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Organization (Detail) - Sep. 30, 2022 | Property | unit | jointVenture
--- | --- | --- | ---
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Number of multifamily properties owned | 122 | 122 |
Number of units located with multifamily properties | unit |  | 36,176 |
Number of joint ventures | jointVenture |  |  | 5

X
- Definition Number Of Joint Ventures + References No definition available. + Details
Name: | irt_NumberOfJointVentures
Namespace Prefix: | irt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- 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

X
- 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

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