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Investments in Real Estate - Summary of Properties Classified As Held for Sale (Detail) $ in Thousands | Sep. 30, 2020 USD ($) Property
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Real Estate Properties [Line Items] |
Units | Property | 559
Real estate held for sale | $ | $ 49,264
Lakeshore on the Hill | Chattanooga, TN |
Real Estate Properties [Line Items] |
Units | Property | 123
Real estate held for sale | $ | $ 10,613
Trails at Signal Mountain | Chattanooga, TN |
Real Estate Properties [Line Items] |
Units | Property | 172
Real estate held for sale | $ | $ 13,487
Live Oak Trace | Baton Rouge, LA |
Real Estate Properties [Line Items] |
Units | Property | 264
Real estate held for sale | $ | $ 25,164

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- Definition Number of units in real estate properties held for sale. + References No definition available. + Details
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Namespace Prefix: | irt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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- Details
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- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=irt_LiveOakTraceMember
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Data Type: | na
Balance Type: |
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- Details
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