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Investments in Real Estate - Additional Information (Detail) $ in Thousands	1 Months Ended
	Apr. 30, 2019 USD ($) Property	Mar. 31, 2019 Property	Dec. 31, 2018 Property
Real Estate Properties [Line Items]
Number of multifamily properties owned		58
Number of units located with multifamily properties		15,880
Subsequent Event | Atlanta, GA
Real Estate Properties [Line Items]
Number of units in real estate properties acquired	224
Purchase Price | $	$ 28,000
Subsequent Event | Chicago, IL
Real Estate Properties [Line Items]
Number of units in real estate properties disposed	370
Sale Price | $	$ 42,000
Gain (loss) on sale | $	$ 12,513
Held-for-sale
Real Estate Properties [Line Items]
Number of multifamily properties owned		3	3
Number of units located with multifamily properties		832

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The number of units in a real estate property acquired.

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The number of units in a real estate property disposed.

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Payments to acquire real estate including transaction fees.

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- Definition

Sale price of real estate property.

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- Definition

The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

+ 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=109223946&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(9)(a))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(7)(c))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(14)(d))
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(a))
-URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263

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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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