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BUSINESS COMBINATIONS (Details)
employee in Thousands, $ in Thousands
6 Months Ended
Aug. 03, 2021
USD ($)
employee
location
Jun. 29, 2021
USD ($)
Mar. 27, 2021
USD ($)
Apr. 17, 2020
USD ($)
Jun. 30, 2021
USD ($)
Business Acquisition [Line Items]          
Goodwill recognized         $ 15,958
Vertex Energy Inc          
Business Acquisition [Line Items]          
Consideration to acquire assets   $ 140,000      
2021 Acquisitions          
Business Acquisition [Line Items]          
Purchase price     $ 22,900    
Goodwill recognized     $ 16,000    
2020 Acquisitions          
Business Acquisition [Line Items]          
Purchase price       $ 8,800  
Goodwill recognized       $ 1,400  
HydroChemPSC | Subsequent Event          
Business Acquisition [Line Items]          
Payments to acquire businesses, gross $ 1,250,000        
HydroChemPSC | Subsequent Event | HydroChemPSC          
Business Acquisition [Line Items]          
Entity number of employees | employee 5        
Number of service locations (more than) | location 240