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Supplementary Information for Property Casualty Underwriters (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract]      
Deferred Policy Acquisition Costs $ 41,136 $ 42,445 $ 64,894
Reserves for Unpaid Claims and Claim Adjustment Expenses 800,391 850,599 832,404
Discount If Any Deducted 0 0 0
Unearned Premiums 183,411 182,852 269,353
Earned Premiums 376,992 473,357 602,471
Net Investment Income 62,375 55,444 27,627
Claims and Claim Adjustment Expense Incurred Related To Current Year 213,118 279,609 367,298
Claims and Claim Adjustment Expense Incurred Related To Prior Year 72 9,544 (8,070)
Amortization Of Deferred Policy Acquisition Costs 87,635 120,883 150,946
Paid Claims and Claim Adjustment Expenses 251,323 270,766 265,306
Premiums Written $ 379,190 $ 399,319 $ 591,331