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Balances with Related Parties (Parenthetical) (Detail) (USD $)
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Related Party Transaction [Line Items]        
Trade account receivable, allowance $ 876,300 $ 3,200,434 $ 4,022,664 $ 4,128,829
Related Party
       
Related Party Transaction [Line Items]        
Trade account receivable, allowance   $ 206,974