Non-controlling Interest - Operating Partnership - Additional Information (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Noncontrolling Interest
Non-controlling interest related to the outstanding of OP Units	1,425,000	1,425,000
Non-controlling interest in Operating Partnership	1.30%	1.30%
Non-controlling Interest
Noncontrolling Interest
Distribution payable	$ 598,500	$ 598,500