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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Operations:
Comstock Holding Companies, Inc. share of net income	$ (606)	$ 0	$ (606)	$ 0
Title Insurance Joint Venture [Member]
Statement of Operations:
Total net revenue	122	87	318	246
Total expenses	27	28	88	89
Net income	95	59	230	157
Comstock Holding Companies, Inc. share of net income	$ 48	$ 30	$ 115	$ 79

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