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, 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 Held for Sale [Member]                      
Real Estate Properties [Line Items]                      
Operating revenue                 1,214 1,227 1,205
Operating expense                 974 348 327
Other expense                 (397) (547) (555)
Income (loss) from real estate and related assets sold                 $ (157) $ 332 $ 323