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
Apr. 07, 2017
USD ($)
Mar. 31, 2017
USD ($)
property
Mar. 31, 2016
USD ($)
property
Real Estate Properties [Line Items]      
Number of properties sold | property   1  
Number of real estate properties, held for sale | property   1  
Loss on sale of properties | $   $ (5,906,000) $ 0
Number of impaired assets | property   2  
Impairment of assets held and used | $   $ 3,700,000  
Impairment charge for assets held for sale | $     $ 400,000
Subsequent event      
Real Estate Properties [Line Items]      
Loss on sale of properties | $ $ 100,000    
Disposed of by sale      
Real Estate Properties [Line Items]      
Number of real estate properties, held for sale | property   1  
Held for sale      
Real Estate Properties [Line Items]      
Impairment charge for assets held for sale | $   $ 0  
Number of impaired assets sold | property     1