinvestmentProgram          
Amended and Restated Equity Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock, shares authorized               800,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_PlanNameAxis
= irt_AmendedAndRestatedEquityIncentivePlanMember
Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share price       $ 8.20us-gaap_SharePrice
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Common stock granted in period     40,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
40,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Common stock grant date value     37,000irt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
328,000irt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Awards vesting period       3 years        
Unearned compensation cost     219,000us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
         
Restricted Stock | Subsequent event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share price         $ 9.35us-gaap_SharePrice
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Common stock granted in period         100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Common stock grant date value         935,000irt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Awards vesting period         3 years      
SARs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Awards vesting period       3 years        
Options granted     80,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
80,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
       
Options grant date value       49,000irt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValueAmount
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
       
Intrinsic value exercisable     9,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
         
Intrinsic value outstanding     9,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
         
Unearned compensation cost     $ 33,000us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember