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LONG-TERM DEBT AND FINANCING ARRANGEMENTS - Letters of credit & Surety bonds (Details) $ in Millions	Jun. 30, 2021 USD ($)
Financing Arrangements
Outstanding letters of credit	$ 11.2
Accounts receivable securitization borrowings
Financing Arrangements
Outstanding letters of credit	10.1
Credit Facility
Financing Arrangements
Outstanding letters of credit	0.6
Surety bonds
Financing Arrangements
Outstanding surety bonds under uncollateralized bond programs	$ 61.6

X

- Definition

Represents the total amount of outstanding surety bonds under the uncollateralized bond program related to the self-insurance program as of the reporting date.

+ References

No definition available.

+ Details

Name:	arcb_SuretyBondsAmountOutstandingUnderUncollateralizedProgram
Namespace Prefix:	arcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_DebtInstrumentAxis=arcb_AccountsReceivableSecuritizationProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_SuretyBondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: