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, 2013
Dec. 31, 2012
Dec. 31, 2011
Real Estate And Accumulated Depreciation Disclosure [Abstract]      
Balance, beginning of period $ 39,678,968 $ 32,399,715 $ 19,551,350
Additions:      
Acquisitions during the period 37,768,162 7,279,253 12,284,480
Improvements 1,030,923    563,885
Deductions:      
Dispositions during period         
Purchase price adjustments         
Balance, end of period $ 78,478,053 $ 39,678,968 $ 32,399,715