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

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