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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, 2016 | Dec. 31, 2015
--- | --- | ---
Balloon Payments |  |  |
2017 |  | $ 0 |
2018 |  | 90,865 |
2019 | [1] | 60,793 |
2020 |  | 61,163 |
2021 |  | 11,011 |
Thereafter |  | 452,142 |
Balloon Payments |  | 675,974 |
Scheduled Principal Amortization |  |  |
2017 |  | 26,418 |
2018 |  | 26,394 |
2019 |  | 25,037 |
2020 |  | 22,331 |
2021 |  | 21,859 |
Thereafter |  | 109,761 |
Scheduled Principal Amortization |  | 231,800 |
Total |  |  |
2017 |  | 26,418 |
2018 |  | 117,259 |
2019 |  | 85,830 |
2020 |  | 83,494 |
2021 |  | 32,870 |
Thereafter |  | 561,903 |
Principal amount |  | 907,774 | $ 875,200
Unamortized deferred debt costs |  | 7,485 | $ 8,700
Net |  | $ 900,289 |
[1] | Includes $49.0 million outstanding under the line of credit.

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