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ACCOUNTING POLICIES (Book Overdrafts) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts Payable |  |
Book Overdrafts |  |
Amount of book overdrafts | $ 14.7 | $ 17.5

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- Definition Carrying value as of the balance sheet date of issued checks that have not cleared the bank. + References No definition available. + Details
Name: | arcb_BookOverdrafts
Namespace Prefix: | arcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | arcb_BookOverdraftsAbstract
Namespace Prefix: | arcb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=arcb_AccountsPayableBalanceSheetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |