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LEASES - Cash flows (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Operating leases |  |
Noncash change in operating right-of-use assets | $ 11,386 | $ 11,002
Change in operating lease liabilities | (10,625) | (11,232)
Operating right-of-use assets and lease liabilities, net | 761 | (230)
Cash paid for amounts included in the measurement of operating lease liabilities | $ (12,446) | $ (11,826)

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- Definition Amount of increase (decrease) in operating lease liability during the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Noncash change in operating right-of-use assets. + References No definition available. + Details
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Namespace Prefix: | arcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The amount of operating right-use-of-assets and lease liabilities, net. + References No definition available. + Details
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Namespace Prefix: | arcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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