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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 Additional Information (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 Additional Information (Detail)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
May 16, 2016
USD ($)
Jun. 30, 2016
USD ($)
property
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
property
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Real Estate Properties [Line Items]            
Impairment charge   $ 187 $ 0 $ 230 $ 0  
Dayton Ohio [Member]            
Real Estate Properties [Line Items]            
Impairment charge $ 40 $ 200       $ 600
Number of real estate properties, held for sale | property   4   4