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Tax Expense Benefit (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes [Line Items]      
Current Tax $ 9,455,994 $ 9,436,752  
Deferred Tax (476,345) (1,657,344)  
Total $ 8,979,649 $ 7,779,408 $ 4,790,089