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Subsequent Events - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands | Apr. 16, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Subsequent Event [Line Items] |  |  |
Outstanding borrowings and accrued interest, net of discounts |  | $ 15,346 | $ 14,893
Comstock Growth Fund [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Outstanding borrowings and accrued interest, net of discounts |  | $ 11,700 |
Comstock Growth Fund [Member] | Subsequent Events [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt instrument, maturity date | Apr. 16, 2019 |  |
Debt instrument, optional maturity extension term | 12 months |  |
Debt instrument, maturity extension fee percentage | 0.50% |  |
Debt instrument, interest rate | 3.89% |  |
Comstock Growth Fund [Member] | Subsequent Events [Member] | Class A [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Issuance of Class A Common Stock | 300 |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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