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Reconciliation of Basic and Diluted Earnings per Share (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share Disclosure [Line Items]        
Net income for common shares $ 1,224,122 $ 3,695,001 $ 3,246,687 $ 8,257,968
Interest expense on convertible notes 264,125 [1] 327,401 [1] 502,487 [1] 694,001 [1]
Net income for diluted shares $ 1,488,247 $ 4,022,402 $ 3,749,174 $ 8,951,969
Weighted average shares outstanding - basic 46,474,350 42,199,576 46,474,350 40,707,568
Effect of dilutive securities:        
Convertible notes 3,810,000 11,470,975 3,810,000 12,444,486
Options granted 1,094,741 1,760,488 1,000,895 1,912,122
Warrants granted   16,384   20,440
Weighted average shares outstanding - diluted 51,379,091 55,447,423 51,285,245 55,084,616
Earnings (loss) per share - basic $ 0.03 $ 0.09 $ 0.07 $ 0.20
Earnings (loss) per share - diluted $ 0.03 $ 0.07 $ 0.07 $ 0.16
[1] Interest expense on convertible notes was added back to net income for the computation of diluted EPS.