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Schedule III - Change in Total Real Estate Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Change in total real estate assets      
Balance, beginning of period $ 507,845 $ 3,516   
Acquisitions and building improvements 3,423,903 504,329 3,516
Dispositions (8,124)      
Balance, end of period $ 3,923,624 $ 507,845 $ 3,516