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Fair Value Disclosures - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018
Washington D.C. [Member] |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Impairment charges | $ 0 | $ 0 | $ 600,000
Comstock Growth Fund One And Two [Member] | Series C- Non Convertible Preferred Stock [Member] |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Convertible preferred shares issued upon conversion | 2,220,690 | 2,220,690 |
Preferred stock liquidation value per share | $ 5.00 | $ 5.00 |

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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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