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ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION - Organization (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Organization and description of business        
Number of reportable operating segments | segment   3    
Gain on sale of property and equipment   $ 2,376 $ 5,247 $ 59
Asset Based        
Organization and description of business        
Percentage of the Company's revenues, before other revenues and intercompany eliminations, represented by the Asset-Based segment   68.00%    
Asset Based | Subsequent Event        
Organization and description of business        
Gain on sale of property and equipment $ 8,500      
Asset Based | Unionized employees concentration risk | Number of employees        
Organization and description of business        
Percentage of Asset-Based segment employees covered under collective bargaining agreement with the IBT   82.00%