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
Mar. 31, 2018
USD ($)
property
Mar. 31, 2017
USD ($)
property
Dec. 31, 2017
property
Real Estate Properties [Line Items]      
Number of properties sold 2    
Number of real estate properties, held for sale 1    
Number of impaired assets, held and used 0    
Impairment charge | $ $ 0 $ 3,746,000  
Number of impaired assets sold, held for sale     2
Arlington, Texas and Tewksbury, Massachusetts      
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 2    
Held for sale      
Real Estate Properties [Line Items]      
Number of impaired assets   2