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)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
property
Jun. 30, 2017
USD ($)
property
Mar. 31, 2017
USD ($)
property
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
property
Sep. 30, 2016
USD ($)
property
Dec. 31, 2016
property
Real Estate Properties [Line Items]              
Number of properties sold         4    
Number of real estate properties, held for sale 0       0    
Impairment charge | $ $ 0 $ 300   $ 1,786 $ 3,999 $ 2,016  
Number of impaired assets, held and used 0 0 2   0    
Impairment of asset held and used | $     $ 3,700        
Number of impaired assets sold, held and used   1          
Gain (loss) on sale of real estate, net | $ $ 1     $ (24) $ 3,993 (24)  
Impairment charge for assets held for sale | $           2,000  
Number of impaired properties reclassified to held and used 1       1    
Hazelwood, Missouri and Franklin, New Jersey              
Real Estate Properties [Line Items]              
Number of real estate properties, held for sale             2
Disposed of by sale              
Real Estate Properties [Line Items]              
Number of properties sold         4    
Impairment charge | $         $ 3,999 $ 700  
Gain (loss) on sale of real estate, net | $         $ 3,993    
Disposed of by sale | Hazelwood, Missouri and Franklin, New Jersey              
Real Estate Properties [Line Items]              
Number of properties sold         2    
Disposed of by sale | Undisclosed location              
Real Estate Properties [Line Items]              
Gain (loss) on sale of real estate, net | $ $ 1            
Held for sale              
Real Estate Properties [Line Items]              
Gain (loss) on sale of real estate, net | $   $ (1,800)          
Number of impaired assets sold, held for sale 4       4    
Number of impaired assets           5