Business and Organization - Additional Information (Detail) $ in Millions						12 Months Ended
	Dec. 09, 2015 shares	Nov. 20, 2014 USD ($)	Sep. 15, 2014 shares	May. 22, 2013 USD ($) shares	May. 13, 2013 shares	Dec. 31, 2015	Dec. 31, 2014 item
Business and Organization
Common stock, shares issued | shares	3,450,000		5,750,000
Net proceeds from Initial Public Offering | $				$ 192.2
Ownership interest percentage in properties						100.00%
IPO
Business and Organization
Common stock, shares issued | shares					16,525,000
Underwriters Exercise of Overallotment Option
Business and Organization
Common stock, shares issued | shares				2,478,750
Operating Partnership
Business and Organization
Operating partnership payment of outstanding indebtedness | $				$ 150.0
Consideration paid to prior investors | $		$ 1.3		$ 47.6
Options to acquire developable lands, number of parcels of developable land to be acquired | item							9
Interest acquired (as a percent)							100.00%
Lightfoot Marketplace
Business and Organization
Ownership interest percentage in properties						60.00%
Increase in ownership interest due to certain events						70.00%
Johns Hopkins Village
Business and Organization
Ownership interest percentage in properties						80.00%
Noncontrolling interest ownership percentage in properties						20.00%
Period for exchange of ownership interest after project completion						1 year
Brooks Crossing
Business and Organization
Ownership interest percentage in properties						65.00%
Liberty Apartments | Operating Partnership
Business and Organization
Business acquisition date							Jan. 17, 2014