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Summary of Disposition of Property's (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Real Estate Properties [Line Items]    
Sale Price   $ 88,000
Gain (loss) on sale   31,782
Net income (loss) allocable to common shares $ 3 $ 641
Cumberland Glen    
Real Estate Properties [Line Items]    
Date of Sale   Feb. 18, 2016
Sale Price   $ 18,000
Gain (loss) on sale   2,452
Net income (loss) allocable to common shares   $ 35
Belle Creek    
Real Estate Properties [Line Items]    
Date of Sale   Apr. 07, 2016
Sale Price   $ 23,000
Gain (loss) on sale   14,191
Net income (loss) allocable to common shares 2 $ 252
Tresa    
Real Estate Properties [Line Items]    
Date of Sale   May 05, 2016
Sale Price   $ 47,000
Gain (loss) on sale   15,139
Net income (loss) allocable to common shares $ 1 $ 354