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EMPLOYEE BENEFIT PLANS (Details 6) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Long-Term Cash Incentive Plan |  |  |
Earning period of Long-term cash incentive plan | 3 years |  |
Incentive payments accrued for Long-Term Cash Incentive Plan | $ 7.6 arcb_DeferredCompensationCashbasedArrangementsLiabilityNoncurrent | $ 4.2 arcb_DeferredCompensationCashbasedArrangementsLiabilityNoncurrent | $ 0 arcb_DeferredCompensationCashbasedArrangementsLiabilityNoncurrent
Other Plans |  |  |
Cash surrender value of life insurance policies | 44.5 us-gaap_CashSurrenderValueOfLifeInsurance | 43.8 us-gaap_CashSurrenderValueOfLifeInsurance |
Recognized gains associated with changes in the cash surrender value and proceeds from life insurance policies | 3.8 arcb_LifeInsurancePolicyRecognizedGains | 3.8 arcb_LifeInsurancePolicyRecognizedGains | 2.1 arcb_LifeInsurancePolicyRecognizedGains
401(k) Plan |  |  |
Defined Contribution Plans |  |  |
Maximum percentage of salary permitted to be deferred by plan participants | 69.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContribution401KPlanMember |  |
Rate of employer match on participant contributions | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContribution401KPlanMember |  |
Maximum percentage of participants compensation that is eligible for 50% matching contribution | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContribution401KPlanMember |  |
Expense for employer contribution to defined contribution plan | 4.9 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContribution401KPlanMember | 4.5 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContribution401KPlanMember | 3.8 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContribution401KPlanMember
Defined Contribution Plan |  |  |
Defined Contribution Plans |  |  |
Expense for employer contribution to defined contribution plan | $ 9.0 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContributionPlanMember | $ 5.9 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContributionPlanMember | $ 0 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContributionPlanMember
Period of service for participants' full vesting in the employer's contributions | 3 years |  |

X
- Definition Amounts that were accrued at the end of the period under the Long-Term Cash Incentive Plan for payment in future periods. + References No definition available. + Details
Name: | arcb_DeferredCompensationCashbasedArrangementsLiabilityNoncurrent
Namespace Prefix: | arcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The minimum period that the individual is required to perform services in order to be fully vested under the deferred compensation arrangement. + References No definition available. + Details
Name: | arcb_DefinedContributionPlanRequisiteServicePeriod
Namespace Prefix: | arcb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the recognized gains associated with changes in the cash surrender value and proceeds from life insurance policies. + References No definition available. + Details
Name: | arcb_LifeInsurancePolicyRecognizedGains
Namespace Prefix: | arcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
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Namespace Prefix: | arcb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the earning period of incentives under the Long-Term Cash Incentive Plan. + References No definition available. + Details
Name: | arcb_LongTermCashIncentivePlanEarningPeriod
Namespace Prefix: | arcb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: | arcb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |