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Consolidation of Variable Interest Entities - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2017 | Jan. 31, 2017 | Aug. 31, 2016 | Dec. 31, 2013 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Oct. 31, 2016
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Total assets of VIEs |  |  |  |  | $ 16,600,000 |  | $ 19,300,000 |
Total liabilities of VIEs |  |  |  |  | 11,600,000 |  | $ 12,600,000 |
Comstock Investors VIII, L.C [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Cumulative, compounded, preferred return rate |  |  |  | 20.00% |  |  |  |
Percentage of cumulative cash on cash return |  |  |  | 20.00% |  |  |  |
Comstock Investors VIII, L.C [Member] | Class B [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Distribution to non-controlling interests |  | $ 1,900,000 |  |  |  |  |  |
Comstock Investors VIII, L.C [Member] | Class A [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Number of warrants issued |  |  |  | 15 |  |  |  |
Aggregate fair value of warrants for investors |  |  |  | $ 131,000 |  |  |  |
Comstock Investors VIII, L.C [Member] | Subsidiaries [Member] | Private Placement [Member] | Class B [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Initial aggregate principal amount up to capital raise |  |  |  | $ 4,000,000 |  |  |  |
Comstock Investors X, L.C. [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Cumulative, compounded, preferred return rate |  |  | 6.00% |  |  |  |  |
Aggregate capital raise | $ 19,500,000 |  |  |  |  |  |  |
Additional capital raised | $ 5,000,000 |  |  |  |  |  |  |
Warrants issued | 50,000 |  |  |  |  |  |  |
Aggregate fair value | $ 81,000 |  |  |  |  |  |  |
Preferred distribution |  |  |  |  | $ 0 | $ 0 |  |
Comstock Investors X, L.C. [Member] | Class A [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Number of warrants issued |  |  | 150,000 |  |  |  |  |
Aggregate fair value of warrants for investors |  |  | $ 258,000 |  |  |  |  |
Comstock Investors X, L.C. [Member] | Private Placement [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Aggregate capital raise |  |  | 14,500,000 |  |  |  |  | $ 14,500,000
Comstock Investors X, L.C. [Member] | Subsidiaries [Member] | Private Placement [Member] | Class B [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Initial aggregate principal amount up to capital raise |  |  | $ 5,000,000 |  |  |  |  |
Comstock Development Services LC [Member] | Private Placement [Member] |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Aggregate capital raise |  |  |  |  |  |  |  | $ 9,500,000

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