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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Reinsurance Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Direct premiums written |  |  |  |  |  |  |  |  | $ 1,845,786 | $ 1,671,252 | $ 1,517,479
Ceded premiums written |  |  |  |  |  |  |  |  | (672,508) | (586,425) | (512,576)
Net premiums written |  |  |  |  |  |  |  |  | 1,173,278 | 1,084,827 | 1,004,903
Direct premiums earned |  |  |  |  |  |  |  |  | 1,759,701 | 1,596,618 | 1,395,623
Ceded premiums earned |  |  |  |  |  |  |  |  | (631,075) | (561,155) | (472,060)
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
Direct Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | 1,972,541 | 1,189,444 | 1,080,058
Ceded Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | (1,034,142) | (410,239) | (321,248)
Net Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | $ 938,399 | $ 779,205 | $ 758,810

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