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Summary of Properties Classified as Held for Sale (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($) Property	Dec. 31, 2017 USD ($)
Real Estate Properties [Line Items]
Units (unaudited) | Property	15,880
Net Carrying Value | $	$ 77,285,000
Held-for-sale
Real Estate Properties [Line Items]
Units (unaudited) | Property	832
Net Carrying Value | $	$ 77,285,000	$ 0
Held-for-sale | Reserve At Eagle Ridge [Member]
Real Estate Properties [Line Items]
Market	Chicago, IL
Units (unaudited) | Property	370
Net Carrying Value | $	$ 27,027,000
Held-for-sale | Carrington Park [Member]
Real Estate Properties [Line Items]
Market	Little Rock, AR
Units (unaudited) | Property	202
Net Carrying Value | $	$ 20,619,000
Held-for-sale | Stonebridge At The Ranch [Member]
Real Estate Properties [Line Items]
Market	Little Rock, AR
Units (unaudited) | Property	260
Net Carrying Value | $	$ 29,639,000

X

- Definition

Real estate property, market.

+ References

No definition available.

+ Details

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

X

- Definition

The number of units in a real estate property owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- 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=6879938&loc=d3e572229-122910

+ Details

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

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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X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=irt_StonebridgeAtTheRanchMember
Namespace Prefix:
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Balance Type:
Period Type: