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Liability for Unpaid Losses and Loss Adjustment Expenses - Summary of Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Detail) $ in Thousands | Dec. 31, 2022 USD ($) Claim | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 2,894,636 |  |  |  |
Accident Year 2018 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 348,534 | $ 346,785 | $ 348,792 | $ 335,946 | $ 334,368
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (1,175) |  |  |  |
Cumulative Number of Reported Claims | Claim | 54,468 |  |  |  |
Accident Year 2019 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 470,372 | 467,198 | 452,029 | $ 446,419 |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (9,236) |  |  |  |
Cumulative Number of Reported Claims | Claim | 47,647 |  |  |  |
Accident Year 2020 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 635,412 | 637,764 | $ 617,795 |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (14,382) |  |  |  |
Cumulative Number of Reported Claims | Claim | 81,027 |  |  |  |
Accident Year 2021 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 646,977 | $ 641,679 |  |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (23,473) |  |  |  |
Cumulative Number of Reported Claims | Claim | 60,470 |  |  |  |
Accident Year 2022 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 793,341 |  |  |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ 250,623 |  |  |  |
Cumulative Number of Reported Claims | Claim | 85,543 |  |  |  |

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