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GOODWILL AND INTANGIBLE ASSETS - Goodwill (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2020 | Dec. 31, 2021 | Dec. 31, 2019
Goodwill by reportable operating segment |  |  |
Balance at the beginning of the period |  | $ 88,320 |
Goodwill acquired |  | 213,969 |
Goodwill divested |  | (1,952) |
Balance at the end of the period |  | 300,337 |
Accumulated impairment |  | (20,000) |
Goodwill impairment | $ 0 |  |
ArcBest |  |  |
Goodwill by reportable operating segment |  |  |
Balance at the beginning of the period |  | 87,690 |
Goodwill acquired |  | 213,969 |
Goodwill divested |  | (1,952) |
Balance at the end of the period |  | 299,707 |
Accumulated impairment |  | (20,000) |
Goodwill impairment |  |  | $ 20,000
FleetNet |  |  |
Goodwill by reportable operating segment |  |  |
Balance at the beginning of the period |  | 630 |
Balance at the end of the period |  | $ 630 |

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