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Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Scheduled Maturities of All Debt, Including Scheduled Principal Amortization (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Balloon Payments |  |
2021 | $ 11,012 |
2022 | 141,002 |
2023 | 84,225 |
2024 | 66,164 |
2025 | 20,363 |
Thereafter | 569,330 |
Balloon Payments | 892,096 |
Scheduled Principal Amortization |  |
2021 | 30,355 |
2022 | 31,017 |
2023 | 31,481 |
2024 | 30,856 |
2025 | 27,860 |
Thereafter | 116,586 |
Scheduled Principal Amortization | 268,155 |
Total |  |
2021 | 41,367 |
2022 | 172,019 |
2023 | 115,706 |
2024 | 97,020 |
2025 | 48,223 |
Thereafter | 685,916 |
Principal amount | 1,160,251 | $ 1,100,000
Unamortized deferred debt costs | 9,337 | $ 9,700
Net | $ 1,150,914 |

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