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Summary of Acquisitions (Parenthetical) (Detail) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Sep. 03, 2017 USD ($) Property | Mar. 31, 2018 USD ($) Property
Business Acquisition [Line Items] |  |
Number of units in real estate properties acquired | Property |  | 1,263
Purchase Price | $ |  | $ 131,248
Acquisition of Nine-Property Portfolio First Phase Acquisition |  |
Business Acquisition [Line Items] |  |
Number of units in real estate properties acquired | Property | 2,352 |
Purchase Price | $ | $ 228,144 |

X
- Definition The number of units in a real estate property acquired. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Payments to acquire real estate including transaction fees. + References No definition available. + Details
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Namespace Prefix: | irt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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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Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |