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Unconsolidated Joint Venture - Summarized Unaudited Financial Information for Unconsolidated Joint Venture (Detail) - Title Insurance Joint Venture [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement of Operations:
Total net revenue	$ 219	$ 290
Total expenses	114	117
Net income	105	173
Comstock Holding Companies, Inc. share of net income	$ 53	$ 87

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The amount of the cost of sales reported by an equity method investment of the entity.

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The amount of net income (loss) reported by an equity method investment of the entity.

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The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

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