Annual report pursuant to Section 13 and 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)
12 Months Ended
Dec. 31, 2019
USD ($)
property
Dec. 31, 2018
USD ($)
property
Dec. 31, 2017
USD ($)
property
Schedule Of Real Estate Owned Held For Sale [Line Items]      
Number of impaired assets, held and used 0    
Number of real estate properties, held for sale 1 1  
Impairment charge | $ $ 1,813,000 $ 0 $ 6,835,000
Held-for-sale or Disposed of by Sale      
Schedule Of Real Estate Owned Held For Sale [Line Items]      
Number of impaired assets, sold   1 2
Held-for-sale      
Schedule Of Real Estate Owned Held For Sale [Line Items]      
Number of real estate properties, held for sale 1 1  
Number of impaired assets     3