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Summary of Disposition of Property's (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Real Estate Properties [Line Items]    
Sale Price   $ 88,000
Gain (loss) on sale   31,783
Net income (loss) allocable to common shares $ 117 $ 638
Cumberland Glen    
Real Estate Properties [Line Items]    
Date of Sale   Feb. 18, 2016
Sale Price   $ 18,000
Gain (loss) on sale   2,454
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   14,190
Net income (loss) allocable to common shares 1 $ 250
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 $ 116 $ 353