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GOODWILL AND INTANGIBLE ASSETS (Intangible) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Finite-lived intangible assets    
Weighted Average Amortization Period 14 years  
Cost $ 54,015 $ 61,463
Accumulated Amortization 27,483 24,814
Net Value 26,532 36,649
Total intangible assets    
Cost 86,315 93,763
Net Value 58,832 68,949
Impairment Assessment of Intangible Assets    
Long-lived assets impairment 6,500  
ArcBest    
Impairment Assessment of Intangible Assets    
Long-lived assets impairment 6,500  
Trade name    
Indefinite-lived intangible assets    
Net Value $ 32,300 32,300
Customer relationships    
Finite-lived intangible assets    
Weighted Average Amortization Period 14 years  
Cost $ 52,721 60,431
Accumulated Amortization 26,667 24,130
Net Value 26,054 36,301
Customer relationships | ArcBest    
Impairment Assessment of Intangible Assets    
Impairment of finite-lived intangible assets $ 6,000  
Other intangible assets    
Finite-lived intangible assets    
Weighted Average Amortization Period 11 years  
Cost $ 1,294 1,032
Accumulated Amortization 816 684
Net Value 478 $ 348
Revenue Equipment | ArcBest    
Impairment Assessment of Intangible Assets    
Impairment of revenue equipment $ 500