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Earnings Per Share - Earnings Per Share, Basic and Diluted (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator        
Net income (loss) attributable to the Company for basic computation $ 1,310,592 $ (1,653,654) $ (1,284,325) $ (3,948,008)
Effect of the issuance of dilutive shares on the net loss attributable to the noncontrolling interest 40,725 (22,379) (24,208) (39,627)
Net income (loss) attributable to the Company for dilutive computation $ 1,351,317 $ (1,676,033) $ (1,308,533) $ (3,987,635)
Denominator        
Weighted average number of common shares outstanding for basic computation 10,156,927 9,999,786 10,118,862 9,991,445
Dilutive effect of warrants 975,615 623,856 911,582 451,354
Weighted average number common shares outstanding for dilutive computation 11,132,542 10,623,642 11,030,444 10,442,799
Basic net income (loss) per share $ 0.13 $ (0.17) $ (0.13) $ (0.40)
Diluted net income (loss) per share $ 0.12 $ (0.16) $ (0.12) $ (0.38)