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Reinsurance - Reinsurance Arrangements (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Reinsurance Disclosures [Abstract] |  |
Direct premiums written | $ 410,102 | $ 396,481
Ceded premiums written | (14,776) | (13,946)
Net premiums written | 395,326 | 382,535
Direct premiums earned | 455,368 | 414,603
Ceded premiums earned | (173,144) | (145,539)
Premiums earned, net | 282,224 | 269,064
Direct losses and loss adjustment expenses | 208,222 | 195,155
Ceded losses and loss adjustment expenses | (2,068) | (10,049)
Net Losses and Loss Adjustment Expenses | $ 206,154 | $ 185,106

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