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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 | $ 48,474,000 us-gaap_FiniteLivedIntangibleAssetsGross | $ 46,700,000 us-gaap_FiniteLivedIntangibleAssetsGross |
Accumulated Amortization | 10,787,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 6,435,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Net Value | 37,687,000 us-gaap_FiniteLivedIntangibleAssetsNet | 40,265,000 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 | 83,596,000 arcb_FiniteAndIndefiniteLivedIntangibleAssetsGross | 81,822,000 arcb_FiniteAndIndefiniteLivedIntangibleAssetsGross |
Net Value | 72,809,000 us-gaap_IntangibleAssetsNetExcludingGoodwill | 75,387,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |
Amortization expense on intangible assets |  |  |
Intangible amortization expense | 4,352,000 us-gaap_AmortizationOfIntangibleAssets | 4,174,000 us-gaap_AmortizationOfIntangibleAssets | 2,261,000 us-gaap_AmortizationOfIntangibleAssets
Impairment of indefinite-lived intangible assets | 0 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill | 0 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill |
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 | 44,242,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 43,500,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Accumulated Amortization | 7,971,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 4,790,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Net Value | 36,271,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 38,710,000 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 | 2,711,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = arcb_DriverNetworkMember | 1,645,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = arcb_DriverNetworkMember |
Net Value | 489,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = arcb_DriverNetworkMember | 1,555,000 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 |  |
Accumulated Amortization | 105,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  |
Net Value | $ 927,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  |

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