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Schedule of Principal Payments (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
2021 | $ 39,087 |
2022 | 292,981 |
2023 | 758,110 |
2024 | 194,937 |
2025 | 14,556 |
Thereafter | 509,846 |
Total debt | $ 1,809,517 | $ 1,986,865

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