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Changes in Total Real Estate (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Carrying amount of real estate investments [Roll Forward]      
Gross real estate, beginning balance $ 4,387,913 $ 4,228,106 $ 4,044,650
Acquisitions 23,900 122,366 133,344
Improvements 93,799 63,721 64,714
Dispositions and other (28,013) (26,280) (14,602)
Gross real estate, ending balance $ 4,477,599 $ 4,387,913 $ 4,228,106