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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

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- 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

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

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- 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

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

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