Reinsurance - Additional Information (Detail) $ in Thousands	3 Months Ended
Mar. 31, 2026 USD ($) Reinsurance	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($) Reinsurance
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsurance recoverable	$ 269,852		$ 289,896
Funds withheld for assumed business	5,299		$ 5,254
Assumed premiums written	$ (1,312)	$ 20,790
Participating Reinsurers [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Number of reinsurers \| Reinsurance	48		48
Reinsurance Recoverable Including Reinsurance Premium Paid [Member] \| Reinsurer Concentration Risk [Member] \| Reinsurance [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Percentage of reinsurance recoverable major reinsurers	67.80%

Number of reinsurers participating in the company's reinsurance program.

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Amount of written premiums assumed from other entities.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of the reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder.

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Amount, after valuation allowance, recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, policy benefits and policy reserves. Excludes premiums paid under reinsurance contracts.

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