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Insurance Products and Reinsurance of Certain Risks - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Non-life Insurance [Member]      
Insurance [Line Items]      
Unpaid claim reserves $ 0 $ 0  
Increase (decrease) in unpaid claim reserves 500,000 (400,000) $ 1,100,000
Unearned Premium Reserves [Member] | Life Insurance [Member]      
Insurance [Line Items]      
Restricted cash and restricted available-for-sale investments 21,200,000 18,500,000  
Unpaid Claim Reserves [Member] | Life Insurance [Member]      
Insurance [Line Items]      
Restricted cash and restricted available-for-sale investments $ 1,100,000 $ 1,300,000