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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 | $ 0.8 us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = arcb_DeathAndRetirementBenefitsAdditionalBenefitPlanMember | $ 0.8 us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = arcb_DeathAndRetirementBenefitsAdditionalBenefitPlanMember
Deferred salary agreements |  |
Deferred Compensation Plans |  |
Recorded liabilities | 4.7 us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = arcb_DeferredSalaryAgreementMember | 5.2 us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = arcb_DeferredSalaryAgreementMember
Voluntary Savings Plan - mutual funds held in trust |  |
Deferred Compensation Plans |  |
Recorded assets | 3.0 us-gaap_DeferredCompensationPlanAssets / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = arcb_VoluntarySavingsPlanMutualFundsMember | 3.1 us-gaap_DeferredCompensationPlanAssets / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = arcb_VoluntarySavingsPlanMutualFundsMember
Recorded liabilities | $ 3.0 us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = arcb_VoluntarySavingsPlanMutualFundsMember | $ 3.1 us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = arcb_VoluntarySavingsPlanMutualFundsMember
Minimum period for election to defer receipt of a portion of salary and incentive compensation | 6 months |

X
- Definition Represents the minimum period prior to the end of the performance period for making an election to defer receipt of a portion of salary and incentive compensation. + References No definition available. + Details
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- Details
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Balance Type: | na
Period Type: | duration

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Details
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- Details
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