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STOCKHOLDERS' EQUITY (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Unrecognized net periodic benefit costs:    
INCOME (LOSS) BEFORE INCOME TAXES $ 912us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest $ (8,955)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Tax benefit (167)us-gaap_IncomeTaxExpenseBenefit 3,762us-gaap_IncomeTaxExpenseBenefit
NET INCOME (LOSS) 745us-gaap_NetIncomeLoss (5,193)us-gaap_NetIncomeLoss
Unrecognized Net Periodic Benefit Costs | Amounts Reclassified from Accumulated Other Comprehensive Loss    
Unrecognized net periodic benefit costs:    
Amortization of net actuarial loss (1,074)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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(577)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
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Amortization of prior service credit 47us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
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47us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
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Pension settlement expense (1,119)arcb_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociPensionAndOtherPostretirementBenefitPlansSettlementGainExpenseBeforeTax
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(3,691)arcb_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociPensionAndOtherPostretirementBenefitPlansSettlementGainExpenseBeforeTax
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INCOME (LOSS) BEFORE INCOME TAXES (2,146)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
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(4,221)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
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Tax benefit 835us-gaap_IncomeTaxExpenseBenefit
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1,642us-gaap_IncomeTaxExpenseBenefit
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NET INCOME (LOSS) $ (1,311)us-gaap_NetIncomeLoss
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$ (2,579)us-gaap_NetIncomeLoss
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