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RELATED PARTY TRANSACTIONS - Additional Information (Detail)						12 Months Ended
	Apr. 10, 2020	Mar. 19, 2020 USD ($)	Dec. 30, 2019 USD ($)	Apr. 30, 2019 USD ($) installment $ / ft²	Jan. 01, 2019	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Nov. 01, 2020 USD ($)	Mar. 27, 2020 USD ($)	Feb. 07, 2020	Mar. 30, 2018 USD ($)
Related Party Transaction [Line Items]
Future minimum lease payment						$ 9,795,000
Revolving Capital Line of Credit Agreement \| WSJ Prime Rate
Related Party Transaction [Line Items]
Debt instrument spread variable rate		1.00%
Maximum
Related Party Transaction [Line Items]
Operating lease term of contract						12 months
Comstock Partners L C
Related Party Transaction [Line Items]
Acquisition fee received			$ 500,000
Comstock Asset Management, L.C.
Related Party Transaction [Line Items]
Total rental payments made under lease agreement						$ 500,000	$ 600,000
Rent expense						$ 600,000	$ 600,000
Fixed annual payment											$ 1,000,000.0
Comstock Asset Management, L.C. \| 2019 Amended Asset Management Agreement
Related Party Transaction [Line Items]
Cumulative, compounded, preferred return rate				8.00%
Leasing fee per square foot for new leases \| $ / ft²				1.00
Leasing fee per square foot for renewal leases \| $ / ft²				0.50
Comstock Asset Management, L.C. \| 2019 Amended Asset Management Agreement \| Incentive Fee
Related Party Transaction [Line Items]
Percentage of free cash flow from real estate assets				10.00%
Comstock Asset Management, L.C. \| 2019 Amended Asset Management Agreement \| Investment Origination Fee
Related Party Transaction [Line Items]
Percentage of raised capital				1.00%
CDS \| Revolving Capital Line of Credit Agreement \| Secured Financing
Related Party Transaction [Line Items]
Maximum borrowing capacity		$ 10,000,000.0
Debt instrument, term		5 years
Debt instrument maturity date from initial date		12 months
Capital line of credit drawn									$ 5,500,000
CDS \| Residential Property Management Agreements
Related Party Transaction [Line Items]
Property management agreements initial term						1 year
Property management agreements renewal term						1 year
CDS \| Construction Management Agreement \| Minimum
Related Party Transaction [Line Items]
Percentage of construction management fee					1.00%
CDS \| Construction Management Agreement \| Maximum
Related Party Transaction [Line Items]
Percentage of construction management fee					4.00%
CDS \| 2019 Amended Asset Management Agreement
Related Party Transaction [Line Items]
Fixed annual payment				$ 1,000,000.0
Agreement additional extension term				1 year
Agreement notice period required for non-renewal				180 days
CDS \| 2019 Amended Asset Management Agreement \| Asset Management Fee
Related Party Transaction [Line Items]
Percentage of CRE portfolio revenues				2.50%
CDS \| 2019 Amended Asset Management Agreement \| Construction Management Fee
Related Party Transaction [Line Items]
Percentage of all costs associated with portfolio projects in development				4.00%
CDS \| 2019 Amended Asset Management Agreement \| Property Management Fee
Related Party Transaction [Line Items]
Percentage of CRE portfolio revenues				1.00%
CDS \| 2019 Amended Asset Management Agreement \| Acquisition Fee
Related Party Transaction [Line Items]
Maximum percentage of purchase price of an acquired asset				0.50%
CDS \| 2019 Amended Asset Management Agreement \| Disposition Fee
Related Party Transaction [Line Items]
Percentage sales price of an asset on disposition				0.50%
Comstock Investors X \| Business Management Agreement
Related Party Transaction [Line Items]
Aggregate fee payable				$ 937,500
Number of installments of fee payment \| installment				15
Fee payable in installments				$ 62,500
Hartford Investment
Related Party Transaction [Line Items]
Investment related to the purchase			$ 1,200,000
Affiliated Entity
Related Party Transaction [Line Items]
Operating lease term of contract								10 years
Future minimum lease payment								$ 9,800,000
Affiliated Entity \| D W C Operating Agreement
Related Party Transaction [Line Items]
Percentage of membership interest owned by company and partners										100.00%
Affiliated Entity \| Hartford Investment
Related Party Transaction [Line Items]
Ownership percentage										2.50%
Affiliated Entity \| Comstock Growth Fund
Related Party Transaction [Line Items]
Loan annual principal repayment, percentage	10.00%
Affiliated Entity \| Revolving Capital Line of Credit Agreement \| CDS
Related Party Transaction [Line Items]
Debt instrument, term		5 years
Debt instrument maturity date from initial date		12 months
Affiliated Entity \| Revolving Capital Line of Credit Agreement \| CDS \| WSJ Prime Rate
Related Party Transaction [Line Items]
Debt instrument spread variable rate		1.00%
Affiliated Entity \| Revolving Capital Line of Credit Agreement \| CDS \| Secured Financing
Related Party Transaction [Line Items]
Maximum borrowing capacity		$ 10,000,000.0
Capital line of credit drawn									$ 5,500,000