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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Real Estate Properties [Line Items]                      
Operating expense $ 13,733 $ 15,172 $ 13,433 $ 13,257 $ 12,970 $ 13,643 $ 12,595 $ 11,757 $ 55,595 $ 50,965 $ 57,406
Real Estate Asset Disposal [Member]                      
Real Estate Properties [Line Items]                      
Operating revenue                 647 1,045 1,272
Operating expense                 469 1,071 564
Other income (expense)                 47 (353) (406)
Income (loss) from real estate and related assets sold                 $ 225 $ (379) $ 302