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 6 Months Ended
Jun. 30, 2017
USD ($)
property
Mar. 31, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
property
Jun. 30, 2016
USD ($)
Real Estate Properties [Line Items]          
Number of properties sold | property       3  
Number of real estate properties, held for sale | property 1     1  
Impairment charge $ 253   $ 187 $ 3,999 $ 230
Number of impaired assets | property 2     2  
Impairment of asset held and used   $ 3,700      
Number of impaired assets sold | property 1     1  
Loss on sale of properties $ 1,914   $ 0 $ (3,992) 0
Impairment charge for assets held for sale         $ 200
Held for sale          
Real Estate Properties [Line Items]          
Impairment charge 300     2,700  
Loss on sale of properties $ 1,800     $ 1,800  
Number of impaired assets | property       3