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
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Real Estate Properties [Line Items]                      
Operating expense $ 20,405 $ 15,867 $ 14,357 $ 17,708 $ 13,733 $ 15,172 $ 13,433 $ 13,257 $ 68,337 $ 55,595 $ 50,965
Asset impairment charges       $ 3,700         6,835 2,016 622
Real Estate Held for Sale                      
Real Estate Properties [Line Items]                      
Operating revenue                 872 1,121 1,121
Operating expense                 3,538 556 559
Other income, net                 0 (158) (232)
Income from real estate and related assets sold                 (2,666) $ 407 $ 330
Asset impairment charges                 $ 2,800