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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ 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
Reinsurance Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Direct premiums written | $ 432,600 |  |  |  |  |  |  |  | $ 1,921,833 | $ 1,845,786 | $ 1,671,252
Ceded premiums written |  |  |  |  |  |  |  |  | (577,020) | (672,508) | (586,425)
Net premiums written |  |  |  |  |  |  |  |  | 1,344,813 | 1,173,278 | 1,084,827
Direct premiums earned |  |  |  |  |  |  |  |  | 1,875,129 | 1,759,701 | 1,596,618
Ceded premiums earned |  |  |  |  |  |  |  |  | (623,193) | (631,075) | (561,155)
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
Direct Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | 1,046,854 | 1,972,541 | 1,189,444
Ceded Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | (54,218) | (1,034,142) | (410,239)
Net Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | $ 992,636 | $ 938,399 | $ 779,205

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