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Computation of Basic and Diluted Net Income per Share Attributable to Ordinary Shareholders (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Computation Of Earnings Per Share Line Items      
Net income attributable to ordinary shareholders $ 22,826,454 $ 23,969,950 $ 11,422,021
Less: Amounts allocated to Series A convertible redeemable preferred shares for participating rights to dividends     (2,661,886)
Net income attributable to ordinary shareholders-basic and diluted $ 22,826,454 $ 23,969,950 $ 8,760,135
Weighted average number of ordinary shares outstanding-basic 27,751,335 27,894,953 16,665,918
Weighted average number of ordinary shares outstanding-diluted 28,073,731 28,521,272 19,030,112
Basic net income per share $ 0.82 $ 0.86 $ 0.53
Diluted net income per share $ 0.81 $ 0.84 $ 0.46
Stock Options
      
Computation Of Earnings Per Share Line Items      
Additional shares included in the calculation of diluted EPS 249,756 607,791 447,139
Restricted Stock
      
Computation Of Earnings Per Share Line Items      
Additional shares included in the calculation of diluted EPS 72,640 18,528 1,917,055