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
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
Impairment of real estate                 4,000    
Gain (loss) on sale of real estate, net   $ 1 $ (1,800)           3,993 242 1,538
Real Estate Asset Disposal                      
Real Estate Properties [Line Items]                      
Operating revenue                 1,280 2,569 2,958
Operating expense                 4,449 1,883 1,192
Other income (expense), net                 3,831 (403) (922)
Income from real estate and related assets sold                 $ 662 $ 283 $ 844