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INCOME TAXES (Details 3) (USD $) | 3 Months Ended | 12 Months Ended
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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 |  |  |  |  |  |  |  |  | $ 24,714,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 6,811,000 us-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 | 352,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Nondeductible expenses |  |  |  |  |  |  |  |  | 1,239,000 us-gaap_IncomeTaxReconciliationNondeductibleExpense | 1,090,000 us-gaap_IncomeTaxReconciliationNondeductibleExpense | 1,415,000 us-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) |  |  |  |  |  |  |  |  | 19,638,000 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | 2,402,000 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | (8,656,000)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State income tax provision (benefit) |  |  |  |  |  |  |  |  | 3,389,000 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations | 1,026,000 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations | (1,005,000)us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Foreign income tax provision |  |  |  |  |  |  |  |  | 1,408,000 us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations | 222,000 us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations | 401,000 us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
Total provision (benefit) for income taxes | 5,097,000 us-gaap_IncomeTaxExpenseBenefit | 12,938,000 us-gaap_IncomeTaxExpenseBenefit | 10,163,000 us-gaap_IncomeTaxExpenseBenefit | (3,762,000)us-gaap_IncomeTaxExpenseBenefit | 3,549,000 us-gaap_IncomeTaxExpenseBenefit | 7,022,000 us-gaap_IncomeTaxExpenseBenefit | 2,987,000 us-gaap_IncomeTaxExpenseBenefit | (9,908,000)us-gaap_IncomeTaxExpenseBenefit | 24,435,000 us-gaap_IncomeTaxExpenseBenefit | 3,650,000 us-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 |  |  |  |  |  |  |  |  | 40,400,000 us-gaap_IncomeTaxesPaid | 13,400,000 us-gaap_IncomeTaxesPaid | 5,300,000 us-gaap_IncomeTaxesPaid
Income tax refunds |  |  |  |  |  |  |  |  | 11,900,000 us-gaap_ProceedsFromIncomeTaxRefunds | 8,100,000 us-gaap_ProceedsFromIncomeTaxRefunds | 7,100,000 us-gaap_ProceedsFromIncomeTaxRefunds
Tax benefit of options exercised and dividends on share-based payment awards |  |  |  |  |  |  |  |  | $ 100,000 arcb_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptionsAndDividendsOnShareBasedPaymentAwards | $ 200,000 arcb_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptionsAndDividendsOnShareBasedPaymentAwards |

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- Definition The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to life insurance proceeds and changes in cash surrender value. + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the alternative fuel tax credit. + References No definition available. + Details
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- Definition Amount of current and deferred federal income tax expense (benefit) attributable to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition Amount of current and deferred foreign income tax expense (benefit) attributable to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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