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GOODWILL AND INTANGIBLE ASSETS (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-lived intangible assets
Weighted Average Amortization Period	13 years
Cost	$ 48,474,000us-gaap_FiniteLivedIntangibleAssetsGross	$ 46,700,000us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization	10,787,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	6,435,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net Value	37,687,000us-gaap_FiniteLivedIntangibleAssetsNet	40,265,000us-gaap_FiniteLivedIntangibleAssetsNet
Indefinite-lived intangible assets
Net Value	35,122,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill	35,122,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Total intangible assets
Cost	83,596,000arcb_FiniteAndIndefiniteLivedIntangibleAssetsGross	81,822,000arcb_FiniteAndIndefiniteLivedIntangibleAssetsGross
Net Value	72,809,000us-gaap_IntangibleAssetsNetExcludingGoodwill	75,387,000us-gaap_IntangibleAssetsNetExcludingGoodwill
Amortization expense on intangible assets
Intangible amortization expense	4,352,000us-gaap_AmortizationOfIntangibleAssets	4,174,000us-gaap_AmortizationOfIntangibleAssets	2,261,000us-gaap_AmortizationOfIntangibleAssets
Impairment of indefinite-lived intangible assets	0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Minimum
Amortization expense on intangible assets
Annual amortization expense on intangible assets expected for the full years 2015 through 2019	3,000,000arcb_FiniteLivedIntangibleAssetsAnnualAmortizationNextFiveFiscalYears / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum
Amortization expense on intangible assets
Annual amortization expense on intangible assets expected for the full years 2015 through 2019	4,000,000arcb_FiniteLivedIntangibleAssetsAnnualAmortizationNextFiveFiscalYears / us-gaap_RangeAxis = us-gaap_MaximumMember
Trade name
Indefinite-lived intangible assets
Net Value	32,300,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember	32,300,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Other
Indefinite-lived intangible assets
Net Value	2,822,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember	2,822,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Customer relationships
Finite-lived intangible assets
Weighted Average Amortization Period	14 years
Cost	44,242,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	43,500,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated Amortization	7,971,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	4,790,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Net Value	36,271,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	38,710,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Driver network
Finite-lived intangible assets
Weighted Average Amortization Period	3 years
Cost	3,200,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = arcb_DriverNetworkMember	3,200,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = arcb_DriverNetworkMember
Accumulated Amortization	2,711,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = arcb_DriverNetworkMember	1,645,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = arcb_DriverNetworkMember
Net Value	489,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = arcb_DriverNetworkMember	1,555,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = arcb_DriverNetworkMember
Other
Finite-lived intangible assets
Weighted Average Amortization Period	8 years
Cost	1,032,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Accumulated Amortization	105,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Net Value	$ 927,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember

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- Definition

Sum of the gross carrying amounts before accumulated amortization or impairments, if any, as of the balance sheet date of all intangible assets.

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The amount of amortization expense expected to be recognized annually for the next five fiscal years following the latest fiscal year, for intangible assets subject to amortization.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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