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Quarterly Results of Operations - Summarize Unaudited Quarterly Results of Operations (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, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract]                              
Net premiums earned $ 148,614 $ 122,156 $ 115,556 $ 109,559 $ 105,918 $ 106,972 $ 124,919 $ 125,763 $ 102,224 $ 94,232 $ 93,004 $ 87,843 $ 495,885 $ 463,572 $ 377,303
Total revenues 162,670 131,644 127,327 129,029 119,943 126,654 125,926 127,040 112,320 99,217 101,504 94,874 550,670 499,563 407,915
Losses and loss adjustment expenses 65,398 66,726 61,890 60,565 72,135 139,794 86,830 72,704 63,193 62,664 55,917 45,751 254,579 371,463 227,525
Policy acquisition and other underwriting expenses 22,716 22,768 22,618 22,720 24,028 24,678 26,863 29,408 24,158 23,340 23,169 23,065 90,822 104,977 93,732
Interest expense 2,822 2,827 2,667 2,801 2,839 2,813 1,515 601 657 1,664 2,000 2,079 11,117 7,768 6,400
Total expenses 108,510 111,556 107,061 105,893 117,200 190,256 137,486 123,039 109,782 105,721 96,407 84,772 433,020 567,981 396,682
Income before income taxes 54,160 20,088 20,266 23,136 2,743 (63,602) (11,560) 4,001 2,538 (6,504) 5,097 10,102 117,650 (68,418) 11,233
Net income 40,913 15,669 14,882 17,793 2,651 (51,503) (8,542) 2,791 1,435 (4,868) 3,830 6,845 89,257 (54,603) 7,242
Comprehensive income (loss) $ 43,839 $ 16,421 $ 13,202 $ 22,756 $ 3,593 $ (58,804) $ (10,171) $ 7 $ 1,128 $ (5,129) $ 3,470 $ 6,705 $ 96,218 $ (65,375) $ 6,174
Earnings per share:                              
Basic $ 4.31 $ 1.53 $ 1.45 $ 1.78 $ 0.18 $ (5.66) $ (1.04) $ 0.09 $ 0.01 $ (0.72) $ 0.25 $ 0.82 $ 9.13 $ (6.24) $ 0.23
Diluted $ 3.4 [1] $ 1.34 [1] $ 1.28 [1] $ 1.54 [1] $ 0.18 [2] $ (5.66) [2] $ (1.04) [2] $ 0.09 [2] $ 0.01 [3] $ (0.72) [3] $ 0.24 [3] $ 0.75 [3] $ 7.62 $ (6.24) $ 0.21
[1] During the quarter ended March 31, 2023, warrants were antidilutive.
[2] During the quarter ended March 31, 2022, the convertible senior notes were antidilutive. During the quarters ended June 30, 2022, September 30, 2022 and December 31, 2022, the convertible senior notes, stock options and warrants were antidilutive
[3] During the quarters ended June 30, 2021 and December 31, 2021, the convertible senior notes were antidilutive. During the quarter ended September 30, 2021, the convertible senior notes, stock options and warrants were antidilutive.