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Income Taxes - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) Assets | Dec. 31, 2015 USD ($) Assets
Income Taxes [Line Items] |  |  |  |
Percentage of distributed taxable income to qualify as a REIT | 90.00% |  |  |
Number of years the Company distributed sufficient taxable income in order to meet REIT distribution requirements | 3 years |  |  |
U.S. federal income taxes | $ 0 | $ 0 | $ 0 |
U.S. federal excise taxes | $ 0 | 0 | 0 |
Number of subsequent taxable years | 4 years |  |  |
Net payment | $ 700,000 | 1,100,000 | $ 700,000 |
Puerto Rico [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Number of properties | Assets |  |  |  | 14
Prepaid tax asset |  |  |  | $ 16,800,000
Number of properties sold | Assets |  |  | 2 |
Prepaid tax asset released |  |  | $ 1,400,000 |
Valuation allowance change in period |  | $ 4,000,000.0 | $ 10,800,000 |

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