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Long-term debt - Principal Payments (Detail)
$ in Thousands
Dec. 31, 2020
USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]  
2021 $ 334,352
2022 422,609
2023 111,427
2024 240,151
2025 45,451
Thereafter 3,380,045
Total, including adjustment $ 4,534,035