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Mortgage Notes Payable, Revolving Credit Facility, and Term Loan Facility - Schedule of Principal Payments of Mortgage Notes Payable (Detail) - Mortgage notes payable - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Debt Instrument [Line Items] |  |
2019 | $ 59,821 |
2020 | 32,256 |
2021 | 37,188 |
2022 | 97,718 |
2023 | 69,629 |
Thereafter | 149,098 |
Long-term debt, gross | 445,710 |
Premiums and discounts, net | (301) | $ (281)
Deferred financing costs, net | $ 4,063 | $ 4,830

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