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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair value disclosure    
Debt obligations $ 155,476us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities $ 127,730us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
Carrying value    
Fair value disclosure    
Debt obligations 154,547us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 126,759us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair value disclosure    
Fair value disclosure    
Debt obligations 154,565us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 126,743us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Credit Facility    
Fair value disclosure    
Debt obligations 70,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember		  
Credit Facility | Carrying value    
Fair value disclosure    
Debt obligations 70,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember		  
Credit Facility | Fair value disclosure    
Fair value disclosure    
Debt obligations 70,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember		  
Term Loan    
Fair value disclosure    
Debt obligations   70,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Term Loan | Carrying value    
Fair value disclosure    
Debt obligations   70,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Term Loan | Fair value disclosure    
Fair value disclosure    
Debt obligations   70,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Accounts receivable securitization program    
Fair value disclosure    
Debt obligations 35,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_LongtermDebtTypeAxis
= arcb_AccountsReceivableSecuritizationProgramMember		  
Accounts receivable securitization program | Carrying value    
Fair value disclosure    
Debt obligations 35,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= arcb_AccountsReceivableSecuritizationProgramMember		  
Accounts receivable securitization program | Fair value disclosure    
Fair value disclosure    
Debt obligations 35,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= arcb_AccountsReceivableSecuritizationProgramMember		  
Notes payable    
Fair value disclosure    
Debt obligations 49,547us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember		 56,759us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Notes payable | Carrying value    
Fair value disclosure    
Debt obligations 49,547us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember		 56,759us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Notes payable | Fair value disclosure    
Fair value disclosure    
Debt obligations $ 49,565us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember		 $ 56,743us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember