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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (FV of assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Oct. 01, 2019
Dec. 31, 2019
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Goodwill impairment     $ (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
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)
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