XML 28 R30.htm IDEA: XBRL DOCUMENT v3.3.0.814

ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION (Acq) (Details) - USD ($) $ in Thousands			9 Months Ended
	Jan. 02, 2015	Apr. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Acquisitions
Net cash consideration			$ 5,239	$ 2,647
Smart Lines Transportation Group | Transportation Management (ABF Logistics)
Acquisitions
Net cash consideration	$ 5,200
Acquired privately-owned businesses | Emergency & Preventative Maintenance (FleetNet)
Acquisitions
Net cash consideration		$ 2,600

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 230



-SubTopic 10



-Section 45



-Paragraph 13



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585



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



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Investing Activities



-URI http://asc.fasb.org/extlink&oid=6516133

+ Details

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

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=arcb_SmartLinesTransportationGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=arcb_TransportationManagementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=arcb_AcquiredPrivatelyOwnedBusinessesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=arcb_EmergencyAndPreventativeMaintenanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: