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EQUITY METHOD INVESTMENTS IN REAL ESTATE VENTURES CARRIED AT FAIR VALUE - Schedule of Combined Financial Information for Unconsolidated Real Estate Ventures (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]    
Net income $ 2,082 $ 893
Comstock Holding Companies, Inc. share of net income (96) (50)
Investor's X    
Schedule of Equity Method Investments [Line Items]    
Total revenue 14,515 6,832
Direct costs 12,982 8,196
Net income 1,533 (1,364)
The Hartford    
Schedule of Equity Method Investments [Line Items]    
Total revenue 9,308  
Direct costs 2,785  
Other costs 8,860  
Net income (2,337)  
Investor's X    
Schedule of Equity Method Investments [Line Items]    
Comstock Holding Companies, Inc. share of net income 0 $ 0
The Hartford    
Schedule of Equity Method Investments [Line Items]    
Comstock Holding Companies, Inc. share of net income $ (58)