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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, 2021 USD ($) Claim | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
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Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 2,529,485 |  |  |  |
Accident Year 2017 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 436,059 | $ 404,673 | $ 375,123 | $ 334,734 | $ 303,944
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ 358 |  |  |  |
Cumulative Number of Reported Claims | Claim | 133,095 |  |  |  |
Accident Year 2018 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 346,785 | 348,792 | 335,946 | $ 334,368 |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (8,241) |  |  |  |
Cumulative Number of Reported Claims | Claim | 54,440 |  |  |  |
Accident Year 2019 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 467,198 | 452,029 | $ 446,419 |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (2,602) |  |  |  |
Cumulative Number of Reported Claims | Claim | 47,636 |  |  |  |
Accident Year 2020 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 637,764 | $ 617,795 |  |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ 11,850 |  |  |  |
Cumulative Number of Reported Claims | Claim | 80,604 |  |  |  |
Accident Year 2021 |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 641,679 |  |  |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ 127,765 |  |  |  |
Cumulative Number of Reported Claims | Claim | 59,383 |  |  |  |

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