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Debt - Additional Information (Detail)
 12 Months Ended
May 23, 2018
USD ($)
$ / shares
shares
Dec. 29, 2015
USD ($)
Oct. 17, 2014
USD ($)
Dec. 31, 2018
USD ($)
SecurityLoan
Promissory_Notes
$ / shares
Dec. 31, 2017
USD ($)
SecurityLoan
Promissory_Notes
$ / shares
Sep. 29, 2018
USD ($)
Dec. 18, 2014
USD ($)
Line of Credit Facility [Line Items]              
Outstanding secured debt       $ 13,432,000 $ 23,215,000    
Credit facility outstanding   $ 5,000,000          
Secured-other       909,000 1,069,000    
Outstanding borrowings and accrued interest, net of discounts       4,903,000 14,893,000    
Income tax expense (benefit)       $ (920,000) $ 38,000    
Series C Preferred Stock [Member]              
Line of Credit Facility [Line Items]              
Preferred stock par value per share | $ / shares       $ 0.01 $ 0.01    
Comstock Development Services [Member]              
Line of Credit Facility [Line Items]              
Credit facility outstanding     $ 10,000,000        
Other Purchasers [Member]              
Line of Credit Facility [Line Items]              
Credit facility outstanding     6,200,000        
Comstock Growth Fund [Member]              
Line of Credit Facility [Line Items]              
Interest rate       10.00% 11.90%    
Interest payments       $ 600,000 $ 1,600,000    
Note Exchange Agreement [Member] | Comstock Growth Fund II, L.C. [Member]              
Line of Credit Facility [Line Items]              
Gain loss on conversion of notes $ 3,700,000     3,700,000      
Income tax expense (benefit) (500,000)     $ (900,000)      
Unsecured Seller-financed Promissory Note [Member]              
Line of Credit Facility [Line Items]              
Interest rate for period       6.00% 4.60%    
Debt instrument maturity date       Jul. 17, 2022      
Debt instrument, gross       $ 600,000 $ 600,000    
Number of unsecured seller-financed promissory note outstanding | Promissory_Notes       1 1    
Unsecured Seller-financed Promissory Note [Member] | Commercial Paper One [Member]              
Line of Credit Facility [Line Items]              
Interest rate         9.50%    
Debt instrument, gross         $ 100,000    
LIBOR Rate [Member] | Unsecured Seller-financed Promissory Note [Member]              
Line of Credit Facility [Line Items]              
Debt instrument spread variable rate       3.00%      
Prime Rate [Member] | Unsecured Seller-financed Promissory Note [Member] | Commercial Paper One [Member]              
Line of Credit Facility [Line Items]              
Debt instrument spread variable rate       5.00%      
Construction Loans [Member] | Construction Revolvers [Member]              
Line of Credit Facility [Line Items]              
Outstanding secured debt       $ 2,200,000 $ 7,300,000    
Debt instrument, interest rate description       Interest rates charged under these facilities include the London Interbank Offered Rate (“LIBOR”) and prime rate pricing options, subject to minimum interest rate floors.      
Weighted average interest rate       5.70% 4.70%    
Maturity range, start date       Mar. 15, 2020      
Maturity range, end date       Jul. 31, 2020      
Debt instrument, gross       $ 2,220,000 $ 7,237,000    
Development and Acquisition Notes [Member]              
Line of Credit Facility [Line Items]              
Outstanding secured debt       $ 10,300,000 $ 9,500,000    
Weighted average interest rate       6.60% 7.10%    
Maturity range, start date       Mar. 15, 2019      
Maturity range, end date       Jul. 25, 2021      
Debt instrument, gross       $ 10,290,000 $ 9,533,000    
Development and Acquisition Notes [Member] | Minimum [Member] | LIBOR and Prime Rate Pricing Options [Member]              
Line of Credit Facility [Line Items]              
Interest rate floor       4.25%      
Development and Acquisition Notes [Member] | Maximum [Member] | LIBOR and Prime Rate Pricing Options [Member]              
Line of Credit Facility [Line Items]              
Interest rate floor       5.50%      
First and Second and Mezzanine Notes [Member]              
Line of Credit Facility [Line Items]              
Outstanding secured debt         1,200,000    
Credit facility outstanding         1,100,000    
Interest rate       12.00%      
Interest rate paid on a monthly basis       6.00%      
Interest rate accrued and paid on maturity       6.00%      
First and Second and Mezzanine Notes [Member] | Line of Credit [Member]              
Line of Credit Facility [Line Items]              
Outstanding secured debt         2,000,000    
Credit facility outstanding         2,000,000    
Interest rate       12.00%      
Line of Credit [Member]              
Line of Credit Facility [Line Items]              
Outstanding secured debt         $ 2,100,000    
Interest rate floor       5.00%      
Maximum borrowing capacity           $ 3,000,000  
Interest rate for period         5.00%    
Debt instrument maturity description       This line of credit was secured by the first priority security interest in the Company’s wholly owned subsidiaries in the Washington, D.C. metropolitan area and guaranteed by our Chief Executive Officer. The Company used this line of credit to finance the predevelopment related expenses and deposits for current and future projects and carried a variable interest rate tied to a one-month LIBOR plus 3.25% per annum, with an interest rate floor of 5.0%.      
