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Investments - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Issue
issuer
Sep. 30, 2021
USD ($)
Issue
issuer
Dec. 31, 2020
Issue
issuer
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity, portfolio issues | Issue 1,981 1,981 1,900
Fixed portfolio, number of issuers | issuer 813 813 777
Capital called from investment funds $ 56,000    
Investment funds, unfunded commitments 357,000 $ 357,000  
Unfunded loan commitment      
Debt Securities, Available-for-sale [Line Items]      
Carrying value, net of valuation allowance 34,000 34,000  
Investment funds      
Debt Securities, Available-for-sale [Line Items]      
Investment funds, unfunded commitments $ 357,013 $ 357,013  
Investment funds | Minimum      
Debt Securities, Available-for-sale [Line Items]      
Investment funds ownership percentage   1.00%  
Investment funds | Maximum      
Debt Securities, Available-for-sale [Line Items]      
Investment funds ownership percentage   20.00%