Annual report pursuant to Section 13 and 15(d)

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

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Schedule III - Real Estate and Accumulated Depreciation - Schedule of Change in Balance of Real Estate (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance, beginning of period $ 228,417,837 $ 148,371,478 $ 78,478,053
Additions:      
Acquisitions during the period 100,356,160 75,078,078 67,287,231
Improvements 8,772,590 5,036,926 2,726,734
Deductions:      
Dispositions during period (169,993) (68,645) (120,540)
Purchase price adjustments 0 0 0
Balance, end of period $ 337,376,594 $ 228,417,837 $ 148,371,478