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INCOME TAXES (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income taxes
Reserve for uncertain tax positions	$ 0.7us-gaap_UnrecognizedTaxBenefits	$ 0.3us-gaap_UnrecognizedTaxBenefits	$ 0us-gaap_UnrecognizedTaxBenefits
Federal, State, and Local Jurisdiction
Other tax disclosures
Interest paid on income tax obligations	0arcb_IncomeTaxInterestPaid / us-gaap_IncomeTaxAuthorityAxis = arcb_DomesticStateAndLocalJurisdictionMember
Federal, State, and Local Jurisdiction | Maximum
Other tax disclosures
Interest paid on income tax obligations		0.1arcb_IncomeTaxInterestPaid / us-gaap_IncomeTaxAuthorityAxis = arcb_DomesticStateAndLocalJurisdictionMember / us-gaap_RangeAxis = us-gaap_MaximumMember	0.1arcb_IncomeTaxInterestPaid / us-gaap_IncomeTaxAuthorityAxis = arcb_DomesticStateAndLocalJurisdictionMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Foreign
Other tax disclosures
Interest paid on income tax obligations		0.2arcb_IncomeTaxInterestPaid / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Interest accrued			0.2arcb_IncomeTaxInterestAccruedDuringPeriod / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Foreign | Maximum
Other tax disclosures
Remaining accrued interest	0.1arcb_IncomeTaxInterestAccruedBalance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Federal | Maximum
Income taxes
Adjustment for completed audit	$ 0.1us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- Definition

The amount of accrued interest on income tax obligations as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

The amount of interest accrued during the period on income tax obligations.

+ References

No definition available.

+ Details

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X

- Definition

The amount of interest paid during the period related to income taxes.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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