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Investments - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]      
Purchase an available-for-sale debt with credit deterioration $ 0 $ 0 $ 0
Available-for-sale debt securities 0    
Other investments $ 0    
Investment [Member] | Issuer Concentration [Member] | Market Value of Total Investment Portfolio [Member]      
Schedule of Investments [Line Items]      
Investment concentration risk percentage 5.00%