Annual report pursuant to Section 13 and 15(d)

Real Estate Dispositions, Held for Sale, and Impairment Charges - Components of Income from Real Estate and Related Assets Held for Sale (Detail)

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Real Estate Dispositions, Held for Sale, and Impairment Charges - Components of Income from Real Estate and Related Assets Held for Sale (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Real Estate Properties [Line Items]      
Impairment charge $ 1,813,000 $ 0 $ 6,835,000
Real Estate Held for Sale      
Real Estate Properties [Line Items]      
Operating revenue 600,000 1,167,000 1,156,000
Operating expense 2,220,000 307,000 291,000
Other income, net 323,000 (36,000) (240,000)
Income (expense) from real estate and related assets sold $ (1,297,000) $ 824,000 $ 625,000