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Investments in Real Estate - Additional Iniformation (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Property
Real Estate Properties Base Purchase Price [Abstract]
Number of multifamily properties owned	56
Number of units located with multifamily properties	15,280
Acquisition costs related to property | $	$ 241

X

- Definition

Real estate properties base purchase price.

+ References

No definition available.

+ Details

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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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X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
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X

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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