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Summary of Significant Accounting Policies - Non-cash Investing and Financing Activities (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Significant Noncash Transactions [Line Items] |  |  |
Accounts payable related to construction in progress | $ 13,400 | $ 13,300 | $ 31,600
Dividends declared | 78,549 | 75,245 | 68,600
Casualty insurance receivable and reduction of real estate assets, net related to hurricane casualty | 65,900 | 0 | 0
Redemption of OP Units | 0 | 0 | 18,300
Mortgages assumed from acquisitions | 0 | 0 | 33,700
Elimination of a previously held equity interest | 0 | 0 | 1,400
Building [Member] |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |
Assumption of buildings due to lease termination | $ 8,600 | $ 0 | $ 0

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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=98513485&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=98513485&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=98513485&loc=d3e4313-108586 + Details
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