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Related Party Transactions - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
May 23, 2018
Mar. 22, 2017
Dec. 29, 2015
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]              
Future minimum lease payments           $ 400,000  
Lease expiration date           Sep. 30, 2019  
Revenue-asset management           $ 56,749,000 $ 45,430,000
Credit facility outstanding     $ 5,000,000        
Income tax expense (benefit)           (920,000) $ 38,000
Gains on extinguishment of Series B preferred stock and issuance of Series C preferred stock   $ 1,011,000          
Series B Preferred Stock [Member]              
Related Party Transaction [Line Items]              
Shares exchanged pursuant to agreement, converted   858,210          
Paid-in-kind dividends on preferred stock, number of shares             15,663
Paid-in-kind dividends on preferred stock, liquidation value             $ 78,000
Comstock Growth Fund II, L.C. [Member] | Notes Payable, Other Payables [Member]              
Related Party Transaction [Line Items]              
Gain loss on conversion of notes           $ 3,700,000  
Income tax expense (benefit)       $ (500,000) $ (500,000)    
Comstock Growth Fund II, L.C. [Member] | Notes Payable, Other Payables [Member] | Note Exchange Agreement [Member]              
Related Party Transaction [Line Items]              
Credit facility outstanding $ 3,700,000           $ 3,600,000
Series C Preferred Stock [Member]              
Related Party Transaction [Line Items]              
Preferred stock par value per share           $ 0.01 $ 0.01
Shares exchanged pursuant to agreement, issued   772,210          
Par value per share   $ 0.01          
Stated value per share   $ 5.00          
Paid-in-kind dividends on preferred stock, number of shares             0
Asset Management [Member]              
Related Party Transaction [Line Items]              
Revenue-asset management           $ 12,473,000 $ 0
Comstock Asset Management, L.C. [Member]              
Related Party Transaction [Line Items]              
Total rental payments made under lease agreement           400,000 200,000
Rent expense           400,000 200,000
Fixed annual payment           1,000,000  
Comstock Asset Management, L.C. [Member] | Trade Receivables [Member]              
Related Party Transaction [Line Items]              
Related parties           0 145,000
Comstock Asset Management, L.C. [Member] | Services and out of Pocket Expenses Incurred [Member] | Revenue - Real Estate Services [Member]              
Related Party Transaction [Line Items]              
Services and out-of-pocket expenses incurred           120,000 1,100,000
Comstock Asset Management, L.C. [Member] | Asset Management [Member]              
Related Party Transaction [Line Items]              
Revenue-asset management           12,000,000  
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        
Stonehenge [Member] | Series B Preferred Stock [Member]              
Related Party Transaction [Line Items]              
Shares issued upon conversion of debt     772,210        
Preferred stock par value per share     $ 0.01        
Preferred stock redemption price     $ 5.00        
Preferred stock dividend rate, percentage     8.75%        
Comstock Growth Fund II, L.C. [Member] | Note Exchange Agreement [Member]              
Related Party Transaction [Line Items]              
Gain loss on conversion of notes 3,700,000         3,700,000  
Income tax expense (benefit) (500,000)         $ (900,000)  
Comstock Growth Fund II, L.C. [Member] | Comstock Growth Fund II, L.C. [Member]              
Related Party Transaction [Line Items]              
Debt instrument, initial principal amount     $ 5,000,000        
Comstock Growth Fund II, L.C. [Member] | Notes Payable, Other Payables [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.  
Comstock Growth Fund II, L.C. [Member] | Notes Payable, Other Payables [Member] | Note Exchange Agreement [Member]              
Related Party Transaction [Line Items]              
Credit facility outstanding $ 3,700,000           $ 3,600,000
Series C- Non Convertible Preferred Stock [Member] | Comstock Growth Fund II, L.C. [Member] | Notes Payable, Other Payables [Member] | Note Exchange Agreement [Member]              
Related Party Transaction [Line Items]              
Preferred stock par value per share $ 0.01            
Convertible preferred shares issued upon conversion 738,390            
Series C Preferred Stock [Member] | Comstock Growth Fund II, L.C. [Member] | Notes Payable, Other Payables [Member] | Note Exchange Agreement [Member]              
Related Party Transaction [Line Items]              
Preferred stock liquidation value per share $ 5.00