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Real Estate Dispositions, Held for Sale and Impairment Charges - Additional Information (Detail)

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Real Estate Dispositions, Held for Sale and Impairment Charges - Additional Information (Detail)
3 Months Ended 9 Months Ended
Aug. 24, 2016
USD ($)
property
May 16, 2016
USD ($)
Sep. 30, 2016
USD ($)
property
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
property
Sep. 30, 2015
USD ($)
Real Estate Properties [Line Items]            
Loss on sale of real estate     $ (24,000) $ 0 $ (24,000) $ 0
Number of real estate properties, held for sale | property     5   5  
Impairment loss     $ 1,786,000 $ 622,000 $ 2,016,000 622,000
Dayton Ohio [Member]            
Real Estate Properties [Line Items]            
Property held for sale   $ 200,000        
Loss on sale of real estate   0        
Impairment loss   40,000     40,000 $ 600,000
Angola, Indiana [Member]            
Real Estate Properties [Line Items]            
Number of properties sold | property 2          
Rock Falls, Illinois and Angola, Indiana [Member]            
Real Estate Properties [Line Items]            
Property held for sale $ 3,000,000          
Loss on sale of real estate $ 20,000          
Impairment loss   20,000     $ 20,000  
Montgomery, AL [Member]            
Real Estate Properties [Line Items]            
Impairment loss   200,000        
Hazelwood, MO [Member]            
Real Estate Properties [Line Items]            
Impairment loss   700,000        
South Hadley, MA [Member]            
Real Estate Properties [Line Items]            
Impairment loss   $ 1,100,000