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, 2014
Dec. 31, 2013
Dec. 31, 2012
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]      
Balance, beginning of period $ 78,478,053us-gaap_RealEstateGrossAtCarryingValue $ 39,678,968us-gaap_RealEstateGrossAtCarryingValue $ 32,399,715us-gaap_RealEstateGrossAtCarryingValue
Additions:      
Acquisitions during the period 67,287,231us-gaap_RealEstateOtherAcquisitions 37,768,162us-gaap_RealEstateOtherAcquisitions 7,279,253us-gaap_RealEstateOtherAcquisitions
Improvements 2,726,734us-gaap_RealEstateImprovements 1,030,923us-gaap_RealEstateImprovements  
Deductions:      
Dispositions during period (120,540)us-gaap_RealEstateCostOfRealEstateSold    
Purchase price adjustments 0us-gaap_RealEstateOtherDeductions 0us-gaap_RealEstateOtherDeductions 0us-gaap_RealEstateOtherDeductions
Balance, end of period $ 148,371,478us-gaap_RealEstateGrossAtCarryingValue $ 78,478,053us-gaap_RealEstateGrossAtCarryingValue $ 39,678,968us-gaap_RealEstateGrossAtCarryingValue