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Investment in Real Estate - Net Non-Cash Impairment Charges (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Real Estate [Abstract]      
Sold Operating Properties - Discontinued Operations   $ 2,652us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf $ 1,438us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
Operating Properties - Continuing Operations   0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse (192)us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Total Net Impairment $ 0us-gaap_ImpairmentOfRealEstate $ 2,652us-gaap_ImpairmentOfRealEstate $ 1,246us-gaap_ImpairmentOfRealEstate