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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 ($)
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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Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Cumulative number of reported claims for short-duration insurance contracts.

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