Real Estate Acquisitions and Dispositions - Schedule of Real Estate Asset Acquisitions and Dispositions (Details)	9 Months Ended
	Sep. 30, 2021 a ApartmentUnit
Jackson, MS [Member] | Multifamily [Member] | Crosswinds [Member]
Acquisitionsand Disposals [Line Items]
Number of Units in Real Estate Property	360
Acquisition Date	2021-06
Jackson, MS [Member] | Multifamily [Member] | Pear Orchard [Member]
Acquisitionsand Disposals [Line Items]
Number of Units in Real Estate Property	389
Acquisition Date	2021-06
Jackson, MS [Member] | Multifamily [Member] | Reflection Pointe [Member]
Acquisitionsand Disposals [Line Items]
Number of Units in Real Estate Property	296
Acquisition Date	2021-06
Jackson, MS [Member] | Multifamily [Member] | Lakeshore Landing [Member]
Acquisitionsand Disposals [Line Items]
Number of Units in Real Estate Property	196
Acquisition Date	2021-06
Huntsville, AL [Member] | Land | Colonial Promenade [Member]
Acquisitionsand Disposals [Line Items]
Area of Land | a	1
Disposal Date	2021-09
Birmingham, AL [Member] | Land | Tutwiler [Member]
Acquisitionsand Disposals [Line Items]
Area of Land | a	9
Disposal Date	2021-09
Novel Daybreak [Member] | Salt Lake City, UT [Member] | Multifamily [Member]
Acquisitionsand Disposals [Line Items]
Number of Units in Real Estate Property	400
Acquisition Date	2021-04
Novel West Midtown [Member] | Atlanta, GA [Member] | Multifamily [Member]
Acquisitionsand Disposals [Line Items]
Number of Units in Real Estate Property	340
Acquisition Date	2021-04
M A A Westshore | Tampa F L | Land
Acquisitionsand Disposals [Line Items]
Area of Land | a	19
Disposal Date	2021-06