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GOODWILL AND INTANGIBLE ASSETS - Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 01, 2022
Oct. 01, 2021
Dec. 31, 2022
Dec. 31, 2021
Goodwill by reportable operating segment        
Balance at the beginning of the period     $ 300,337 $ 88,320
Goodwill acquired       213,969
Goodwill divested       (1,952)
Purchase accounting adjustment     5,045  
Balance at the end of the period     305,382 300,337
Accumulated impairment     (20,000) (20,000)
Goodwill impairment $ 0 $ 0    
ArcBest        
Goodwill by reportable operating segment        
Balance at the beginning of the period     299,707 87,690
Goodwill acquired       213,969
Goodwill divested       (1,952)
Purchase accounting adjustment     5,045  
Balance at the end of the period     304,752 299,707
Accumulated impairment     (20,000) (20,000)
FleetNet        
Goodwill by reportable operating segment        
Balance at the beginning of the period     630 630
Balance at the end of the period     $ 630 $ 630