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Organization - Additional Information (Detail)	Mar. 31, 2021 Property
Class Of Stock [Line Items]
Number of multifamily properties owned	56
Number of units located with multifamily properties	15,667
IROP
Class Of Stock [Line Items]
Ownership interest held by IRT	99.30%
Ownership interest held by third parties	0.70%

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- 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.

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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The number of real estate properties owned as of the balance sheet date.

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

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