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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2019
Provision for income tax | $ 265,000 | $ 280,000 | $ 749,000 | $ 767,000 |
Percentage of rental income excluded from accounting standard adoption |  |  | 94.00% |  |
Percentage of total revenue subject to revenue recognition standard |  |  | 6.00% |  |
Right-of-use assets | 481,044,000 |  | $ 481,044,000 |  | $ 434,201,000
Lease liabilities | $ 333,312,000 |  | 333,312,000 |  | $ 278,287,000
Federal [Member] |  |  |  |  |
Provision for income tax |  |  | $ 0 |  |

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