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Nature of Business and Financial Statement Presentation - Non-cash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Other Significant Noncash Transactions [Line Items]
Accounts payable related to construction in progress	$ 11,400	$ 15,800
Receivable and reduction of real estate assets, net related to hurricane casualty	59,700	0
Dividends declared	78,419	75,200	$ 75,245
Building [Member]
Other Significant Noncash Transactions [Line Items]
Assumption of buildings due to lease termination	$ 8,600	$ 0

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Future cash outflow to pay for construction in progress expenditures that have occurred.

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