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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 9 Months Ended
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
property
Sep. 30, 2016
USD ($)
Real Estate Properties [Line Items]          
Operating expense $ 15,867   $ 15,172 $ 47,928 $ 41,861
Impairment charge 0 $ 300 1,786 3,999 2,016
Gain (loss) on sale of real estate, net 1   (24) $ 3,993 (24)
Number of properties sold | property       4  
Assets disposed of by sale          
Real Estate Properties [Line Items]          
Operating revenue 0   642 $ 1,280 1,932
Operating expense 31   962 4,446 1,626
Other (expense) income, net 1   (183) 3,831 (253)
Income (loss) from real estate and related assets sold $ (30)   $ (503) 665 53
Rental income       $ 600  
Number of properties sold | property       1  
Impairment charge       $ 3,999 $ 700
Gain (loss) on sale of real estate, net       $ 3,993  
Number of properties sold | property       4