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Investments in Real Estate - Summary of Disposition of Property's (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Real Estate Properties [Line Items]      
Sale Price $ 59,730 $ 154,500 $ 77,300
Gain (impairment loss) on sale $ 7,843 $ 35,197 [1] $ 10,564 [2]
Aventine Greenville      
Real Estate Properties [Line Items]      
Date of Sale     Dec. 20, 2018
Sale Price     $ 52,500
Gain (impairment loss) on sale [2]     $ 6,119
Arbors At The Reservoir      
Real Estate Properties [Line Items]      
Date of Sale     Dec. 27, 2018
Sale Price     $ 24,800
Gain (impairment loss) on sale [2]     $ 4,445
Trails At Signal Mountain      
Real Estate Properties [Line Items]      
Date of Sale Oct. 27, 2020    
Sale Price $ 20,000    
Gain (impairment loss) on sale $ 6,237    
Live Oak Trace      
Real Estate Properties [Line Items]      
Date of Sale [3] Nov. 10, 2020    
Sale Price [3] $ 25,400    
Gain (impairment loss) on sale [3] $ (1,931)    
Lakeshore on the Hill      
Real Estate Properties [Line Items]      
Date of Sale Nov. 23, 2020    
Sale Price $ 14,330    
Gain (impairment loss) on sale $ 3,537    
Reserve At Eagle Ridge [Member]      
Real Estate Properties [Line Items]      
Date of Sale   Apr. 30, 2019  
Sale Price   $ 42,000  
Gain (impairment loss) on sale [1]   $ 12,294  
Little Rock, AR Portfolio [Member]      
Real Estate Properties [Line Items]      
Date of Sale   Jul. 18, 2019  
Sale Price   $ 56,500  
Gain (impairment loss) on sale [1]   $ 2,220  
Iron Rock [Member]      
Real Estate Properties [Line Items]      
Date of Sale   Dec. 17, 2019  
Sale Price   $ 56,000  
Gain (impairment loss) on sale [1]   $ 20,683  
[1] The gain for these properties is net of $7,417 of defeasance and debt prepayment costs
[2] The gain for these properties is net of $911 of debt prepayment costs.
[3]

Includes a $1,840 impairment charge recorded in the three months ended September 30, 2020.