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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)

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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)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
property
Mar. 31, 2017
USD ($)
Real Estate Properties [Line Items]    
Operating expense $ 17,402 $ 17,708
Gain on sale of real estate, net $ 1,844 5,906
Number of properties sold | property 2  
Assets disposed of by sale    
Real Estate Properties [Line Items]    
Operating revenue $ 93 280
Operating expense 149 142
Other income (expense), net 1,844 0
Income from real estate and related assets sold 1,788 $ 138
Gain on sale of real estate, net $ 1,844  
Number of properties sold | property 2