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Real Estate and Intangible Assets - Summary of Estimated Aggregate Amortization Expense and Estimated Net Impact on Rental Income (Detail) - USD ($) $ in Thousands | 12 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017
Real Estate [Abstract] |  |
Estimated Amortization Expense, 2019 | $ 959 |
Estimated Amortization Expense, 2020 | 754 |
Estimated Amortization Expense, 2021 | 549 |
Estimated Amortization Expense, 2022 | 341 |
Estimated Amortization Expense, 2023 | 299 |
Estimated Amortization Expense, Thereafter | 2,784 |
Estimated Amortization Expense | 5,686 | $ 5,492
Estimated Net Increase in Rental Revenue, 2019 | 113 |
Estimated Net Increase in Rental Revenue, 2020 | 27 |
Estimated Net Increase in Rental Revenue, 2021 | 32 |
Estimated Net Increase in Rental Revenue, 2022 | 33 |
Estimated Net Increase in Rental Revenue, 2023 | 30 |
Estimated Net Increase in Rental Revenue, Thereafter | 372 |
Estimated Net Increase to Rental Income | $ 607 |

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