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Quarterly Results for 2023 and 2022 (Unaudited) - Summary of Quarterly Results for the Periods Presented (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract]                      
Premiums earned, net $ 335,398 $ 331,040 $ 303,274 $ 282,224 $ 291,870 $ 290,631 $ 277,061 $ 269,064 $ 1,251,936 $ 1,128,626 $ 1,035,463
Net investment income 13,714 12,755 11,282 10,698 10,448 6,074 5,221 4,042 48,449 25,785 12,535
Total revenues 375,456 360,048 339,570 316,508 330,360 312,810 292,006 287,482 1,391,582 1,222,658 1,121,851
Total expenses 347,925 366,294 300,402 282,081 295,881 404,417 279,595 263,403 1,296,702 1,243,296 1,092,800
Net income (loss) $ 19,999 $ (5,915) $ 28,566 $ 24,173 $ 25,111 $ (72,275) $ 7,370 $ 17,537 $ 66,823 $ (22,257) $ 20,407
Basic earnings (loss) per share (in USD per share) $ 0.69 $ (0.20) $ 0.94 $ 0.80 $ 0.83 $ (2.36) $ 0.24 $ 0.56 $ 2.24 $ (0.72) $ 0.65
Diluted earnings (loss) per share (in USD per share) $ 0.68 $ (0.20) $ 0.93 $ 0.79 $ 0.82 $ (2.36) $ 0.24 $ 0.56 $ 2.22 $ (0.72) $ 0.65