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Related Party Transaction - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Aug. 16, 2019
Jul. 26, 2019
Sep. 30, 2013
Schedule of Other Related Party Transactions [Line Items]                  
Total Long Term Finance Lease Obligations to Related Parties         $ 3,367,000        
Real property and buildings                  
Schedule of Other Related Party Transactions [Line Items]                  
Sublease income $ 6,000 $ 15,000 $ 18,000 $ 40,000          
TMG                  
Schedule of Other Related Party Transactions [Line Items]                  
Payroll related expenses 0 3,000 4,000 10,000          
Purchase of supplies and services $ 0 53,000 44,000 88,000          
TMG | Operating Leases Related Party | Land                  
Schedule of Other Related Party Transactions [Line Items]                  
Sublease income     $ 9,000 $ 9,000          
Applied Cryo Technologies                  
Schedule of Other Related Party Transactions [Line Items]                  
Ownership percentage 51.00%   51.00%            
Purchase of equipment and services     $ 302,000            
Payment for equipment repairs and services     110,000            
Secured Promissory Note | M/G Finance Co., Ltd.                  
Schedule of Other Related Party Transactions [Line Items]                  
Debt instrument, face amount             $ 5,000,000    
Senior Secured Term Note                  
Schedule of Other Related Party Transactions [Line Items]                  
Debt instrument, face amount                 $ 20,500,000
Former Executive Chairman of Board of Directors of American Electric Technologies Inc | Loan Agreement | M&I Brazil | Senior Secured Term Note                  
Schedule of Other Related Party Transactions [Line Items]                  
Line of credit facility, maximum borrowing capacity               $ 300,000  
Loan facility drawn and outstanding $ 200,000   $ 200,000            
Interest rate               10.00%  
TMG | Operating Leases Related Party | Land                  
Schedule of Other Related Party Transactions [Line Items]                  
Sublease income $ 3,000 $ 3,000              
Subsidiaries | Stabilis LLC                  
Schedule of Other Related Party Transactions [Line Items]                  
Total Long Term Finance Lease Obligations to Related Parties         $ 1,500,000        
Capital lease obligation, lease term         24 months        
Capital lease obligation, interest rate         10.00%        
Subsidiaries | TMG                  
Schedule of Other Related Party Transactions [Line Items]                  
Total Long Term Finance Lease Obligations to Related Parties           $ 10,100,000      
Percentage of beneficial ownership           25.00%      
Annual interest rate on lease agreement           6.00%      
Percentage of outstanding lease obligations repaid           80.00%      
Capital lease obligation, lease term           36 months      
Capital lease obligation, interest rate           10.00%