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ACCOUNTING POLICIES (Details) (Minimum)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues | Customer concentration risk      
Concentration of Credit Risk      
Percentage for concentration of credit risk disclosure 5.00%arcb_ThresholdForDisclosurePercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 5.00%arcb_ThresholdForDisclosurePercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 5.00%arcb_ThresholdForDisclosurePercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Accounts receivable | Credit concentration risk      
Concentration of Credit Risk      
Percentage for concentration of credit risk disclosure 5.00%arcb_ThresholdForDisclosurePercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 5.00%arcb_ThresholdForDisclosurePercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember