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Summary of Disposition of Property's (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 22, 2015
Dec. 31, 2017
Dec. 31, 2016
Real Estate Properties [Line Items]      
Sale Price $ 33,600 $ 86,800 $ 88,000
Gain (loss) on sale   18,910 [1] 31,785
Net income allocable to common shares   $ 2,363 2,305
Copper Mill      
Real Estate Properties [Line Items]      
Date of Sale   May 05, 2017  
Sale Price   $ 32,000  
Gain (loss) on sale [1]   15,595  
Net income allocable to common shares   $ 548 1,105
Heritage Trace      
Real Estate Properties [Line Items]      
Date of Sale   Jun. 01, 2017  
Sale Price   $ 11,600  
Gain (loss) on sale [1]   (1,256)  
Net income allocable to common shares   $ 240 (47)
Berkshire Square      
Real Estate Properties [Line Items]      
Date of Sale   Jun. 09, 2017  
Sale Price   $ 16,000  
Gain (loss) on sale [1]   1,510  
Net income allocable to common shares   $ 201 306
Crossings      
Real Estate Properties [Line Items]      
Date of Sale   Nov. 28, 2017  
Sale Price   $ 27,200  
Gain (loss) on sale [1]   3,061  
Net income allocable to common shares   $ 1,374 $ 941
Cumberland Glen      
Real Estate Properties [Line Items]      
Date of Sale [2]     Feb. 18, 2016
Sale Price [2]     $ 18,000
Gain (loss) on sale [2]     $ 2,452
Belle Creek      
Real Estate Properties [Line Items]      
Date of Sale     Apr. 07, 2016
Sale Price     $ 23,000
Gain (loss) on sale     $ 14,191
Tresa      
Real Estate Properties [Line Items]      
Date of Sale     May 05, 2016
Sale Price     $ 47,000
Gain (loss) on sale     $ 15,142
[1] The gain (loss) on sale for these properties is net of $4,251 of defeasance and debt prepayment premium costs. All properties were previously classified as held for sale.
[2] Gain (loss) on sale related to this property includes a defeasance premium of $1,343.