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INCOME TAXES (New Accounting Pronouncements) (Details)	3 Months Ended
	Mar. 31, 2017
ASC Topic 718, Compensation – Stock Compensation
New Accounting Pronouncements
Tax benefit as a result of applying provisions of new accounting policy	0.60%

X

- Definition

Amount of tax benefit, as a percent, from the effect of applying the new accounting principle applied during the period of adoption.

+ References

No definition available.

+ Details

Name:	arcb_NewAccountingPronouncementTaxBenefitImpactPercent
Namespace Prefix:	arcb_
Data Type:	num:percentItemType
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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=arcb_AccountingStandardsUpdate201609Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: