XML 59 R46.htm IDEA: XBRL DOCUMENT
v3.8.0.1

ACCOUNTING POLICIES (Book Overdrafts) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Accounts Payable |  |
Book Overdrafts |  |
Amount of book overdrafts | $ 17.2 | $ 17.7

X
- Definition Carrying value as of the balance sheet date of issued checks that have not cleared the bank. + References No definition available. + Details
Name: | arcb_BookOverdrafts
Namespace Prefix: | arcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | arcb_BookOverdraftsAbstract
Namespace Prefix: | arcb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=arcb_AccountsPayableBalanceSheetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |