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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 28, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Provision for income tax |  | $ 280,000 | $ 228,000 | $ 767,000 | $ 710,000
Percentage of rental income excluded from accounting standard adoption |  |  |  | 94.00% |
Percentage of total revenue subject to revenue recognition standard |  |  |  | 6.00% |
Accounting Standards Update 2016-02 [Member] | Maximum [Member] |  |  |  |  |
Expected right of use assets and related lease liabilities to opening balance sheet adoption of new accounting standard on leases |  |  |  | $ 300,000,000 |
Adjustments for New Accounting Principle, Early Adoption |  |  |  |  |
Gain (loss) on equity transaction | $ 0 |  |  |  |
Federal [Member] |  |  |  |  |
Provision for income tax |  |  |  | $ 0 |

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