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ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Jan. 02, 2015
Apr. 30, 2014
Acquisitions      
Net cash consideration $ 5,170us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired    
Smart Lines Transportation Group | Transportation Management (ABF Logistics)      
Acquisitions      
Net cash consideration   5,200us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= arcb_SmartLinesTransportationGroupMember
/ us-gaap_StatementBusinessSegmentsAxis
= arcb_TransportationManagementMember		  
Acquired privately-owned businesses | Emergency & Preventative Maintenance (FleetNet)      
Acquisitions      
Net cash consideration     $ 2,600us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= arcb_AcquiredPrivatelyOwnedBusinessesMember
/ us-gaap_StatementBusinessSegmentsAxis
= arcb_EmergencyAndPreventativeMaintenanceMember