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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (FV of assets) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Goodwill impairment |  |  | $ (20,000)
Long-lived assets impairment |  |  | (6,500)
Total Losses/Impairment |  | $ (26,500) | (26,514)
Level 3 | Nonrecurring basis |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Goodwill |  | 83,842 | 83,842
Long-lived assets |  | 6,805 | 6,805
Assets |  | $ 90,647 | 90,647
Goodwill impairment |  |  | (20,000)
Long-lived assets impairment |  |  | (6,514)
Total Losses/Impairment |  |  | (26,514)
ArcBest |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Goodwill impairment |  |  | (20,000)
Long-lived assets impairment |  |  | (6,500)
ArcBest | Customer relationships |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of customer relationship intangibles |  |  | (6,000)
ArcBest | Revenue Equipment |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of revenue equipment |  |  | $ (500)
ArcBest | Level 3 | Customer relationships | Nonrecurring basis |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of customer relationship intangibles | $ 6,000 |  |
ArcBest | Level 3 | Revenue Equipment | Nonrecurring basis |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of revenue equipment | $ 500 |  |

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale) and the amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References No definition available. + Details
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