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Long-term debt - Principal Payments (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]  
2020 $ 602,028
2021 117,513
2022 351,227
2023 97,478
2024 215,743
Thereafter 2,547,916
Total, including adjustment $ 3,931,905