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, 2013
Dec. 31, 2012
Dec. 31, 2011
Real Estate And Accumulated Depreciation Disclosure [Abstract]      
Balance, beginning of period $ 2,535,084 $ 2,122,817 $ 1,790,776
Additions during period 631,786 412,267 332,041
Dispositions during period         
Balance, end of period $ 3,166,870 $ 2,535,084 $ 2,122,817