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ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION (Details) (Freight Transportation (ABF Freight))
 0 Months Ended 12 Months Ended
Nov. 03, 2013
Dec. 31, 2014
Organization and description of business    
Percentage of the Company's revenues, before other revenues and intercompany eliminations, represented by ABF Freight   73.00%arcb_SegmentPercentageOfRevenueBeforeOtherRevenuesAndIntercompanyEliminations
Wage rate reduction under collective bargaining agreement upon implementation date (as a percent) 7.00%arcb_CollectiveBargainingAgreementImmediateWageIncreaseDecrease  
Wage rate increase for next three years of collective bargaining agreement (as a percent) 2.00%arcb_CollectiveBargainingAgreementWageRateIncreaseDecreaseYearsTwoThroughFour  
Wage rate increase in fifth year of collective bargaining agreement (as a percent) 2.50%arcb_CollectiveBargainingAgreementWageRateIncreaseDecreaseYearFive  
Reduction in compensated vacation under collective bargaining agreement 5 days  
Approximate initial reduction in combined total contractual wage and benefit rate under collective bargaining agreement (as a percent) 4.00%arcb_CollectiveBargainingAgreementTotalContractualWageAndBenefitRateDecrease  
Minimum
    
Organization and description of business    
Estimated increase in compounded annual contractual wage and benefit contribution rates in second through fifth years (as a percent)   2.50%arcb_CombinedContractualWageAndBenefitContributionRateCompoundedAnnualIncrease
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= arcb_FreightTransportationMember
Maximum
    
Organization and description of business    
Estimated increase in compounded annual contractual wage and benefit contribution rates in second through fifth years (as a percent)   3.00%arcb_CombinedContractualWageAndBenefitContributionRateCompoundedAnnualIncrease
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= arcb_FreightTransportationMember
Unionized employees concentration risk | Number of employees
    
Organization and description of business    
Percentage of ABF Freight's employees covered under collective bargaining agreement with the IBT   79.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_NumberOfEmployeesTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_UnionizedEmployeesConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= arcb_FreightTransportationMember