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POSTRETIREMENT BENEFIT PLANS - Multiemployer Plans (Details) | 3 Months Ended
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Mar. 31, 2022 plan
Nonunion Defined Benefit Pension Plan | Asset Based |
Multiemployer Plans |
Number of multiemployer plans to which ABF Freight currently contributes | 25

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- Definition Represents the number of multiemployer plans to which the reporting entity currently contributes. + References No definition available. + Details
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Namespace Prefix: | arcb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=arcb_AssetBasedSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |