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Related Party Transactions - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 22, 2017
Dec. 29, 2015
May 12, 2015
Oct. 17, 2014
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 18, 2014
Related Party Transaction [Line Items]                
Future minimum lease payments         $ 100,000      
Outstanding borrowings         15,346,000   $ 14,893,000  
Gains on extinguishment of Series B preferred stock and issuance of Series C preferred stock $ 1,011              
Revenue-asset management         2,791,000 $ 0    
Comstock Asset Management, L.C. [Member]                
Related Party Transaction [Line Items]                
Total payments made under lease agreement         53,000 $ 52,000    
Trade receivable         6,000,000      
Fixed annual payment         1,000,000      
Aggregate deposit         2,500,000      
Receipt of payments         800,000      
Revenue-asset management         2,800,000      
Comstock Development Services [Member]                
Related Party Transaction [Line Items]                
Credit facility outstanding       $ 10,000,000        
Other Purchasers [Member]                
Related Party Transaction [Line Items]                
Credit facility outstanding       6,200,000        
Comstock Growth Fund [Member]                
Related Party Transaction [Line Items]                
Outstanding borrowings         $ 11,700,000      
Stonehenge [Member]                
Related Party Transaction [Line Items]                
Original principal amount   $ 4,500,000            
Principal amount outstanding plus all accrued but unpaid interest   $ 3,900,000            
Series B Preferred Stock [Member]                
Related Party Transaction [Line Items]                
Paid-in-kind dividends on preferred stock, number of shares         0 15,663    
Paid-in-kind dividends on preferred stock, liquidation value           $ 78,000    
Shares exchanged pursuant to agreement, converted 772,210              
Series B Preferred Stock [Member] | Stonehenge [Member]                
Related Party Transaction [Line Items]                
Shares issued upon conversion of debt   772,210            
Preferred stock par value   $ 0.01            
Preferred stock redemption price   $ 5.00            
Preferred stock dividend rate, percentage   8.75%            
Series C Preferred Stock [Member]                
Related Party Transaction [Line Items]                
Preferred stock par value         $ 0.01   $ 0.01  
Shares exchanged pursuant to agreement, issued 772,210              
Par value per share $ 0.01              
Stated value per share $ 5.00              
Class A [Member] | Comstock Growth Fund [Member] | Private Placement [Member]                
Related Party Transaction [Line Items]                
Number of shares issued     226,857          
Trade Receivables [Member] | Comstock Asset Management, L.C. [Member]                
Related Party Transaction [Line Items]                
Trade receivable         $ 0   $ 145,000  
Services and out of Pocket Expenses Incurred [Member] | Revenue - Real Estate Services [Member] | Comstock Asset Management, L.C. [Member]                
Related Party Transaction [Line Items]                
Services and out-of-pocket expenses incurred         0 $ 203,000    
Notes Payable, Other Payables [Member] | Comstock Growth Fund [Member]                
Related Party Transaction [Line Items]                
Debt instrument, initial principal amount       10,000,000        
Maximum borrowing amount       $ 20,000,000       $ 25,000,000
Additional aggregate principal loan amount         6,200,000      
Credit facility outstanding         $ 16,200,000      
Debt instrument, term       3 years        
Debt instrument, interest rate description         LIBOR      
Loan annual principal repayment, percentage       10.00%        
Notes Payable, Other Payables [Member] | Comstock Growth Fund II, L.C. [Member]                
Related Party Transaction [Line Items]                
Credit facility outstanding   $ 5,000,000            
Maximum borrowing amount   $ 10,000,000            
Debt instrument, term   2 years            
Debt instrument, floor 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      
Outstanding borrowings         $ 3,700,000   3,600,000  
Comstock Growth Fund II, L.C. [Member] | Comstock Growth Fund II, L.C. [Member]                
Related Party Transaction [Line Items]                
Credit facility outstanding   $ 5,000,000            
Debt instrument, initial principal amount   5,000,000            
Maximum borrowing amount   $ 10,000,000            
Debt instrument, term   2 years            
Debt instrument, floor 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.      
Outstanding borrowings         $ 3,700,000   $ 3,600,000  
LIBOR Rate [Member] | Notes Payable, Other Payables [Member] | Comstock Growth Fund [Member]                
Related Party Transaction [Line Items]                
Debt instrument, spread variable rate       9.75%        
Floor Rate [Member] | Notes Payable, Other Payables [Member] | Minimum [Member] | Comstock Growth Fund [Member]                
Related Party Transaction [Line Items]                
Debt instrument, floor interest rate       10.00%