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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