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Earnings Per Share - Schedule of Net Income Per Share (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 6,481,049	$ 87,131,169
Weighted-average shares outstanding:
Basic	27,444,110	27,696,790
Effect of dilutive restricted stock	89,873	95,912
Diluted	27,533,983	27,792,702
Net income per Class A and Class B common share - basic	$ 0.24	$ 3.15
Net income per Class A and Class B common share - diluted	$ 0.24	$ 3.14

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