Schedule of Activity in Real Estate Facilities (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Real estate facilities
Real estate facilities, beginning balance	$ 20,857,880	$ 0
Facility acquisitions	132,546,249	20,857,000
Finalized purchase price allocations related to 2014 acquisitions	958,000
Improvements and additions	2,156,384	880
Asset disposals	(273,963)
Real estate facilities, ending balance	156,244,550	20,857,880
Accumulated depreciation
Accumulated depreciation, beginning balance	(93,433)	0
Depreciation expense	(3,936,239)	(93,433)
Asset disposals	273,963
Accumulated depreciation, ending balance	$ (3,755,709)	$ (93,433)