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Income Per Share and Per Unit - Computation of Basic and Diluted Earnings Per Share (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Numerator    
Net income attributable to the Company for basic and dilutive computation $ 575,336us-gaap_NetIncomeLoss $ 783,002us-gaap_NetIncomeLoss
Denominator    
Weighted average number of common shares outstanding 10,595,801us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 10,225,710us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Basic and diluted net income per share $ 0.05us-gaap_EarningsPerShareBasicAndDiluted $ 0.08us-gaap_EarningsPerShareBasicAndDiluted