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Long-term Debt - Estimate of Principal Payments to be Made for the Amount Due on the Surplus Note (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Debt Disclosure [Abstract]  
2019 $ 1,471
2020 1,471
2021 1,471
2022 1,471
2023 1,471
Thereafter 4,042
Total $ 11,397