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Investments in Real Estate - Additional Information (Detail)	Mar. 31, 2021 Property
Real Estate Properties Base Purchase Price [Abstract]
Number of multifamily properties owned	56
Number of units located with multifamily properties	15,667

X

- Definition

Real estate properties base purchase price.

+ References

No definition available.

+ Details

Name:	irt_RealEstatePropertiesBasePurchasePriceAbstract
Namespace Prefix:	irt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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