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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: