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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Reinsurance Disclosures [Abstract] |  |  |  |  |
Direct premiums written |  | $ 500,677 | $ 432,984 | $ 1,429,685 | $ 1,271,925
Ceded premiums written |  | (23,956) | (124) | (670,339) | (585,413)
Net premiums written |  | 476,721 | 432,860 | 759,346 | 686,512
Direct premiums earned |  | 452,450 | 410,621 | 1,295,858 | 1,178,801
Ceded premiums earned |  | (161,819) | (145,967) | (459,102) | (414,670)
Premiums earned, net |  | 290,631 | 264,654 | 836,756 | 764,131
Direct losses and loss adjustment expenses |  | 1,269,344 | 264,068 | 1,724,729 | 777,668
Ceded losses and loss adjustment expenses | $ (66,000) | (938,900) | (76,487) | (1,008,875) | (278,903)
Net Losses and Loss Adjustment Expenses | $ 45,000 | $ 330,444 | $ 187,581 | $ 715,854 | $ 498,765

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