The number of units in a real estate property acquired.

No definition available.

Name:	irt_NumberOfUnitsInRealEstatePropertyAcquired
Namespace Prefix:	irt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Payments to acquire real estate including transaction fees.

+ References

No definition available.

+ Details

Name:	irt_PaymentsToAcquireRealEstateIncludingTransactionFees
Namespace Prefix:	irt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Real estate property, location.

+ References

No definition available.

+ Details

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

- 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

- 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

- 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=119400593&loc=d3e572229-122910

+ Details

Name:	us-gaap_RealEstateHeldforsale
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

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

- Details

Name:	srt_StatementGeographicalAxis=stpr_NC
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=irt_IronRockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Investments in Real Estate - Additional Information (Detail) $ in Thousands	1 Months Ended	9 Months Ended
	Oct. 31, 2019 USD ($) Property	Sep. 30, 2019 USD ($) Property	Dec. 31, 2018 USD ($) Property
Real Estate Properties [Line Items]
Number of multifamily properties owned		57
Number of units located with multifamily properties		15,536
Real estate held for sale \| $		$ 32,381	$ 77,285
Number of units in real estate properties acquired		488
Purchase Price \| $		$ 76,000
Raleigh, NC \| Subsequent Event
Real Estate Properties [Line Items]
Number of units in real estate properties acquired	318
Purchase Price \| $	$ 52,925
Held-for-sale
Real Estate Properties [Line Items]
Number of multifamily properties owned		1	3
Held-for-sale \| Iron Rock [Member]
Real Estate Properties [Line Items]
Number of units located with multifamily properties		300
Real estate property location		Austin, TX
Real estate held for sale \| $		$ 32,381