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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, 2016	Sep. 30, 2015	Dec. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Accounts payable related to construction in progress	$ 15,800	$ 43,900
Dividends declared	75,158	68,100	$ 68,604
Mortgages assumed from acquisitions	0	33,700
Redemption of OP Units	0	18,300
Elimination of a previously held equity interest	$ 0	$ 1,400

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