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Pro Forma of Financial Information Purport to Represent Results of Operations for Future Periods (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Real Estate Properties [Line Items]                      
Total revenue from acquisitions, as reported                 $ 23,477us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual $ 0us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual  
Net income (loss) allocable to common shares from acquisitions, as reported                 3,054us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual [1] 0us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual [1]  
Earnings (loss) per share                      
Basic-as reported $ 0.01us-gaap_EarningsPerShareBasic [2] $ 0.00us-gaap_EarningsPerShareBasic [2] $ (0.01)us-gaap_EarningsPerShareBasic [2] $ 0.19us-gaap_EarningsPerShareBasic [2] $ 0.03us-gaap_EarningsPerShareBasic [2] $ 0.03us-gaap_EarningsPerShareBasic [2] $ 0.01us-gaap_EarningsPerShareBasic [2] $ 0.01us-gaap_EarningsPerShareBasic [2] $ 0.14us-gaap_EarningsPerShareBasic $ 0.12us-gaap_EarningsPerShareBasic $ (0.45)us-gaap_EarningsPerShareBasic
Diluted-as reported $ 0.01us-gaap_EarningsPerShareDiluted [2] $ 0.00us-gaap_EarningsPerShareDiluted [2] $ (0.01)us-gaap_EarningsPerShareDiluted [2] $ 0.19us-gaap_EarningsPerShareDiluted [2] $ 0.03us-gaap_EarningsPerShareDiluted [2] $ 0.03us-gaap_EarningsPerShareDiluted [2] $ 0.01us-gaap_EarningsPerShareDiluted [2] $ 0.00us-gaap_EarningsPerShareDiluted [2] $ 0.14us-gaap_EarningsPerShareDiluted $ 0.12us-gaap_EarningsPerShareDiluted $ (0.45)us-gaap_EarningsPerShareDiluted
Pro forma revenue (unaudited)                 60,002us-gaap_BusinessAcquisitionsProFormaRevenue 58,954us-gaap_BusinessAcquisitionsProFormaRevenue  
Pro forma net income (loss) allocable to common shares (unaudited)                 $ 7,508us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss $ 5,847us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss  
Basic-pro forma (unaudited)                 $ 0.35us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic $ 1.10us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic  
Diluted-pro forma (unaudited)                 $ 0.35us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted $ 1.10us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted  
As reported                      
Earnings (loss) per share                      
Basic-as reported                 $ 0.16us-gaap_EarningsPerShareBasic
/ irt_EarningsPerShareAxis
= irt_ReportedMember		 $ 0.00us-gaap_EarningsPerShareBasic
/ irt_EarningsPerShareAxis
= irt_ReportedMember		  
Diluted-as reported                 $ 0.14us-gaap_EarningsPerShareDiluted
/ irt_EarningsPerShareAxis
= irt_ReportedMember		 $ 0.00us-gaap_EarningsPerShareDiluted
/ irt_EarningsPerShareAxis
= irt_ReportedMember		  
[1] The fair value of a property acquired exceeded the purchase price and a gain of $2,882 was recorded.
[2] The summation of quarterly per share amounts do not equal the full year amounts.