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Summary of Significant Accounting Policies - Non-cash Investing and Financing Activities (Detail) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Other Significant Noncash Transactions [Line Items] |  |  |
Accounts payable related to construction in progress | $ 16,700 | $ 15,700 |
Receivable and reduction of real estate assets, net - related to hurricane | 7,800 | 0 |
Dividends declared | 78,690 | 76,700 | $ 78,549
Conversion of Operating Partnership Units | 900 | 0 |
Building [Member] |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |
Assumption of building due to ground lease termination | $ 2,200 | $ 0 |

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