Unconsolidated Joint Venture - Summarized Financial Information for Unconsolidated Joint Venture (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Operations:
Income (loss) before income tax expense	$ 1,234	$ (78)	$ 1,270	$ 378
Comstock Holding Companies, Inc. share of net income			(93)	(47)
Title Insurance Joint Venture
Statement of Operations:
Comstock Holding Companies, Inc. share of net income	18	10	15	68
Title Insurance Joint Venture
Statement of Operations:
Total net revenue	64	48	95	196
Total expenses	29	28	66	61
Income (loss) before income tax expense	$ 35	$ 20	$ 29	$ 135