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Summarized Activity in Liability for Unpaid Losses and Loss Adjustment Expenses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Insurance [Abstract]      
Balance at beginning of period $ 850,599 $ 832,404 $ 759,904
Less: ceded reinsurance receivables 72,829 73,021 94,443
Net balance at beginning of period 777,770 759,383 665,461
Incurred losses and loss adjustment expenses related to:      
Current year 213,118 279,609 367,298
Prior years 72 9,544 (8,070)
Total incurred losses and loss adjustment expenses 213,190 289,153 359,228
Paid losses and loss adjustment expenses related to:      
Current year 40,063 72,717 103,442
Prior years 211,260 198,049 161,864
Total paid losses and loss adjustment expenses 251,323 270,766 265,306
Net balance at end of period 739,637 777,770 759,383
Plus: ceded reinsurance receivables 60,754 72,829 73,021
Balance at end of period $ 800,391 $ 850,599 $ 832,404