Annual report pursuant to Section 13 and 15(d)

Schedule III - Real Estate and Accumulated Depreciation - Schedule of Change in Balance of Accumulated Depreciation (Detail)

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Schedule III - Real Estate and Accumulated Depreciation - Schedule of Change in Balance of Accumulated Depreciation (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Balance, beginning of period $ 6,634,412 $ 4,431,290 $ 3,166,870
Additions during period 4,445,756 2,203,122 1,264,420
Dispositions during period (14,195) 0 0
Balance, end of period $ 11,065,973 $ 6,634,412 $ 4,431,290