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Computation 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
Numerator
Net income	$ 5,688,674	$ 10,023,255	$ 8,975,781	$ 24,388,254
Denominator
Basic: Weighted-average common shares outstanding during the period	34,560,743	34,729,179	34,560,743	34,732,527
Add: Dilutive effect of stock options		4,009	651	395,746
Diluted	34,560,743	34,733,188	34,561,394	35,128,273
Net income per share
Basic	$ 0.16	$ 0.29	$ 0.26	$ 0.70
DILUTED	$ 0.16	$ 0.29	$ 0.26	$ 0.69

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