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EMPLOYEE BENEFIT PLANS - Plan summary (Details)	12 Months Ended
	Dec. 31, 2022
Postretirement Health Benefit Plan
Postretirement benefit plans
Unrecognized prior service credit, amortization period	9 years

X

- Definition

The period over which the unrecognized prior service cost (credit) is being amortized.

+ References

No definition available.

+ Details

Name:	arcb_DefinedBenefitPlanUnrecognizedPriorServiceCreditAmortizationPeriod
Namespace Prefix:	arcb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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

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

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_DefinedBenefitPostretirementHealthCoverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: