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Investments in Real Estate - Additional Information (Detail)	1 Months Ended	9 Months Ended
	Oct. 31, 2018 USD ($) Property	Sep. 30, 2018 USD ($) Property	Dec. 31, 2017 USD ($)
Real Estate Properties [Line Items]
Number of multifamily properties owned		58
Number of units located with multifamily properties		15,860
Real estate properties held for sale | $		$ 141,853,000	$ 0
Number of units in real estate properties acquired		1,843
Purchase Price | $		$ 195,448,000
Subsequent Event | McDonough, GA | Waterford Landing
Real Estate Properties [Line Items]
Number of units in real estate properties acquired	260
Purchase Price | $	$ 30,500,000
Held-for-sale
Real Estate Properties [Line Items]
Number of multifamily properties owned		5
Number of units located with multifamily properties		1,348
Real estate properties held for sale | $		$ 141,853,000	$ 0

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- Definition

The number of units in a real estate property acquired.

+ References

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- Definition

Payments to acquire real estate including transaction fees.

+ References

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- Definition

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

+ References

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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

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

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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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