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Investments in Real Estate - Additional Information (Detail)	Dec. 31, 2018 USD ($) Property	Dec. 31, 2017 USD ($)
Real Estate Properties [Line Items]
Number of multifamily properties owned | Property	58
Real estate properties held for sale | $	$ 77,285,000
Held-for-sale
Real Estate Properties [Line Items]
Number of multifamily properties owned | Property	3
Real estate properties held for sale | $	$ 77,285,000	$ 0

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- 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

+ Details

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Balance Type:	debit
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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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- Details

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