Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Reserves For Losses And Loss Adjustment Expenses [Line Items]
Claims and claim adjustment expenses prior period development	$ 0	$ 3,867
Total incurred, net of reinsurance	79,922	$ 60,565
Citizens [Member]
Reserves For Losses And Loss Adjustment Expenses [Line Items]
Total incurred, net of reinsurance	$ 21,678