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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, 2016
USD ($)
Debt Disclosure [Abstract]  
2017 $ 2,161
2018 1,471
2019 1,471
2020 1,471
2021 1,471
Thereafter 6,983
Total $ 15,028