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ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 30, 2014 | May 31, 2013 | Jun. 15, 2012
Acquisitions |  |  |  |  |  |
Net cash consideration | $ 2,647 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 4,146 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 180,039 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |
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 |  |
Acquired privately-owned businesses | Household Goods Moving Services (ABF Moving) |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Net cash consideration |  |  |  |  | 4,100 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = arcb_AcquiredPrivatelyOwnedBusinessesMember / us-gaap_StatementBusinessSegmentsAxis = arcb_HouseholdGoodsMovingServicesMember |
Panther |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Net cash consideration |  |  |  |  |  | $ 180,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = arcb_PantherPremiumLogisticsMember
Percentage of common stock acquired |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = arcb_PantherPremiumLogisticsMember

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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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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