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Summary of Disposition of Property's (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Real Estate Properties [Line Items]      
Sale Price $ 77,300 $ 86,800 $ 88,000
Gain (loss) on sale $ 10,564 [1] $ 18,910 [2] $ 31,785
Aventine Greenville      
Real Estate Properties [Line Items]      
Date of Sale Dec. 20, 2018    
Sale Price $ 52,500    
Gain (loss) on sale [1] $ 6,119    
Arbors At The Reservoir      
Real Estate Properties [Line Items]      
Date of Sale Dec. 27, 2018    
Sale Price $ 24,800    
Gain (loss) on sale [1] $ 4,445    
Copper Mill      
Real Estate Properties [Line Items]      
Date of Sale   May 05, 2017  
Sale Price   $ 32,000  
Gain (loss) on sale [2]   $ 15,595  
Heritage Trace      
Real Estate Properties [Line Items]      
Date of Sale   Jun. 01, 2017  
Sale Price   $ 11,600  
Gain (loss) on sale [2]   $ (1,256)  
Berkshire Square      
Real Estate Properties [Line Items]      
Date of Sale   Jun. 09, 2017  
Sale Price   $ 16,000  
Gain (loss) on sale [2]   $ 1,510  
Crossings      
Real Estate Properties [Line Items]      
Date of Sale   Nov. 28, 2017  
Sale Price   $ 27,200  
Gain (loss) on sale [2]   $ 3,061  
Cumberland Glen      
Real Estate Properties [Line Items]      
Date of Sale [3]     Feb. 18, 2016
Sale Price [3]     $ 18,000
Gain (loss) on sale [3]     $ 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) for these properties is net of $911 of debt prepayment premium costs.
[2] The gain (loss) on sale for these properties is net of $4,251 of defeasance and debt prepayment premium costs.
[3] Gain (loss) on sale related to this property includes a defeasance premium of $1,343.