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Income Per Share and Per Unit - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator        
Net income (loss) attributable to the Company for basic computation $ 3,872,394 $ (214,902) $ 5,878,836 $ 2,734,789
Denominator        
Weighted average number of common shares outstanding for basic computation 14,247,671 10,353,988 11,884,110 10,311,595
Basic and diluted net income (loss) per share $ 0.27 $ (0.02) $ 0.49 $ 0.27