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OPERATING SEGMENT DATA - Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenues      
Operating revenues $ 5,324,052 $ 3,980,067 $ 2,940,163
Asset Based      
Revenues      
Operating revenues 2,896,284 2,470,529 1,998,549
ArcBest      
Revenues      
Operating revenues 2,128,394 1,291,679 770,560
FleetNet      
Revenues      
Operating revenues 295,043 213,882 166,654
Operating Segments | Asset Based      
Revenues      
Operating revenues 3,010,900 2,573,773 2,092,031
Operating Segments | ArcBest      
Revenues      
Operating revenues 2,139,272 1,300,626 779,115
Operating Segments | FleetNet      
Revenues      
Operating revenues 343,056 254,087 205,049
Other and eliminations      
Revenues      
Operating revenues $ (169,176) $ (148,419) $ (136,032)