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Summary of Disposition of Property's (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Real Estate Properties [Line Items]    
Sale Price   $ 59,600
Gain (loss) on sale [1]   15,958
Net income (loss) allocable to common shares $ (39) $ 1,728
Copper Mill    
Real Estate Properties [Line Items]    
Date of Sale   May 05, 2017
Sale Price   $ 32,000
Gain (loss) on sale [1]   15,616
Net income (loss) allocable to common shares (3) $ 794
Heritage Trace    
Real Estate Properties [Line Items]    
Date of Sale   Jun. 01, 2017
Sale Price   $ 11,600
Gain (loss) on sale [1]   (1,237)
Net income (loss) allocable to common shares (3) $ 477
Berkshire    
Real Estate Properties [Line Items]    
Date of Sale   Jun. 09, 2017
Sale Price   $ 16,000
Gain (loss) on sale [1]   1,579
Net income (loss) allocable to common shares $ (33) $ 457
[1] The gain (loss) on sale for these properties is net of $2,748 of defeasance costs. All properties were previously classified as held for sale