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Investments - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2024
USD ($)
Security
Dec. 31, 2023
USD ($)
Marketable Securities [Line Items]    
Short-term investments   $ 0
Individual fixed maturity held in unrealized loss position | Security 187  
Individual fixed maturity held in unrealized loss position longer than 12 months | Security 40  
Number of fixed maturity securities, allowance for credit loss | Security 416  
Fixed maturity securities, held-to-maturity, allowance for credit losses $ 116,000 182,000
Fixed maturity securities, available-for-sale, allowance for credit losses 0 0
Held-to-Maturity Securities [Member]    
Marketable Securities [Line Items]    
Investments on deposit with regulatory agencies 22,600,000  
Available-for-Sale Securities [Member]    
Marketable Securities [Line Items]    
Investments on deposit with regulatory agencies 2,100,000  
Corporate Bonds [Member]    
Marketable Securities [Line Items]    
Short-term investments 9,300,000  
Fixed maturity securities, held-to-maturity, allowance for credit losses $ 86,000 142,000
Number of majority securities | Security 15  
States and Political Subdivisions [Member]    
Marketable Securities [Line Items]    
Fixed maturity securities, held-to-maturity, allowance for credit losses $ 30,000 $ 38,000
Number of majority securities | Security 398  
Corporate Fixed Income Securities [Member] | Maximum [Member]    
Marketable Securities [Line Items]    
Investments maturity period using default rate 20 years