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EQUITY METHOD INVESTMENTS IN REAL ESTATE VENTURES CARRIED AT FAIR VALUE - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]        
Fair value of investment   $ 6,307,000 $ 8,421,000  
Distributions from equity method investments carried at fair value   103,000 0  
Change in fair value   (193,000) (560,000)  
Payments to acquire equity method investments   0 1,200,000  
Level 3        
Schedule of Equity Method Investments [Line Items]        
Fair value of investment   6,307,000 8,421,000 $ 0
Distributions from equity method investments carried at fair value   1,921,000 1,525,000  
Change in fair value   (193,000) (560,000)  
Investor's X        
Schedule of Equity Method Investments [Line Items]        
Fair value of investment   5,100,000 7,200,000  
Distributions from equity method investments carried at fair value   1,800,000 1,500,000  
Change in fair value   (300,000) $ (600,000)  
The Hartford        
Schedule of Equity Method Investments [Line Items]        
Fair value of investment   1,200,000    
Distributions from equity method investments carried at fair value   $ 100,000    
Ownership percentage 2.50%      
Payments to acquire equity method investments $ 1,200,000