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Long-term Debt - Estimate of Principal Payments to be Made for the Amount Due on the Surplus Note (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
2021 $ 1,471  
2022 1,471  
2023 1,471  
2024 1,471  
2025 1,471  
Thereafter 1,101  
Total $ 8,456 $ 9,926