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EMPLOYEE BENEFIT PLANS (Details 6) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Long-Term Cash Incentive Plan
Earning period of Long-term cash incentive plan	3 years
Incentive payments accrued for Long-Term Cash Incentive Plan	$ 7.6arcb_DeferredCompensationCashbasedArrangementsLiabilityNoncurrent	$ 4.2arcb_DeferredCompensationCashbasedArrangementsLiabilityNoncurrent	$ 0arcb_DeferredCompensationCashbasedArrangementsLiabilityNoncurrent
Other Plans
Cash surrender value of life insurance policies	44.5us-gaap_CashSurrenderValueOfLifeInsurance	43.8us-gaap_CashSurrenderValueOfLifeInsurance
Recognized gains associated with changes in the cash surrender value and proceeds from life insurance policies	3.8arcb_LifeInsurancePolicyRecognizedGains	3.8arcb_LifeInsurancePolicyRecognizedGains	2.1arcb_LifeInsurancePolicyRecognizedGains
401(k) Plan
Defined Contribution Plans
Maximum percentage of salary permitted to be deferred by plan participants	69.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContribution401KPlanMember
Rate of employer match on participant contributions	50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContribution401KPlanMember
Maximum percentage of participants compensation that is eligible for 50% matching contribution	6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContribution401KPlanMember
Expense for employer contribution to defined contribution plan	4.9us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContribution401KPlanMember	4.5us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContribution401KPlanMember	3.8us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContribution401KPlanMember
Defined Contribution Plan
Defined Contribution Plans
Expense for employer contribution to defined contribution plan	$ 9.0us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContributionPlanMember	$ 5.9us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContributionPlanMember	$ 0us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanNameAxis = arcb_DefinedContributionPlanMember
Period of service for participants' full vesting in the employer's contributions	3 years

X

- Definition

Amounts that were accrued at the end of the period under the Long-Term Cash Incentive Plan for payment in future periods.

+ References

No definition available.

+ Details

Name:	arcb_DeferredCompensationCashbasedArrangementsLiabilityNoncurrent
Namespace Prefix:	arcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The minimum period that the individual is required to perform services in order to be fully vested under the deferred compensation arrangement.

+ References

No definition available.

+ Details

Name:	arcb_DefinedContributionPlanRequisiteServicePeriod
Namespace Prefix:	arcb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the recognized gains associated with changes in the cash surrender value and proceeds from life insurance policies.

+ References

No definition available.

+ Details

Name:	arcb_LifeInsurancePolicyRecognizedGains
Namespace Prefix:	arcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	arcb_LongTermCashIncentivePlanAbstract
Namespace Prefix:	arcb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the earning period of incentives under the Long-Term Cash Incentive Plan.

+ References

No definition available.

+ Details

Name:	arcb_LongTermCashIncentivePlanEarningPeriod
Namespace Prefix:	arcb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	arcb_OtherPlansAbstract
Namespace Prefix:	arcb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 4

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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