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LONG-TERM DEBT AND FINANCING ARRANGEMENTS - Assets securing notes (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Arrangements |  |
Total assets securing notes payable or held under finance leases | $ 353,164 | $ 353,093
Less accumulated depreciation and amortization | 135,538 | 115,424
Net assets securing notes payable or held under finance leases | 217,626 | 237,669
Revenue equipment |  |
Financing Arrangements |  |
Total assets securing notes payable or held under finance leases | 326,914 | 326,823
Service, office, and other equipment |  |
Financing Arrangements |  |
Total assets securing notes payable or held under finance leases | $ 26,250 | $ 26,270

X
- Definition Amount of accumulated depreciation and amortization on property, plant and equipment pledged to secure a debt instrument. + References No definition available. + Details
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Namespace Prefix: | arcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The gross amount of property, plant and equipment pledged to secure a debt instrument. + References No definition available. + Details
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Namespace Prefix: | arcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The net amount of property, plant and equipment pledged to secure a debt instrument. + References No definition available. + Details
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Namespace Prefix: | arcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |