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GOODWILL AND INTANGIBLE ASSETS (Goodwill) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill by reportable operating segment    
Balance at the beginning of the period $ 108,875 $ 96,465
Goodwill acquired   12,640
Goodwill divested (661) (842)
Purchase accounting adjustments 106 612
Balance at the end of the period 108,320 108,875
ArcBest    
Goodwill by reportable operating segment    
Balance at the beginning of the period 108,245 95,835
Goodwill acquired   12,640
Goodwill divested (661) (842)
Purchase accounting adjustments 106 612
Balance at the end of the period 107,690 108,245
FleetNet    
Goodwill by reportable operating segment    
Balance at the beginning of the period 630 630
Balance at the end of the period $ 630 $ 630