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Unconsolidated Joint Venture - Summarized Financial Information for Unconsolidated Joint Venture (Detail) - Title Insurance Joint Venture [Member] - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Statement of Operations: |  |
Total net revenue | $ 58 | $ 66
Total expenses | 30 | 30
Net income | 28 | 36
Comstock Holding Companies, Inc. share of net income | $ 14 | $ 18

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