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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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- Definition Future cash outflow to pay for construction in progress expenditures that have occurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 + Details
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