Quarterly report pursuant to Section 13 or 15(d)

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 6 Months Ended 12 Months Ended
May 16, 2016
USD ($)
Jun. 30, 2016
USD ($)
property
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
property
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Real Estate Properties [Line Items]            
Impairment loss   $ 187,000 $ 0 $ 230,000 $ 0  
Other impairment loss   $ 0 $ 0 $ 0 $ 0  
Dayton Ohio [Member]            
Real Estate Properties [Line Items]            
Property held for sale $ 200,000          
Gain or loss on sale 0          
Number of real estate properties, held for sale | property   4   4    
Impairment loss $ 40,000 $ 200,000       $ 600,000
Rock Falls Illinois [Member]            
Real Estate Properties [Line Items]            
Number of real estate properties, held for sale | property   1   1    
Angola, Indiana [Member]            
Real Estate Properties [Line Items]            
Number of real estate properties, held for sale | property   2   2    
Montgomery, AL [Member]            
Real Estate Properties [Line Items]            
Number of real estate properties, held for sale | property   1   1