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 (Parenthetical) (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 (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Real Estate Properties [Line Items]    
Impairment charge $ 43  
Dayton Ohio [Member]    
Real Estate Properties [Line Items]    
Impairment charge $ 40 $ 600