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Quarterly Results for 2022 and 2021 (Unaudited) - Summary of Quarterly Results for the Periods Presented (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]                      
Premiums earned, net $ 291,870 $ 290,631 $ 277,061 $ 269,064 $ 271,332 $ 264,654 $ 256,172 $ 243,305 $ 1,128,626 $ 1,035,463 $ 923,563
Net investment income 10,448 6,074 5,221 4,042 3,894 2,797 2,858 2,986 25,785 12,535 20,393
Total revenues 330,360 312,810 292,006 287,482 292,659 287,254 279,181 262,757 1,222,658 1,121,851 1,072,770
Total expenses 295,881 404,417 279,595 263,403 356,566 260,761 249,087 226,386 1,243,296 1,092,800 1,048,444
Net income (loss) $ 25,111 $ (72,275) $ 7,370 $ 17,537 $ (48,125) $ 20,183 $ 21,941 $ 26,408 $ (22,257) $ 20,407 $ 19,105
Basic earnings (loss) per share (in USD per share) $ 0.83 $ (2.36) $ 0.24 $ 0.56 $ (1.54) $ 0.65 $ 0.70 $ 0.85 $ (0.72) $ 0.65 $ 0.60
Diluted earnings (loss) per share (in USD per share) $ 0.82 $ (2.36) $ 0.24 $ 0.56 $ (1.54) $ 0.64 $ 0.70 $ 0.84 $ (0.72) $ 0.65 $ 0.60