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Significant Accounting Policies - Computation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 10,389,405	$ 7,991,721	$ 3,280,276	$ 2,889,870
Net income per common share-basic	$ 0.55	$ 0.42	$ 0.17	$ 0.16
Net income per common share-diluted	$ 0.51	$ 0.39	$ 0.16	$ 0.15
Basic weighted average common shares outstanding	19,011,960	18,807,675	18,986,746	18,020,121
Diluted weighted average common shares outstanding	20,236,946	20,238,343	20,227,600	19,472,995

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.