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LEGAL PROCEEDINGS, ENVIRONMENTAL MATTERS, AND OTHER EVENTS (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 state tank | Dec. 31, 2014
Underground fuel storage tanks |  |
Environmental Matters |  |
Number of underground tanks where the company's subsidiaries store fuel for use in tractors and trucks | 63 arcb_UndergroundFuelStorageTanksNumber / us-gaap_EnvironmentalRemediationContingencyAxis = arcb_UndergroundFuelStorageTanksMember |
Number of states in which underground tanks are located | 19 arcb_UndergroundFuelStorageTanksLocationsNumberOfStates / us-gaap_EnvironmentalRemediationContingencyAxis = arcb_UndergroundFuelStorageTanksMember |
Clean Water Act | Freight Transportation (ABF Freight) |  |
Environmental Matters |  |
Reserve for environmental contingencies | 0 us-gaap_AccruedEnvironmentalLossContingenciesCurrent / us-gaap_EnvironmentalRemediationContingencyAxis = arcb_CleanWaterActLitigationMember / us-gaap_StatementBusinessSegmentsAxis = arcb_FreightTransportationMember |
Environmental cleanup costs |  |
Environmental Matters |  |
Reserve for environmental contingencies | 0.9 us-gaap_AccruedEnvironmentalLossContingenciesCurrent / us-gaap_EnvironmentalRemediationContingencyAxis = arcb_EnvironmentalCleanupCostsMember | $ 0.8 us-gaap_AccruedEnvironmentalLossContingenciesCurrent / us-gaap_EnvironmentalRemediationContingencyAxis = arcb_EnvironmentalCleanupCostsMember

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