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Organization - Additional Information (Detail)	Dec. 31, 2018 Property
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of multifamily properties owned	58
Number of units located with multifamily properties	15,880

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

Name:	us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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