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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Financing arrangements - Letters of credit & Surety bonds) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Financing Arrangements
Outstanding letters of credit	$ 12.8	$ 17.2
Accounts receivable securitization borrowings
Financing Arrangements
Outstanding letters of credit	12.2	16.6
Surety bonds
Financing Arrangements
Outstanding surety bonds under uncollateralized bond programs	$ 62.3	$ 49.1

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

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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_SuretyBondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: