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INCOME TAXES (Details 3) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation between the effective income tax rate, as computed on loss before income taxes, and the statutory federal income tax rate                      
Income tax provision (benefit) at the statutory federal rate                 $ 24,714,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 6,811,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (5,947,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Federal income tax effects of:                      
State income taxes                 (1,186,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (359,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 352,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Nondeductible expenses                 1,239,000us-gaap_IncomeTaxReconciliationNondeductibleExpense 1,090,000us-gaap_IncomeTaxReconciliationNondeductibleExpense 1,415,000us-gaap_IncomeTaxReconciliationNondeductibleExpense
Life insurance proceeds and changes in cash surrender value                 (1,329,000)arcb_IncomeTaxReconciliationLifeInsuranceProceedsAndChanges (1,320,000)arcb_IncomeTaxReconciliationLifeInsuranceProceedsAndChanges (752,000)arcb_IncomeTaxReconciliationLifeInsuranceProceedsAndChanges
Dividends received deduction                 (6,000)us-gaap_IncomeTaxReconciliationDeductionsDividends (9,000)us-gaap_IncomeTaxReconciliationDeductionsDividends (5,000)us-gaap_IncomeTaxReconciliationDeductionsDividends
Alternative fuel tax credit                 (1,148,000)arcb_IncomeTaxReconciliationTaxCreditsFuelTax (1,935,000)arcb_IncomeTaxReconciliationTaxCreditsFuelTax  
Decrease in valuation allowances                 (696,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (1,436,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (3,180,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other                 (1,950,000)us-gaap_IncomeTaxReconciliationOtherAdjustments (440,000)us-gaap_IncomeTaxReconciliationOtherAdjustments (539,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Federal income tax provision (benefit)                 19,638,000us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 2,402,000us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations (8,656,000)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State income tax provision (benefit)                 3,389,000us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 1,026,000us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations (1,005,000)us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Foreign income tax provision                 1,408,000us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations 222,000us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations 401,000us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
Total provision (benefit) for income taxes 5,097,000us-gaap_IncomeTaxExpenseBenefit 12,938,000us-gaap_IncomeTaxExpenseBenefit 10,163,000us-gaap_IncomeTaxExpenseBenefit (3,762,000)us-gaap_IncomeTaxExpenseBenefit 3,549,000us-gaap_IncomeTaxExpenseBenefit 7,022,000us-gaap_IncomeTaxExpenseBenefit 2,987,000us-gaap_IncomeTaxExpenseBenefit (9,908,000)us-gaap_IncomeTaxExpenseBenefit 24,435,000us-gaap_IncomeTaxExpenseBenefit 3,650,000us-gaap_IncomeTaxExpenseBenefit (9,260,000)us-gaap_IncomeTaxExpenseBenefit
Effective tax benefit rate (as a percent)                 34.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 18.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations (54.50%)us-gaap_EffectiveIncomeTaxRateContinuingOperations
Income taxes paid, excluding income tax refunds                 40,400,000us-gaap_IncomeTaxesPaid 13,400,000us-gaap_IncomeTaxesPaid 5,300,000us-gaap_IncomeTaxesPaid
Income tax refunds                 11,900,000us-gaap_ProceedsFromIncomeTaxRefunds 8,100,000us-gaap_ProceedsFromIncomeTaxRefunds 7,100,000us-gaap_ProceedsFromIncomeTaxRefunds
Tax benefit of options exercised and dividends on share-based payment awards                 $ 100,000arcb_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptionsAndDividendsOnShareBasedPaymentAwards $ 200,000arcb_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptionsAndDividendsOnShareBasedPaymentAwards