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Net Reserves for Asbestos and Environmental Losses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Insurance [Abstract]      
Net reserve for A&E losses and loss adjustment expenses - beginning of period $ 21,107 $ 21,647 $ 21,985
Plus: Change in incurred losses and loss adjustment expenses 2 (1) 1,962
Less: Payments 413 539 2,300
Net reserves for A&E losses and loss adjustment expenses - end of period $ 20,696 $ 21,107 $ 21,647