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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Details 2) (Secured notes payable and capital leases, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financing Arrangements    
Total assets securitizing notes payable or held under capital leases $ 90,640arcb_DebtInstrumentCollateralPropertyPlantAndEquipmentGross $ 62,165arcb_DebtInstrumentCollateralPropertyPlantAndEquipmentGross
Less accumulated amortization 26,305arcb_DebtInstrumentCollateralAccumulatedDepreciationAndAmortizationPropertyPlantAndEquipment 26,847arcb_DebtInstrumentCollateralAccumulatedDepreciationAndAmortizationPropertyPlantAndEquipment
Net assets securitizing notes payable or held under capital leases 64,335arcb_DebtInstrumentCollateralPropertyPlantAndEquipmentNet 35,318arcb_DebtInstrumentCollateralPropertyPlantAndEquipmentNet
Revenue equipment    
Financing Arrangements    
Total assets securitizing notes payable or held under capital leases 88,591arcb_DebtInstrumentCollateralPropertyPlantAndEquipmentGross
/ us-gaap_LongtermDebtTypeAxis
= arcb_SecuredNotesPayableAndCapitalLeaseObligationsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember		 58,613arcb_DebtInstrumentCollateralPropertyPlantAndEquipmentGross
/ us-gaap_LongtermDebtTypeAxis
= arcb_SecuredNotesPayableAndCapitalLeaseObligationsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
Land and structures (terminals)    
Financing Arrangements    
Total assets securitizing notes payable or held under capital leases 1,794arcb_DebtInstrumentCollateralPropertyPlantAndEquipmentGross
/ us-gaap_LongtermDebtTypeAxis
= arcb_SecuredNotesPayableAndCapitalLeaseObligationsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandBuildingsAndImprovementsMember		 1,794arcb_DebtInstrumentCollateralPropertyPlantAndEquipmentGross
/ us-gaap_LongtermDebtTypeAxis
= arcb_SecuredNotesPayableAndCapitalLeaseObligationsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandBuildingsAndImprovementsMember
Service, office, and other equipment    
Financing Arrangements    
Total assets securitizing notes payable or held under capital leases $ 255arcb_DebtInstrumentCollateralPropertyPlantAndEquipmentGross
/ us-gaap_LongtermDebtTypeAxis
= arcb_SecuredNotesPayableAndCapitalLeaseObligationsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherMachineryAndEquipmentMember		 $ 1,758arcb_DebtInstrumentCollateralPropertyPlantAndEquipmentGross
/ us-gaap_LongtermDebtTypeAxis
= arcb_SecuredNotesPayableAndCapitalLeaseObligationsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherMachineryAndEquipmentMember