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Unconsolidated Joint Venture - Summarized Financial Information for Unconsolidated Joint Venture (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Statement of Operations:        
Income before income tax expense $ 470 $ 45 $ 1,740 $ 423
Comstock Holding Companies, Inc. share of net income (loss)     (114) (9)
Title Insurance Joint Venture        
Statement of Operations:        
Comstock Holding Companies, Inc. share of net income (loss) 1 48 16 115
Title Insurance Joint Venture        
Statement of Operations:        
Total net revenue 30 122 125 318
Total expenses 28 27 94 88
Income before income tax expense $ 2 $ 95 $ 31 $ 230