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TRANSACTIONS WITH AFFILIATES - Agreements (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
item
bbl
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
TransMontaigne Management Company, LLC      
Transactions with affiliates      
Administration fee (in Percentage) 1.00%    
June 2020 terminaling services agreement-Brownsville LLC | Frontera | Brownsville terminals      
Transactions with affiliates      
Storage capacity agreed to be provided (in barrels) | bbl 301,000    
Throughput revenue $ 2.6 $ 2.5 $ 1.9
June 2020 terminaling services agreement-Brownsville LLC | Frontera | Brownsville terminals | Minimum      
Transactions with affiliates      
Notice period for termination of service agreement 90 days    
June 2020 terminaling services agreement-Brownsville LLC | Frontera | Brownsville terminals | Maximum      
Transactions with affiliates      
Notice period for termination of service agreement 180 days    
Operations and reimbursement agreement-Frontera | Frontera      
Transactions with affiliates      
Ownership interest in joint venture (as a percent) 50.00%    
Revenue recognized $ 5.8 5.8 5.3
Terminaling services agreement- Gulf Coast Terminals | Associated Asphalt Marketing, LLC | Gulf Coast Terminals      
Transactions with affiliates      
Automatic renewal period of service agreement 2 years    
Notice period for termination of service agreement 180 days    
Storage capacity agreed to be provided (in barrels) | bbl 750,000    
Throughput revenue $ 8.5 8.5 0.0
Operating and administrative agreement SeaPort Midstream Partners, LLC | TMS | Central Services      
Transactions with affiliates      
Number of refined terminals operated | item 2    
Operating and administrative agreement SeaPort Midstream Partners, LLC | SeaPort Midstream Partners, LLC | SeaPort Midstream Holdings, LLC | Central Services      
Transactions with affiliates      
Ownership interest in joint venture (as a percent) 51.00%    
Operating and administrative agreement SeaPort Midstream Partners, LLC | SeaPort Midstream Partners, LLC | Central Services      
Transactions with affiliates      
Revenue recognized $ 3.4 3.4 1.2
Automatic renewal period of service agreement 1 year    
Notice period for termination of service agreement 180 days    
Operations and reimbursement agreement SeaPort Sound Terminal, LLC | SeaPort Sound Terminal, LLC | Central Services      
Transactions with affiliates      
Revenue recognized $ 7.2 0.7 0.0
Reimbursement agreement | ArcLight | Central Services      
Transactions with affiliates      
Revenue recognized 1.2 $ 0.1 $ 0.0
Services Agreement | TransMontaigne Management Company, LLC      
Transactions with affiliates      
Aggregate fees paid $ 0.8