Quarterly report pursuant to Section 13 or 15(d)

Real Estate 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 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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Real Estate Properties [Line Items]        
Operating expense $ 13,643 $ 11,457 $ 37,995 $ 46,437
Total operating revenues 21,375 19,014 61,983 54,540
Real Estate Held for Sale [Member]        
Real Estate Properties [Line Items]        
Operating revenue 505 623 1,626 1,732
Operating expense 744 234 1,034 556
Other expense 47 67 175 201
Total operating revenues $ (286) $ 322 $ 417 $ 975