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Summary of Acquisitions (Parenthetical) (Detail) $ in Thousands		3 Months Ended
	Sep. 03, 2017 USD ($) Property	Mar. 31, 2018 USD ($) Property
Business Acquisition [Line Items]
Number of units in real estate properties acquired | Property		1,263
Purchase Price | $		$ 131,248
Acquisition of Nine-Property Portfolio First Phase Acquisition
Business Acquisition [Line Items]
Number of units in real estate properties acquired | Property	2,352
Purchase Price | $	$ 228,144

X

- Definition

The number of units in a real estate property acquired.

+ References

No definition available.

+ Details

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X

- Definition

Payments to acquire real estate including transaction fees.

+ References

No definition available.

+ Details

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Namespace Prefix:	irt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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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