Annual report pursuant to Section 13 and 15(d)

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

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Real Estate Dispositions, Held for Sale, and Impairment Charges - Components of Operating Income from Real Estate and Related Assets Disposed (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Real Estate Properties [Line Items]      
Gain (loss) on sale of real estate, net $ 2,763 $ 3,993 $ 242
Assets disposed of by sale      
Real Estate Properties [Line Items]      
Operating revenue 383 1,160 1,403
Operating expense 311 3,705 1,849
Other income, net 2,763 0 (158)
(Expense) income from real estate and related assets sold 2,835 (2,545) (604)
Gain (loss) on sale of real estate, net $ 2,763    
Impairment of real estate   $ 2,800 $ 1,100