XML 25 R57.htm IDEA: XBRL DOCUMENT v2.4.1.9

INCOME TAXES (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Operating loss and contribution carryforwards
Net decrease in valuation allowance	$ 3.2us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
State
Operating loss and contribution carryforwards
Operating loss carryforwards		31.6us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Contribution carryforwards		0.9arcb_ContributionCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Majority of state net operating loss and contribution carryforwards, expiration period one		15 years
Majority of state net operating loss and contribution carryforwards, expiration period two		20 years
State | Minimum
Operating loss and contribution carryforwards
State net operating loss and contribution carryforwards expiration period		5 years
State | Maximum
Operating loss and contribution carryforwards
State net operating loss and contribution carryforwards expiration period		20 years
State | Panther
Operating loss and contribution carryforwards
Operating loss carryforwards		10.6us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / dei_LegalEntityAxis = arcb_PantherPremiumLogisticsMember
State | Panther | Minimum
Operating loss and contribution carryforwards
Net operating loss carryforwards expiration period		5 years
State | Panther | Maximum
Operating loss and contribution carryforwards
Net operating loss carryforwards expiration period		20 years
Foreign
Operating loss and contribution carryforwards
Valuation allowance related to net operating loss carryforwards		0.3us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Federal | Panther
Operating loss and contribution carryforwards
Operating loss carryforwards		2.1us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / dei_LegalEntityAxis = arcb_PantherPremiumLogisticsMember
Net operating loss carryforwards expiration period		17 years
Certain state net operating losses and state deferred tax assets
Operating loss and contribution carryforwards
Net decrease in valuation allowance			1.5us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = arcb_StateOperatingLossesandDeferredTaxAssetsMember
Deferred tax assets related to the nonunion defined benefit pension plan
Operating loss and contribution carryforwards
Net decrease in valuation allowance	$ 4.0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = arcb_DeferredTaxAssetsForNonunionDefinedBenefitPensionPlanMember

X

- Definition

Represents the contribution carryovers before tax effects available to reduce future taxable income under enacted tax laws.

+ References

No definition available.

+ Details

Name:	arcb_ContributionCarryforwards
Namespace Prefix:	arcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the expiration period of net operating loss and contribution carryovers.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the first of two expiration periods that apply to the majority of net operating loss and contribution carryovers.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the second of two expiration periods that apply to the majority of net operating loss and contribution carryovers.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the expiration period of net operating loss carryovers.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

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

X

- Definition

The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 30

-Paragraph 5

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=6907311&loc=d3e30536-109315

+ Details

Name:	us-gaap_OperatingLossCarryforwardsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 45

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318

+ Details

Name:	us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_DomesticCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_ForeignCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ValuationAllowanceByDeferredTaxAssetAxis=arcb_DeferredTaxAssetsForNonunionDefinedBenefitPensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ValuationAllowanceByDeferredTaxAssetAxis=arcb_StateOperatingLossesandDeferredTaxAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: