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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, 2020 USD ($) Claim | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
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Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 2,185,444 |  |  |  |
Accident Year 2016 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 362,155 | $ 351,487 | $ 324,577 | $ 286,252 | $ 269,814
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ 628 |  |  |  |
Cumulative Number of Reported Claims | Claim | 40,568 |  |  |  |
Accident Year 2017 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 404,673 | 375,123 | 334,734 | $ 303,944 |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ 5,128 |  |  |  |
Cumulative Number of Reported Claims | Claim | 132,576 |  |  |  |
Accident Year 2018 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 348,792 | 335,946 | $ 334,368 |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (1,444) |  |  |  |
Cumulative Number of Reported Claims | Claim | 54,185 |  |  |  |
Accident Year 2019 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 452,029 | $ 446,419 |  |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (2,589) |  |  |  |
Cumulative Number of Reported Claims | Claim | 47,437 |  |  |  |
Accident Year 2020 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 617,795 |  |  |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ 102,141 |  |  |  |
Cumulative Number of Reported Claims | Claim | 76,800 |  |  |  |

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