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Related Party Transactions - Additional Information (Detail)					6 Months Ended
	Apr. 10, 2020	Mar. 19, 2020	Dec. 30, 2019 USD ($)	Apr. 30, 2019 USD ($) installment $ / ft²	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 27, 2020 USD ($)	Feb. 07, 2020	Jan. 02, 2018 USD ($)
Related Party Transaction [Line Items]
Trade receivables - related parties					$ 3,038,000	$ 3,568,000
Comstock Partners, L.C.
Related Party Transaction [Line Items]
Acquisition fee received			$ 500,000
Affiliated Entity
Related Party Transaction [Line Items]
Trade receivables - related parties					$ 3,000,000.0	$ 3,600,000
Affiliated Entity \| Comstock Asset Management, L.C.
Related Party Transaction [Line Items]
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 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