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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reinsurance Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Direct premiums written |  |  |  |  |  |  |  |  | $ 1,671,252 | $ 1,517,479 | $ 1,292,721
Ceded premiums written |  |  |  |  |  |  |  |  | (586,425) | (512,576) | (423,076)
Net premiums written |  |  |  |  |  |  |  |  | 1,084,827 | 1,004,903 | 869,645
Direct premiums earned |  |  |  |  |  |  |  |  | 1,596,618 | 1,395,623 | 1,233,121
Ceded premiums earned |  |  |  |  |  |  |  |  | (561,155) | (472,060) | (390,619)
Premiums earned, net | $ 271,332 | $ 264,654 | $ 256,172 | $ 243,305 | $ 242,173 | $ 234,191 | $ 226,370 | $ 220,829 | 1,035,463 | 923,563 | 842,502
Direct Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | 1,189,444 | 1,080,058 | 1,084,604
Ceded Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | (410,239) | (321,248) | (481,198)
Net Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  | $ 779,205 | $ 758,810 | $ 603,406

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