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Investments in Real Estate - Additional Information (Detail) $ in Thousands	1 Months Ended		3 Months Ended
	Oct. 29, 2020 USD ($) Property	Feb. 29, 2020 USD ($) Property	Dec. 31, 2020 Property	Sep. 30, 2020 USD ($) Property
Real Estate Properties [Line Items]
Number of multifamily properties owned				58
Number of units located with multifamily properties				15,805
McKinney, TX
Real Estate Properties [Line Items]
Units		251
Contract Price | $		$ 51,204
Chattanooga, TN | Subsequent Event
Real Estate Properties [Line Items]
Number of units in real estate properties disposed	172
Sale price | $	$ 20,000
Held-for-Sale
Real Estate Properties [Line Items]
Number of multifamily properties owned				3
Held-for-Sale | Baton Rouge, LA
Real Estate Properties [Line Items]
Number of units located with multifamily properties				264
Impairment charge | $				$ 1,840
Forecast | Held-for-Sale
Real Estate Properties [Line Items]
Number of real estate properties expected to be sold			3

X

- Definition

Number of real estate properties expected to be sold.

+ References

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- Definition

The number of units in a real estate property acquired.

+ References

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- Definition

The number of units in a real estate property disposed.

+ References

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- Definition

Payments to acquire real estate including transaction fees.

+ References

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- Definition

Sale price of real estate property.

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- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230

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- Definition

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

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- Definition

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

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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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