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INCOME TAXES - Stock Compensation (Details) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
INCOME TAXES |  |  |
Tax benefit for settlement of stock awards (as a percent) | 5.20% | 2.80% | 2.10%

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- Definition Tax expense (benefit) for settlement of stock awards including both federal and state taxes as a percent. + References No definition available. + Details
Name: | arcb_TaxExpenseBenefitSettlementOfStockAwardsPercentage
Namespace Prefix: | arcb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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