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Income Taxes - Reconciliation of Statutory Federal Income Tax Benefit (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Statutory federal income tax expense $ 1,536,869 $ (340,744) $ 2,553,376 $ 877,590
Effect of non-taxable REIT income (2,243,368) (309,902) (2,909,779) (1,763,096)
State income tax benefit 192,994 (71,524) 359,658 (8,200)
Income tax benefit $ (513,505) $ (722,170) $ 3,255 $ (893,706)