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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
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,477 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual |  | $ 0 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual |  |
Net income (loss) allocable to common shares from acquisitions, as reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,054 us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual | [1] | 0 us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual | [1] |
Earnings (loss) per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic-as reported | $ 0.01 us-gaap_EarningsPerShareBasic | [2] | $ 0.00 us-gaap_EarningsPerShareBasic | [2] | $ (0.01)us-gaap_EarningsPerShareBasic | [2] | $ 0.19 us-gaap_EarningsPerShareBasic | [2] | $ 0.03 us-gaap_EarningsPerShareBasic | [2] | $ 0.03 us-gaap_EarningsPerShareBasic | [2] | $ 0.01 us-gaap_EarningsPerShareBasic | [2] | $ 0.01 us-gaap_EarningsPerShareBasic | [2] | $ 0.14 us-gaap_EarningsPerShareBasic |  | $ 0.12 us-gaap_EarningsPerShareBasic |  | $ (0.45)us-gaap_EarningsPerShareBasic
Diluted-as reported | $ 0.01 us-gaap_EarningsPerShareDiluted | [2] | $ 0.00 us-gaap_EarningsPerShareDiluted | [2] | $ (0.01)us-gaap_EarningsPerShareDiluted | [2] | $ 0.19 us-gaap_EarningsPerShareDiluted | [2] | $ 0.03 us-gaap_EarningsPerShareDiluted | [2] | $ 0.03 us-gaap_EarningsPerShareDiluted | [2] | $ 0.01 us-gaap_EarningsPerShareDiluted | [2] | $ 0.00 us-gaap_EarningsPerShareDiluted | [2] | $ 0.14 us-gaap_EarningsPerShareDiluted |  | $ 0.12 us-gaap_EarningsPerShareDiluted |  | $ (0.45)us-gaap_EarningsPerShareDiluted
Pro forma revenue (unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,002 us-gaap_BusinessAcquisitionsProFormaRevenue |  | 58,954 us-gaap_BusinessAcquisitionsProFormaRevenue |  |
Pro forma net income (loss) allocable to common shares (unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,508 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss |  | $ 5,847 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss |  |
Basic-pro forma (unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.35 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic |  | $ 1.10 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic |  |
Diluted-pro forma (unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.35 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted |  | $ 1.10 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted |  |
As reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic-as reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.16 us-gaap_EarningsPerShareBasic / irt_EarningsPerShareAxis = irt_ReportedMember |  | $ 0.00 us-gaap_EarningsPerShareBasic / irt_EarningsPerShareAxis = irt_ReportedMember |  |
Diluted-as reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.14 us-gaap_EarningsPerShareDiluted / irt_EarningsPerShareAxis = irt_ReportedMember |  | $ 0.00 us-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.

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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