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Investments in Real Estate - Summary of Properties Classified As Held for Sale (Detail) $ in Thousands	Sep. 30, 2020 USD ($) Property
Real Estate Properties [Line Items]
Units | Property	559
Real estate held for sale | $	$ 49,264
Lakeshore on the Hill | Chattanooga, TN
Real Estate Properties [Line Items]
Units | Property	123
Real estate held for sale | $	$ 10,613
Trails at Signal Mountain | Chattanooga, TN
Real Estate Properties [Line Items]
Units | Property	172
Real estate held for sale | $	$ 13,487
Live Oak Trace | Baton Rouge, LA
Real Estate Properties [Line Items]
Units | Property	264
Real estate held for sale | $	$ 25,164

X

- Definition

Number of units in real estate properties held for sale.

+ References

No definition available.

+ Details

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Namespace Prefix:	irt_
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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=120400017&loc=d3e572229-122910

+ Details

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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

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- Details

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- Details

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X

- Details

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X

- Details

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