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 ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Real Estate Held for Sale      
Real Estate Properties [Line Items]      
Operating revenue $ 1,007 $ 416 $ 0
Operating expense 1,004 471 0
Other income, net (334) (142) 0
(Expense) income from real estate and related assets sold (331) (197) 0
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)