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Summary of Disposition of Property's (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate [Abstract]
Gain (loss) related to property includes defeasance costs	$ 7,417	$ 911	$ 4,251

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- Definition

Gains losses on sales of investment real estate defeasance costs.

+ 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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- References

No definition available.

+ Details

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