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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Long-term debt obligations |  |
Long-term debt | $ 127,730 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities | $ 112,845 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
Less current portion | 25,256 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent | 31,513 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term debt, less current portion | 102,474 us-gaap_LongTermDebtAndCapitalLeaseObligations | 81,332 us-gaap_LongTermDebtAndCapitalLeaseObligations
Weighted-average interest rate (as a percent) | 1.70%us-gaap_DebtWeightedAverageInterestRate |
Payments under long-term debt obligations |  |
Due in one year or less | 27,300 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueCurrent |
Due after one year through two years | 20,899 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInTwoYears |
Due after two years through three years | 15,699 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInThreeYears |
Due after three years through four years | 2,607 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFourYears |
Due after four years through five years | 2,732 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFiveYears |
Due after five years | 70,019 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueThereafter |
Total payments | 139,256 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDue |
Less amounts representing interest | 11,526 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesInterestIncludedInPayments |
Long-term debt | 127,730 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities | 112,845 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
Term Loan |  |
Long-term debt obligations |  |
Long-term debt | 70,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember | 83,750 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember
Interest rate (as a percent) | 1.40%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |
Payments under long-term debt obligations |  |
Long-term debt | 70,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember | 83,750 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember
Credit Facility |  |
Long-term debt obligations |  |
Long-term debt | 70,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |
Payments under long-term debt obligations |  |
Due in one year or less | 1,124 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueCurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |
Due after one year through two years | 1,727 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInTwoYears / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |
Due after two years through three years | 2,223 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInThreeYears / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |
Due after three years through four years | 2,381 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFourYears / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |
Due after four years through five years | 2,500 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFiveYears / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |
Due after five years | 70,000 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueThereafter / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |
Total payments | 79,955 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDue / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |
Less amounts representing interest | 9,955 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesInterestIncludedInPayments / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |
Long-term debt | 70,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |
Notes payable |  |
Long-term debt obligations |  |
Long-term debt | 56,759 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | 22,082 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
Weighted-average interest rate (as a percent) | 2.00%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |
Payments under long-term debt obligations |  |
Long-term debt | 56,759 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | 22,082 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
Notes payable | Revenue equipment |  |
Long-term debt obligations |  |
Long-term debt | 56,759 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember |
Payments under long-term debt obligations |  |
Due in one year or less | 25,959 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueCurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember |
Due after one year through two years | 18,959 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInTwoYears / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember |
Due after two years through three years | 13,257 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInThreeYears / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember |
Total payments | 58,175 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDue / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember |
Less amounts representing interest | 1,416 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesInterestIncludedInPayments / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember |
Long-term debt | 56,759 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember |
Capital lease obligations |  |
Long-term debt obligations |  |
Long-term debt | 971 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember | 7,013 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember
Weighted-average interest rate (as a percent) | 5.80%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
Payments under long-term debt obligations |  |
Long-term debt | 971 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember | 7,013 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember
Capital lease obligations | Land and structures (terminals) |  |
Long-term debt obligations |  |
Long-term debt | 960 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandBuildingsAndImprovementsMember |
Payments under long-term debt obligations |  |
Due in one year or less | 206 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueCurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandBuildingsAndImprovementsMember |
Due after one year through two years | 213 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInTwoYears / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandBuildingsAndImprovementsMember |
Due after two years through three years | 219 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInThreeYears / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandBuildingsAndImprovementsMember |
Due after three years through four years | 226 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFourYears / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandBuildingsAndImprovementsMember |
Due after four years through five years | 232 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFiveYears / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandBuildingsAndImprovementsMember |
Due after five years | 19 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueThereafter / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandBuildingsAndImprovementsMember |
Total payments | 1,115 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDue / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandBuildingsAndImprovementsMember |
Less amounts representing interest | 155 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesInterestIncludedInPayments / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandBuildingsAndImprovementsMember |
Long-term debt | 960 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandBuildingsAndImprovementsMember |
Capital lease obligations | Service, office, and other equipment |  |
Long-term debt obligations |  |
Long-term debt | 11 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherMachineryAndEquipmentMember |
Payments under long-term debt obligations |  |
Due in one year or less | 11 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueCurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherMachineryAndEquipmentMember |
Total payments | 11 arcb_MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDue / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherMachineryAndEquipmentMember |
Long-term debt | $ 11 us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherMachineryAndEquipmentMember |

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