Business of Organization - Schedule of Properties Under Development or Construction (Details)	Jun. 30, 2017
Multifamily | Harding Place
Business And Organization [Line Items]
Ownership interest percentage in properties	80.00%
Multifamily | 595 King Street
Business And Organization [Line Items]
Ownership interest percentage in properties	92.50%
Multifamily | 530 Meeting Street
Business And Organization [Line Items]
Ownership interest percentage in properties	90.00%
Town Center Phase VI | Mixed-use
Business And Organization [Line Items]
Ownership interest percentage in properties	100.00%