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Nature of Business and Financial Statement Presentation - Non-cash Investing and Financing Activities (Detail) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Other Significant Noncash Transactions [Line Items] |  |  |
Dividends declared, but not paid | $ 5,133 | $ 44,600 | $ 44,036
Accounts payable related to construction in progress | 4,900 | 14,300 |
Building [Member] |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |
Assumption of buildings due to ground lease terminations | $ 3,000 | $ 0 |

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