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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Real Estate Properties [Line Items]                      
Operating expense $ 12,970 $ 13,643 $ 12,595 $ 11,757 $ 10,970 $ 11,457 $ 11,243 $ 23,736 $ 50,965 $ 57,406 $ 32,823
Real Estate Held for Sale [Member]                      
Real Estate Properties [Line Items]                      
Operating revenue                 284 505 275
Operating expense                 808 295 234
Other expense                 (57) (104) (109)
Total operating revenues                 $ (581) $ 106 $ (68)