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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, 2019 USD ($) Claim | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
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Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 1,734,939 |  |  |  |
Accident Year 2015 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | 225,964 | $ 213,860 | $ 194,600 | $ 187,431 | $ 170,381
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ 763 |  |  |  |
Cumulative Number of Reported Claims | Claim | 26,785 |  |  |  |
Accident Year 2016 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 351,487 | 324,577 | 286,252 | $ 269,814 |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (719) |  |  |  |
Cumulative Number of Reported Claims | Claim | 40,504 |  |  |  |
Accident Year 2017 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 375,123 | 334,734 | $ 303,944 |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (5,547) |  |  |  |
Cumulative Number of Reported Claims | Claim | 127,129 |  |  |  |
Accident Year 2018 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 335,946 | $ 334,368 |  |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (2,546) |  |  |  |
Cumulative Number of Reported Claims | Claim | 53,899 |  |  |  |
Accident Year 2019 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Loss and Defense & Cost Containment Expenses, Net of Reinsurance | $ 446,419 |  |  |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (67,638) |  |  |  |
Cumulative Number of Reported Claims | Claim | 46,079 |  |  |  |

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