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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 ($)
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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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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-Topic 944
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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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