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Long-term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Carrying Value $ 106,250 $ 106,985
Less: unamortized debt issuance costs (3,089) (3,309)
Total long-term debt, net 103,161 103,676
Surplus note    
Debt Instrument [Line Items]    
Carrying Value 6,250 6,985
5.625% Senior unsecured notes    
Debt Instrument [Line Items]    
Carrying Value $ 100,000 $ 100,000