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- Principal Payments (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]  
2019 $ 334,855
2020 308,917
2021 111,880
2022 343,737
2023 481,859
Thereafter 1,740,471
Total, including adjustment $ 3,321,719