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v3.19.3.a.u2

Summary of Disposition of Property's (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Real Estate [Abstract] |  |  |
Gain (loss) related to property includes defeasance costs | $ 7,417 | $ 911 | $ 4,251

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- Definition Gains losses on sales of investment real estate defeasance costs. + References No definition available. + Details
Name: | irt_GainsLossesOnSalesOfInvestmentRealEstateDefeasanceCosts
Namespace Prefix: | irt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration