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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, 2023 USD ($) Claim | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 3,450,253 |  |  |  |
Accident Year 2019 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 487,459 | $ 470,372 | $ 467,198 | $ 452,029 | $ 446,419
Total of IBNR Plus Expected Development (Redundancy) on Reported Claims | $ (4,404) |  |  |  |
Cumulative Number of Reported Claims | Claim | 47,695 |  |  |  |
Accident Year 2020 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 725,486 | 635,412 | 637,764 | $ 617,795 |
Total of IBNR Plus Expected Development (Redundancy) on Reported Claims | $ (4,604) |  |  |  |
Cumulative Number of Reported Claims | Claim | 81,106 |  |  |  |
Accident Year 2021 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 695,957 | 646,977 | $ 641,679 |  |
Total of IBNR Plus Expected Development (Redundancy) on Reported Claims | $ (19,332) |  |  |  |
Cumulative Number of Reported Claims | Claim | 60,580 |  |  |  |
Accident Year 2022 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 717,840 | $ 793,341 |  |  |
Total of IBNR Plus Expected Development (Redundancy) on Reported Claims | $ (19,946) |  |  |  |
Cumulative Number of Reported Claims | Claim | 103,936 |  |  |  |
Accident Year 2023 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 823,511 |  |  |  |
Total of IBNR Plus Expected Development (Redundancy) on Reported Claims | $ 344,113 |  |  |  |
Cumulative Number of Reported Claims | Claim | 45,849 |  |  |  |

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