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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |  |  |
Minimum Distribution Percentage of Taxable Income to Qualify for Real Estate Investment Trust |  |  | 90.00% |  |
Income tax expense | $ 1,972,000 | $ 2,428,000 | $ 4,456,000 | $ 4,363,000 |
Liabilities for uncertain tax positions | $ 0 |  | $ 0 |  | $ 0

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