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Summary of Disposition of Property's (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 22, 2015
Dec. 31, 2016
Real Estate Properties [Line Items]    
Sale Price $ 33,600 $ 88,000
Gain (loss) on sale   31,785
Net income (loss) allocable to common shares   $ 641
Cumberland Glen    
Real Estate Properties [Line Items]    
Date of Sale [1]   Feb. 18, 2016
Sale Price [1]   $ 18,000
Gain (loss) on sale [1]   2,452
Net income (loss) allocable to common shares [1]   $ 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   $ 252
Tresa    
Real Estate Properties [Line Items]    
Date of Sale   May 05, 2016
Sale Price   $ 47,000
Gain (loss) on sale   15,142
Net income (loss) allocable to common shares   $ 354
[1] Gain (loss) on sale related to this property includes a defeasance premium of $1,343