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ACCOUNTING POLICIES - Allowances (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Allowances |  |
Allowance for credit losses on trade accounts receivable | $ 8.8 | $ 3.6
Increase in amount of allowance for credit losses, including allowance assumed in business acquisition | 8.0 |
Amount of allowance for credit losses assumed in acquisition | 6.5 |
Write-offs, net of recoveries | $ 2.8 |

X
- Definition Amount of direct write-downs of accounts receivable charged against the allowance net of recovery. + References No definition available. + Details
Name: | arcb_AccountsReceivableAllowanceForCreditLossWriteoffNetOfRecovery
Namespace Prefix: | arcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase (decrease) in amount of allowance for credit losses, including allowance assumed in business acquisition. + References No definition available. + Details
Name: | arcb_AllowanceForCreditLossesIncludingBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAllowanceForCreditLossesIncreaseDecrease
Namespace Prefix: | arcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of allowance for credit losses assumed in business combination. + References No definition available. + Details
Name: | arcb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAllowanceForCreditLosses
Namespace Prefix: | arcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant