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Interim Financial Data - Summary of Interim Financial Data (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of interim financial data                      
Net premiums earned $ 189,420,787 $ 189,821,058 $ 188,763,313 $ 188,073,242 $ 186,150,478 $ 187,661,705 $ 185,714,110 $ 181,764,580 $ 756,078,400 $ 741,290,873 $ 702,514,755
Total revenues 200,938,743 198,009,900 198,788,954 214,713,874 186,805,834 199,904,180 195,790,028 189,328,278 812,451,471 771,828,320 739,026,537
Net losses and loss expenses 121,026,333 130,743,395 131,507,280 123,110,656 143,395,401 140,726,106 135,753,645 156,583,268 506,387,664 576,458,420 487,268,054
Net (loss) income $ 14,153,747 $ 5,186,379 $ 4,788,454 $ 23,023,164 $ (14,998,763) $ 1,206,356 $ (789,855) $ (18,178,078) $ 47,151,744 $ (32,760,340) $ 7,116,100
Class A Common Stock [Member]                      
Net (loss) earnings per common share:                      
Earnings per share, Basic $ 0.50 $ 0.19 $ 0.17 $ 0.82 $ (0.53) $ 0.04 $ (0.03) $ (0.66) $ 1.68 $ (1.18) $ 0.27
Earnings per share, Diluted         (0.53) 0.04 (0.03) (0.66) 1.67 (1.18) 0.26
Class B Common Stock [Member]                      
Net (loss) earnings per common share:                      
Earnings per share, Basic                 1.51 (1.09) 0.22
Earnings per share, Diluted 0.50 0.18 0.17 0.82         1.51 (1.09) 0.22
Common stock - basic and diluted $ 0.45 $ 0.16 $ 0.15 $ 0.75 $ (0.50) $ 0.04 $ (0.03) $ (0.60) $ 1.51 $ (1.09) $ 0.22