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Earnings Per Share - Schedule of Net Income Per Share (Detail) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]    
Net income $ 87,131,169 $ 47,488,413
Weighted-average shares outstanding:    
Basic 27,696,790 23,787,485
Effect of dilutive restricted stock 95,912 131,820
Effect of dilutive contingently issuable shares   31,653
Diluted 27,792,702 23,950,958
Net income per Class A and Class B common share - basic $ 3.15 $ 2.00
Net income per Class A and Class B common share - diluted $ 3.14 $ 1.98