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INCOME TAXES (Details 4) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013
Operating loss and contribution carryforwards |  |  |
Net decrease in valuation allowance | $ 3.2 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |
State |  |  |
Operating loss and contribution carryforwards |  |  |
Operating loss carryforwards |  | 31.6 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Contribution carryforwards |  | 0.9 arcb_ContributionCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Majority of state net operating loss and contribution carryforwards, expiration period one |  | 15 years |
Majority of state net operating loss and contribution carryforwards, expiration period two |  | 20 years |
State | Minimum |  |  |
Operating loss and contribution carryforwards |  |  |
State net operating loss and contribution carryforwards expiration period |  | 5 years |
State | Maximum |  |  |
Operating loss and contribution carryforwards |  |  |
State net operating loss and contribution carryforwards expiration period |  | 20 years |
State | Panther |  |  |
Operating loss and contribution carryforwards |  |  |
Operating loss carryforwards |  | 10.6 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / dei_LegalEntityAxis = arcb_PantherPremiumLogisticsMember |
State | Panther | Minimum |  |  |
Operating loss and contribution carryforwards |  |  |
Net operating loss carryforwards expiration period |  | 5 years |
State | Panther | Maximum |  |  |
Operating loss and contribution carryforwards |  |  |
Net operating loss carryforwards expiration period |  | 20 years |
Foreign |  |  |
Operating loss and contribution carryforwards |  |  |
Valuation allowance related to net operating loss carryforwards |  | 0.3 us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |
Federal | Panther |  |  |
Operating loss and contribution carryforwards |  |  |
Operating loss carryforwards |  | 2.1 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / dei_LegalEntityAxis = arcb_PantherPremiumLogisticsMember |
Net operating loss carryforwards expiration period |  | 17 years |
Certain state net operating losses and state deferred tax assets |  |  |
Operating loss and contribution carryforwards |  |  |
Net decrease in valuation allowance |  |  | 1.5 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = arcb_StateOperatingLossesandDeferredTaxAssetsMember
Deferred tax assets related to the nonunion defined benefit pension plan |  |  |
Operating loss and contribution carryforwards |  |  |
Net decrease in valuation allowance | $ 4.0 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = arcb_DeferredTaxAssetsForNonunionDefinedBenefitPensionPlanMember |  |

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