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Nature of Business and Financial Statement Presentation - Non-cash Investing and Financing Activities (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Other Significant Noncash Transactions [Line Items]          
Mortgages assumed from acquisitions     $ 33,700 $ 50,800  
Issuance of Operating Partnership Units ("OP Units") in connection with an acquisition     0 18,300  
Mezzanine loan applied to purchase price of acquired properties     0 20,600  
Elimination of a previously held equity interest     1,400 0  
Reclassification adjustment of foreign currency translation $ 0 $ 19,715 0 19,715  
Accounts payable related to construction in progress     46,300 30,600  
Dividends declared 67,884 61,300 67,884 61,300 $ 61,468
Write-off of preferred share original issuance costs $ 0 $ 1,943 0 1,943  
Accumulated Other Comprehensive Loss          
Other Significant Noncash Transactions [Line Items]          
Reclassification adjustment of foreign currency translation     $ 0 $ 19,700