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GOODWILL AND INTANGIBLE ASSETS (Details 2) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Finite-lived intangible assets |  |  |
Weighted Average Amortization Period | 13 years |  |
Cost | $ 49,674,000 us-gaap_FiniteLivedIntangibleAssetsGross |  | $ 48,474,000 us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization | 11,934,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | 10,787,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net Value | 37,740,000 us-gaap_FiniteLivedIntangibleAssetsNet |  | 37,687,000 us-gaap_FiniteLivedIntangibleAssetsNet
Indefinite-lived intangible assets |  |  |
Net Value | 35,122,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |  | 35,122,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Total intangible assets |  |  |
Cost | 84,796,000 arcb_FiniteAndIndefiniteLivedIntangibleAssetsGross |  | 83,596,000 arcb_FiniteAndIndefiniteLivedIntangibleAssetsGross
Net Value | 72,862,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 72,809,000 us-gaap_IntangibleAssetsNetExcludingGoodwill
Amortization expense on intangible assets |  |  |
Intangible amortization expense | 1,148,000 us-gaap_AmortizationOfIntangibleAssets | 1,043,000 us-gaap_AmortizationOfIntangibleAssets |
Minimum |  |  |
Amortization expense on intangible assets |  |  |
Annual amortization expense on intangible assets expected for the full years 2015 through 2019 | 3,000,000 arcb_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 | 4,000,000 arcb_FiniteLivedIntangibleAssetsAnnualAmortizationNextFiveFiscalYears / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Trade name |  |  |
Indefinite-lived intangible assets |  |  |
Net Value | 32,300,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  | 32,300,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Other |  |  |
Indefinite-lived intangible assets |  |  |
Net Value | 2,822,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  | 2,822,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Customer relationships |  |  |
Finite-lived intangible assets |  |  |
Weighted Average Amortization Period | 14 years |  |
Cost | 45,442,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 44,242,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated Amortization | 8,813,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 7,971,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Net Value | 36,629,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 36,271,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Driver network |  |  |
Finite-lived intangible assets |  |  |
Weighted Average Amortization Period | 3 years |  |
Cost | 3,200,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = arcb_DriverNetworkMember |  | 3,200,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = arcb_DriverNetworkMember
Accumulated Amortization | 2,978,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = arcb_DriverNetworkMember |  | 2,711,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = arcb_DriverNetworkMember
Net Value | 222,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = arcb_DriverNetworkMember |  | 489,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = arcb_DriverNetworkMember
Other |  |  |
Finite-lived intangible assets |  |  |
Weighted Average Amortization Period | 8 years |  |
Cost | 1,032,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  | 1,032,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Accumulated Amortization | 143,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  | 105,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Net Value | $ 889,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  | $ 927,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember

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- Definition 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. + References No definition available. + Details
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