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Debt - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Apr. 01, 2019
May 23, 2018
USD ($)
$ / shares
shares
Oct. 17, 2014
USD ($)
Mar. 31, 2019
USD ($)
SecurityLoan
Promissory_Notes
$ / shares
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
SecurityLoan
Promissory_Notes
$ / shares
Dec. 29, 2015
USD ($)
Dec. 18, 2014
USD ($)
Line of Credit Facility [Line Items]                
Credit facilities or project related loans scheduled to mature during the remainder of 2019       $ 4,935,000        
Outstanding secured debt       10,033,000   $ 13,432,000    
Secured - other       857,000   909,000    
Credit facility outstanding             $ 5,000,000  
Outstanding borrowings and accrued interest, net of discounts       $ 4,935,000   $ 4,903,000    
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%   10.00%    
Interest payments       $ 200,000 $ 100,000      
Unsecured Seller-financed Promissory Note [Member]                
Line of Credit Facility [Line Items]                
Interest rate for period       5.70%   6.00%    
Debt instrument maturity date       Jul. 17, 2022        
Debt instrument, gross       $ 595,000   $ 595,000    
Number of unsecured seller-financed promissory note outstanding | Promissory_Notes       1   1    
LIBOR Rate [Member] | Unsecured Seller-financed Promissory Note [Member]                
Line of Credit Facility [Line Items]                
Debt instrument spread variable rate       3.00%        
Construction Loans [Member] | Construction Revolvers [Member]                
Line of Credit Facility [Line Items]                
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%        
Outstanding secured debt       $ 1,900,000   $ 2,200,000    
Maturity range, start date       2020-03        
Maturity range, end date       2020-07        
Debt instrument, gross       $ 1,883,000   $ 2,220,000    
Development and Acquisition Notes [Member]                
Line of Credit Facility [Line Items]                
Weighted average interest rate       5.90%   6.60%    
Outstanding secured debt       $ 7,300,000   $ 10,300,000    
Maturity range, start date       2020-03        
Maturity range, end date       2021-07        
Debt instrument, gross       $ 7,293,000   10,290,000    
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%        
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]                
Debt instrument maturity date       Oct. 17, 2022        
Number of secured loan | SecurityLoan       1   1    
Secured - other       $ 824,000   $ 874,000    
Fixed interest rate       6.50%   6.50%    
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        
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          
Principal payments to CGF       $ 0 $ 0      
Notes Payable, Other Payables [Member] | Comstock Growth Fund [Member] | Subsequent Event [Member]                
Line of Credit Facility [Line Items]                
Debt instrument maturity date Apr. 16, 2020              
Credit Facilities or Project Related Loans [Member]                
Line of Credit Facility [Line Items]                
Credit facilities or project related loans scheduled to mature during the remainder of 2019       $ 0        
Membership Exchange Agreement [Member] | Notes Payable, Other Payables [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%            
Membership Exchange Agreement [Member] | Notes Payable, Other Payables [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            
Membership Exchange Agreement [Member] | Notes Payable, Other Payables [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