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UNCONSOLIDATED JOINT VENTURE - Summarized Financial Information for Unconsolidated Joint Venture (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]    
Income before income tax expense $ 2,300 $ 2,026
Comstock Holding Companies, Inc. share of net income (96) (50)
Title Insurance Joint Venture    
Schedule of Equity Method Investments [Line Items]    
Comstock Holding Companies, Inc. share of net income 33 222
Title Insurance Joint Venture    
Schedule of Equity Method Investments [Line Items]    
Total net revenue 185 558
Total expenses 119 115
Income before income tax expense $ 66 $ 443