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Discontinued Operations - Components of Condensed Balance Sheet Related to Assets Held for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Discontinued Operations And Disposal Groups [Abstract]    
Land $ 1,682  
Buildings 7,441  
Fixtures and tenant improvements 245  
Carrying amount of real estate assets held for sale 9,368  
Less: Accumulated depreciation (1,999)  
Total asset held for sale $ 7,369 $ 0