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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2019 | Dec. 31, 2018
Provision for income tax | $ 246,000 | $ 274,000 | $ 484,000 | $ 487,000 |  |
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 | 431,753,000 |  | $ 431,753,000 |  | $ 434,201,000 | $ 0
Lease liabilities | $ 281,620,000 |  | 281,620,000 |  | $ 278,287,000 | $ 0
Federal [Member] |  |  |  |  |  |
Provision for income tax |  |  | $ 0 |  |  |

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