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Investments in Real Estate - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2017 USD ($) Property	Dec. 31, 2016 USD ($)
Real Estate Properties Base Purchase Price [Abstract]
Number of multifamily properties owned | Property	46
Number of units located with multifamily properties | Property	12,812
Real estate held for sale | $	$ 21,964,000	$ 60,786,000
Purchase price allocation adjustments | $	$ 0

X

- Definition

Purchase price allocation adjustments.

+ References

No definition available.

+ Details

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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_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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
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://www.xbrl.org/2003/role/presentationRef
-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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