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Summary of Significant Accounting Policies - Non-cash Investing and Financing Activities (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Other Significant Noncash Transactions [Line Items] |  |  |
Mortgages assumed from acquisitions | $ 33,700 | $ 293,300 | $ 969,700
Issuance of Operating Partnership Units ("OP Units") | 0 | 18,300 | 0
Redemption of OP Units | 18,300 | 0 | 0
Elimination of a previously held equity interest | 1,400 | 2,500 | 26,400
Accounts payable related to construction in progress | 31,600 | 25,700 | 21,500
Dividends declared | 68,604 | 61,468 | 55,100
Preferred equity interest and mezzanine loan applied to purchase price of acquired properties | 0 | 51,775 | 160,100
Reclassification adjustment of foreign currency translation |  | 21,755 |
Write-off of preferred share original issuance costs | 0 | 1,943 | 5,246
Accumulated Other Comprehensive Loss [Member] |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |
Reclassification adjustment of foreign currency translation | $ 0 | $ 21,800 | $ 0

X
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