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Property management agreements initial term.

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Related party transaction fee payable in installments.

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Related party transaction percentage of all costs associated with portfolio projects in development.

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Related party transaction percentage of construction management fee.

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Related party transaction percentage of portfolio revenues.

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Related party transaction percentage of raised capital.

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Related party transaction percentage of sales price of asset on disposition.

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Related Party Transaction, Termination Period

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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Percentage of principal amount of debt redeemed.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Carrying amount as of the balance sheet date of obligations due all related parties.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The percentage rate used to calculate dividend payments on preferred stock.

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Related Party Transactions - Additional Information (Detail)					3 Months Ended		9 Months Ended
	Apr. 10, 2020	Mar. 19, 2020 USD ($)	Dec. 30, 2019 USD ($)	Apr. 30, 2019 USD ($) Installment $ / ft²	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Mar. 27, 2020 USD ($)	Feb. 07, 2020	Jan. 02, 2018 USD ($)
WSJ Prime Rate \| Revolving Capital Line of Credit Agreement
Related Party Transaction [Line Items]
Debt instrument spread variable rate		1.00%
Comstock Partners, L.C.
Related Party Transaction [Line Items]
Acquisition fee received			$ 500,000
Affiliated Entity
Related Party Transaction [Line Items]
Future minimum lease payments					$ 52,000		$ 52,000
Affiliated Entity \| Comstock Asset Management, L.C.
Related Party Transaction [Line Items]
Total rental payments made under lease agreement					$ 155,000	$ 153,000	$ 459,000	$ 452,000
Fixed annual payment											$ 1,000,000
Affiliated Entity \| Hartford Investment
Related Party Transaction [Line Items]
Initial investment related to the purchase			$ 1,200,000
Percentage of ownership interest										2.50%
Affiliated Entity \| DWC Operating Agreement
Related Party Transaction [Line Items]
Percentage of membership interest owned by company and partners										100.00%
Affiliated Entity \| Comstock Growth Fund
Related Party Transaction [Line Items]
Loan annual principal repayment (in percentage)	10.00%
Affiliated Entity \| Revolving Capital Line of Credit Agreement \| CDS
Related Party Transaction [Line Items]
Debt instrument term (in years)		5 years
Debt instrument maturity date from initial date		12 months
Affiliated Entity \| Revolving Capital Line of Credit Agreement \| Secured Financing \| CDS
Related Party Transaction [Line Items]
Capital line of credit		$ 10,000,000.0
Capital line of credit drawn									$ 5,500,000
Affiliated Entity \| WSJ Prime Rate \| Revolving Capital Line of Credit Agreement \| CDS
Related Party Transaction [Line Items]
Debt instrument spread variable rate		1.00%
Affiliated Entity \| Residential Property Management Agreements \| CDS
Related Party Transaction [Line Items]
Property management agreements initial term							1 year
Property management agreements renewal term							1 year
Affiliated Entity \| Construction Management Agreement \| Minimum \| CDS
Related Party Transaction [Line Items]
Percentage of construction management fee							1.00%
Affiliated Entity \| Construction Management Agreement \| Maximum \| CDS
Related Party Transaction [Line Items]
Percentage of construction management fee							4.00%
Affiliated Entity \| 2019 Amended Asset Management Agreement \| Comstock Asset Management, L.C.
Related Party Transaction [Line Items]
Cumulative, compounded, preferred return rate				8.00%
Lease fee for new leases (in dollars per sqft) \| $ / ft²				1.00
Lease fee for renewal leases (in dollars per sqft) \| $ / ft²				0.50
Affiliated Entity \| 2019 Amended Asset Management Agreement \| CDS
Related Party Transaction [Line Items]
Fixed annual payment				$ 1,000,000
Agreement additional extension term (in years)				1 year
Agreement notice period required for non-renewal				180 days
Agreement termination period				24 months
Agreement notice period required for termination				180 days
Affiliated Entity \| 2019 Amended Asset Management Agreement \| Asset Management Fee \| CDS
Related Party Transaction [Line Items]
Percentage of CRE portfolio revenues				2.50%
Affiliated Entity \| 2019 Amended Asset Management Agreement \| Construction Management Fee \| CDS
Related Party Transaction [Line Items]
Percentage of all costs associated with portfolio projects in development				4.00%
Affiliated Entity \| 2019 Amended Asset Management Agreement \| Property Management Fee \| CDS
Related Party Transaction [Line Items]
Percentage of CRE portfolio revenues				1.00%
Affiliated Entity \| 2019 Amended Asset Management Agreement \| Acquisition Fee \| CDS
Related Party Transaction [Line Items]
Maximum percentage of purchase price of an acquired asset				0.50%
Affiliated Entity \| 2019 Amended Asset Management Agreement \| Disposition Fee \| CDS
Related Party Transaction [Line Items]
Percentage sales price of an asset on disposition				0.50%
Affiliated Entity \| 2019 Amended Asset Management Agreement \| Incentive Fee \| Comstock Asset Management, L.C.
Related Party Transaction [Line Items]
Percentage of free cash flow from real estate assets				10.00%
Affiliated Entity \| 2019 Amended Asset Management Agreement \| Investment Origination Fee \| Comstock Asset Management, L.C.
Related Party Transaction [Line Items]
Percentage of raised capital				1.00%
Affiliated Entity \| Business Management Agreement \| Comstock Investors X
Related Party Transaction [Line Items]
Aggregate fee payable				$ 937,500
Number of installments of fee payment \| Installment				15
Fee payable in installments				$ 62,500