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GOODWILL AND INTANGIBLE ASSETS (Details 3) (Software, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Software
Property, Plant and Equipment
Amortization period	7 years
Amortization expense	$ 4.5us-gaap_CapitalizedComputerSoftwareAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember	$ 4.5us-gaap_CapitalizedComputerSoftwareAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Expected annual amortization expense on acquired software for 2015 through 2018	4.5arcb_CapitalizedComputerSoftwareExpectedAnnualAmortizationNextFourYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Expected amortization expense on acquired software for 2019	$ 2.1arcb_CapitalizedComputerSoftwareExpectedAnnualAmortizationYearFive / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember

X

- Definition

The amount expected to be charged to expense annually for amortization of capitalized computer software costs during the four fiscal years following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	arcb_CapitalizedComputerSoftwareExpectedAnnualAmortizationNextFourYears
Namespace Prefix:	arcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount expected to be charged to expense for amortization of capitalized computer software costs during the fifth fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	arcb_CapitalizedComputerSoftwareExpectedAnnualAmortizationYearFive
Namespace Prefix:	arcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

-SubTopic 20

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

+ Details

Name:	us-gaap_CapitalizedComputerSoftwareAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration