XML 46 R44.htm IDEA: XBRL DOCUMENT
v2.4.1.9

ACCOUNTING POLICIES (Details 3) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Insurance-Related Assessments |  |
Liabilities for state guaranty fund assessments and other insurance-related assessments | $ 1.2 us-gaap_LossContingencyUndiscountedAmountOfInsuranceRelatedAssessmentLiability | $ 1.0 us-gaap_LossContingencyUndiscountedAmountOfInsuranceRelatedAssessmentLiability
Maximum expected period for payment of state guaranty fund assessments and other insurance-related assessments | 1 year |

X
- Definition The maximum period of time over which the undiscounted amount of the required funding mandated by statute or regulatory authority that is related directly or indirectly to underwriting activities, including pools for self-insurance and excluding premium taxes and income taxes, is expected to be paid. + References No definition available. + Details
Name: | arcb_LossContingencyUndiscountedAmountOfInsuranceRelatedAssessmentLiabilityPaymentPeriodMaximum
Namespace Prefix: | arcb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LossContingencyInsuranceRelatedAssessmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The liability as of the balance sheet date representing required funding mandated by statute or regulatory authority that is related directly or indirectly to underwriting activities, including pools for self-insurance and excluding premium taxes and income taxes. The funds derived from the assessments generally enable a government guarantor to pay insurance claims in the event that the underwriting insurer is insolvent or otherwise unable to meet its payment obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 405 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=9154593&loc=d3e23169-109297 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 405 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392405&loc=d3e24119-109301 + Details
Name: | us-gaap_LossContingencyUndiscountedAmountOfInsuranceRelatedAssessmentLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration