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Investments in Real Estate - Additional Information (Detail) | Mar. 31, 2021 Property
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Real Estate Properties Base Purchase Price [Abstract] |
Number of multifamily properties owned | 56
Number of units located with multifamily properties | 15,667

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- Definition Real estate properties base purchase price. + References No definition available. + Details
Name: | irt_RealEstatePropertiesBasePurchasePriceAbstract
Namespace Prefix: | irt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant