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ACCOUNTING POLICIES (Accounting Pronouncements Not Yet Adopted) (Details) - Subsequent Event $ in Millions	Jan. 01, 2019 USD ($)
Assets and liabilities
Consolidated right-of-use asset under operating lease contracts that have been executed but not yet commenced	$ 17
Lease liability from operating lease contracts that have been executed but not yet commenced	17
ASC Topic 842, Leases | Adjustment
Assets and liabilities
Consolidated right-of-use asset	60
Lease liability	$ 60

X

- Definition

Present value of lessee's expected discounted obligation for lease payments from operating lease contracts that have been executed but not yet commenced.

+ References

No definition available.

+ Details

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Namespace Prefix:	arcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's expected right to use underlying asset under operating lease contracts that have been executed but not yet commenced.

+ References

No definition available.

+ Details

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Namespace Prefix:	arcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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- Details

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- Details

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