Quarterly report pursuant to Section 13 or 15(d)

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

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Real Estate Held for Sale and Impairment Charges - Additional Information (Detail)
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Property
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Real Estate Properties [Line Items]      
Impairment loss $ 43,000    
Other impairment loss $ 0 $ 0  
Dayton Ohio [Member]      
Real Estate Properties [Line Items]      
Number of real estate properties, held for sale | Property 1    
Property held for sale $ 200,000    
Impairment loss $ 40,000   $ 600,000
Rock Falls Illinois [Member]      
Real Estate Properties [Line Items]      
Number of real estate properties, held for sale | Property 1    
Angola, Indiana [Member]      
Real Estate Properties [Line Items]      
Number of real estate properties, held for sale | Property 2