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Business Acquisition and Unaudited Pro Forma Information (Detail) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Aug. 31, 2011
Sep. 30, 2012
Diamond Bar [Member]
Sep. 30, 2011
Diamond Bar [Member]
Dec. 31, 2011
Diamond Bar [Member]
Sep. 30, 2012
Diamond Bar [Member]
Sep. 30, 2011
Diamond Bar [Member]
Business Acquisition, Cost of Acquired Entity, Purchase Price         $ 450,000   $ 450,000     $ 450,000    
Net Income (Loss) Attributable to Parent 1,243,893 1,681,589 3,647,515 3,266,657 5,365,165 4,203,009   5,870,045   589,656 12,451,742  
Revenue, Net $ 19,204,877 $ 11,187,474 $ 46,351,192 $ 26,079,694 $ 43,162,026 $ 28,818,982     $ 892,302 $ 6,217,196   $ 1,230,494