Organization - Additional Information (Detail)	Jun. 30, 2021 Property
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of multifamily properties owned	58
Number of units located with multifamily properties	16,261

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

No definition available.

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