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EMPLOYEE BENEFIT PLANS (Details 5) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Additional benefit plan, death and retirement benefits    
Deferred Compensation Plans    
Recorded liabilities $ 0.8us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= arcb_DeathAndRetirementBenefitsAdditionalBenefitPlanMember
$ 0.8us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis
= arcb_DeathAndRetirementBenefitsAdditionalBenefitPlanMember
Deferred salary agreements    
Deferred Compensation Plans    
Recorded liabilities 4.7us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= arcb_DeferredSalaryAgreementMember
5.2us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= arcb_DeferredSalaryAgreementMember
Voluntary Savings Plan - mutual funds held in trust    
Deferred Compensation Plans    
Recorded assets 3.0us-gaap_DeferredCompensationPlanAssets
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= arcb_VoluntarySavingsPlanMutualFundsMember
3.1us-gaap_DeferredCompensationPlanAssets
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= arcb_VoluntarySavingsPlanMutualFundsMember
Recorded liabilities $ 3.0us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= arcb_VoluntarySavingsPlanMutualFundsMember
$ 3.1us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= arcb_VoluntarySavingsPlanMutualFundsMember
Minimum period for election to defer receipt of a portion of salary and incentive compensation 6 months