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GOODWILL AND INTANGIBLE ASSETS (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | May 31, 2013 | Apr. 30, 2014
Goodwill by reportable operating segment |  |  |  |
Balance at the beginning of the period | $ 76,448,000 us-gaap_Goodwill | $ 73,189,000 us-gaap_Goodwill |  |
Purchase accounting adjustments |  | 1,567,000 us-gaap_GoodwillPurchaseAccountingAdjustments |  |
Goodwill acquired | 630,000 us-gaap_GoodwillAcquiredDuringPeriod | 1,692,000 us-gaap_GoodwillAcquiredDuringPeriod |  |
Balance at the end of the period | 77,078,000 us-gaap_Goodwill | 76,448,000 us-gaap_Goodwill |  |
Impairment of goodwill balances | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss |  |
Household Goods Moving Services (ABF Moving) |  |  |  |
Goodwill by reportable operating segment |  |  |  |
Balance at the beginning of the period |  | 3,660,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = arcb_HouseholdGoodsMovingServicesMember |  |
Goodwill acquired |  | 1,692,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = arcb_HouseholdGoodsMovingServicesMember |  |
Balance at the end of the period | 5,352,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = arcb_HouseholdGoodsMovingServicesMember | 5,352,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = arcb_HouseholdGoodsMovingServicesMember |  |
Goodwill related to acquisition expected to be fully tax deductible |  |  | 1,700,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_StatementBusinessSegmentsAxis = arcb_HouseholdGoodsMovingServicesMember |
Premium Logistics (Panther) |  |  |  |
Goodwill by reportable operating segment |  |  |  |
Balance at the beginning of the period |  | 69,529,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = arcb_PremiumLogisticsMember |  |
Purchase accounting adjustments |  | 1,567,000 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = arcb_PremiumLogisticsMember |  |
Balance at the end of the period | 71,096,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = arcb_PremiumLogisticsMember | 71,096,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = arcb_PremiumLogisticsMember |  |
Emergency & Preventative Maintenance (FleetNet) |  |  |  |
Goodwill by reportable operating segment |  |  |  |
Goodwill acquired | 630,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = arcb_EmergencyAndPreventativeMaintenanceMember |  |  |
Balance at the end of the period | 630,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = arcb_EmergencyAndPreventativeMaintenanceMember |  |  |
Goodwill related to acquisition expected to be fully tax deductible |  |  |  | $ 600,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_StatementBusinessSegmentsAxis = arcb_EmergencyAndPreventativeMaintenanceMember

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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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