Debt instrument, gross       $ 13,000 $ 2,123,000    
Line of Credit [Member] | LIBOR Rate [Member]              
Line of Credit Facility [Line Items]              
Debt instrument spread variable rate       3.25%      
Secured Line of Credit [Member]              
Line of Credit Facility [Line Items]              
Outstanding secured debt       $ 13,000      
Maximum borrowing capacity       $ 200,000      
Interest rate for period       6.75%      
Secured Line of Credit [Member] | Prime Rate [Member]              
Line of Credit Facility [Line Items]              
Debt instrument spread variable rate       2.50%      
Secured Other [Member]              
Line of Credit Facility [Line Items]              
Number of secured loan | SecurityLoan       1 1    
Fixed interest rate       6.50% 6.50%    
Debt instrument maturity date       Oct. 17, 2022      
Secured-other       $ 900,000 $ 1,100,000    
Unsecured Note [Member]              
Line of Credit Facility [Line Items]              
Debt instrument, interest rate description       LIBOR      
Interest rate         3.60%    
Debt instrument, gross         $ 600,000    
Debt instrument, term       10 years      
Unsecured Note [Member] | LIBOR Rate [Member]              
Line of Credit Facility [Line Items]              
Debt instrument spread variable rate       2.20%      
Unsecured Notes Payable To Affiliate [Member] | Comstock Growth Fund [Member]              
Line of Credit Facility [Line Items]              
Outstanding borrowings and accrued interest, net of discounts       $ 4,900,000 11,300,000    
Notes Payable, Other Payables [Member] | Comstock Growth Fund [Member]              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity     $ 20,000,000       $ 25,000,000
Debt instrument maturity date       Apr. 16, 2019      
Debt instrument, term     3 years        
Debt instrument, initial principal amount     $ 10,000,000        
Loan annual principal repayment, percentage       10.00%      
Principal payments to CGF       $ 0 1,500,000    
Notes Payable, Other Payables [Member] | Comstock Growth Fund II, L.C. [Member]              
Line of Credit Facility [Line Items]              
Credit facility outstanding   5,000,000          
Maximum borrowing capacity   $ 10,000,000          
Debt instrument, term   2 years          
Debt instrument fixed interest rate   10.00%          
Line of credit facility additional extension period   1 year          
Debt instrument, interest payment terms       Interest payments will be accrued and paid in kind monthly for the first year, and then paid current monthly in arrears beginning December 31, 2016.      
Notes Payable, Other Payables [Member] | Membership Exchange Agreement [Member] | Comstock Growth Fund [Member]              
Line of Credit Facility [Line Items]              
Credit facility outstanding $ 7,700,000            
Percentage of membership interest 91.50%            
Debt instrument reduction $ 5,700,000            
Debt instrument fixed interest rate 10.00%            
Notes Payable, Other Payables [Member] | Membership Exchange Agreement [Member] | Comstock Growth Fund [Member] | Series C- Non Convertible Preferred Stock [Member]              
Line of Credit Facility [Line Items]              
Convertible preferred shares issued upon conversion | shares 1,482,300            
Preferred stock par value per share | $ / shares $ 0.01            
Notes Payable, Other Payables [Member] | Membership Exchange Agreement [Member] | Comstock Growth Fund [Member] | Series C Preferred Stock [Member]              
Line of Credit Facility [Line Items]              
Preferred stock liquidation value per share | $ / shares $ 5.00            
Notes Payable, Other Payables [Member] | Note Exchange Agreement [Member] | Comstock Growth Fund II, L.C. [Member]              
Line of Credit Facility [Line Items]              
Credit facility outstanding $ 3,700,000       $ 3,600,000    
Notes Payable, Other Payables [Member] | Note Exchange Agreement [Member] | Comstock Growth Fund II, L.C. [Member] | Series C- Non Convertible Preferred Stock [Member]              
Line of Credit Facility [Line Items]              
Convertible preferred shares issued upon conversion | shares 738,390            
Preferred stock par value per share | $ / shares $ 0.01            
Preferred stock liquidation value per share | $ / shares $ 5.00