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Adjusted Carrying Value of Goodwill (Detail) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Goodwill [Line Items]    
Gross carrying amount of goodwill $ 20,016,727 $ 20,016,727
Accumulated impairment loss on goodwill (18,247,866) (16,176,866)
Net goodwill $ 1,768,861 $ 3,839,861