Real Estate Acquisitions and Dispositions - Additional Information (Details)	Jun. 30, 2018 a
Sync36 [Member]
Business Acquisitions and Dispositions [Line Items]
Number of Units in Real Estate Property	374
Craft Farms Residential - Outparcel [Member]
Business Acquisitions and Dispositions [Line Items]
Area of Land	3
Randal Park - Outparcel [Member]
Business Acquisitions and Dispositions [Line Items]
Area of Land	34
CG at Azure - Outparcel [Member]
Business Acquisitions and Dispositions [Line Items]
Area of Land	29