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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Reinsurance Disclosures [Abstract] |  |  |  |
Direct premiums written | $ 578,267 | $ 547,126 | $ 1,024,446 | $ 957,228
Ceded premiums written | (632,813) | (561,480) | (633,104) | (576,256)
Net premiums written | (54,546) | (14,354) | 391,342 | 380,972
Direct premiums earned | 490,649 | 463,324 | 972,721 | 918,692
Ceded premiums earned | (145,691) | (160,050) | (293,738) | (333,194)
Premiums earned, net | 344,958 | 303,274 | 678,983 | 585,498
Direct losses and loss adjustment expenses | 253,613 | 253,079 | 493,932 | 461,301
Ceded losses and loss adjustment expenses | (10,041) | (29,352) | (10,173) | (31,420)
Net Losses and Loss Adjustment Expenses | $ 243,572 | $ 223,727 | $ 483,759 | $ 429,881

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