Quarterly report pursuant to Section 13 or 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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Real Estate Properties [Line Items]        
Operating expense $ 15,172 $ 13,643 $ 41,861 $ 37,995
Real Estate Dispositions [Member]        
Real Estate Properties [Line Items]        
Operating revenue 50 132 271 538
Operating expense 4 702 193 872
Other expense (10) (41) (69) (155)
Income (loss) from real estate and related assets sold 36 (611) 9 (489)
Real Estate Held for Sale [Member]        
Real Estate Properties [Line Items]        
Operating revenue 362 357 1,090 1,074
Operating expense 1,918 151 2,426 484
Other expense (108) (138) (338) (412)
Income (loss) from real estate and related assets sold $ (1,664) $ 68 $ (1,674) $ 178