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Summary of Acquisitions (Parenthetical) (Detail) $ in Thousands		12 Months Ended
	Sep. 03, 2017 USD ($) Property	Dec. 31, 2019 USD ($) Property	Dec. 31, 2018 USD ($) Property
Business Acquisition [Line Items]
Number of units in real estate properties acquired | Property		806	2,379
Purchase price | $		$ 128,925	$ 272,948
HPI Portfolio
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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Namespace Prefix:	irt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- 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

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Period Type: