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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
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Mar. 31, 2015 | Jan. 02, 2015 | Apr. 30, 2014
Acquisitions |  |  |
Net cash consideration | $ 5,170 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |
Smart Lines Transportation Group | Transportation Management (ABF Logistics) |  |  |
Acquisitions |  |  |
Net cash consideration |  | 5,200 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = arcb_SmartLinesTransportationGroupMember / us-gaap_StatementBusinessSegmentsAxis = arcb_TransportationManagementMember |
Acquired privately-owned businesses | Emergency & Preventative Maintenance (FleetNet) |  |  |
Acquisitions |  |  |
Net cash consideration |  |  | $ 2,600 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = arcb_AcquiredPrivatelyOwnedBusinessesMember / us-gaap_StatementBusinessSegmentsAxis = arcb_EmergencyAndPreventativeMaintenanceMember

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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