Real Estate Acquisitions and Dispositions - Additional Information (Details)	Mar. 31, 2019 ft² a apartmentunits
Novel Midtown [Member]
Business Acquisitions and Dispositions [Line Items]
Number of Units in Real Estate Property | apartmentunits	345
Peachtree Road - outparcel [Member]
Business Acquisitions and Dispositions [Line Items]
Area of Land | a	1
Poplar Avenue Office [Member] [Member]
Business Acquisitions and Dispositions [Line Items]
Square Footage of Real Estate Property | ft²	42,000