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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Nonrecurring (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended 24 Months Ended
Oct. 01, 2020
Oct. 01, 2019
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill impairment $ 0     $ (20,000) $ (20,000)
Long-lived assets impairment       (6,500)  
Total Losses/Impairment     $ (26,500) (26,514)  
Level 3 | Nonrecurring basis          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill     83,842 83,842  
Long-lived assets     6,805 6,805  
Assets     $ 90,647 90,647 0
Goodwill impairment       (20,000)  
Long-lived assets impairment       (6,514)  
Total Losses/Impairment       (26,514)  
ArcBest          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill impairment       (20,000) $ (20,000)
Long-lived assets impairment       (6,500)  
ArcBest | Customer relationships          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Impairment of customer relationship intangibles       (6,000)  
ArcBest | Revenue Equipment          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Impairment of revenue equipment       $ (500)  
ArcBest | Level 3 | Customer relationships | Nonrecurring basis          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Impairment of customer relationship intangibles   $ (6,000)      
ArcBest | Level 3 | Revenue Equipment | Nonrecurring basis          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Impairment of revenue equipment   $ (500)