$ARCB
ARCBEST CORP /DE/ Stock $arcb

$arcb Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000155837021002023 Filed on February 26, 2021

Income Statement

Concept	2020 Q4	2019 Q4	2019 Q3
Revenue	$816.4M	$717.4M	$787.6M
YoY Change	13.8%	-7.34%	-4.67%
Cost Of Revenue	$187.4M	$168.1M	$180.2M
YoY Change	11.48%	-5.08%	-3.12%
Gross Profit	$629.0M	$549.3M	$607.3M
YoY Change	14.51%	-8.01%	-5.12%
Gross Profit Margin	77.04%	76.57%	77.11%
Selling, General & Admin	$514.9M	$459.9M	$491.3M
YoY Change	11.96%	-0.24%	1.84%
% of Gross Profit	81.86%	83.72%	80.9%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$30.30M	$29.10M	$29.36M
YoY Change	4.12%	8.18%	4.76%
% of Gross Profit	4.82%	5.3%	4.83%
Operating Expenses	$598.9M	$538.2M	$576.3M
YoY Change	11.28%	-3.81%	-1.69%
Operating Profit	$30.25M	-$11.23M	$31.21M
YoY Change	-369.41%	-130.22%	-44.33%
Interest Expense	-$2.000M	-$1.300M	-$1.100M
YoY Change	53.85%	-7.14%	-21.43%
% of Operating Profit	-6.61%		-3.52%
Other Income/Expense, Net	$2.000M	$500.0K	-$6.734M
YoY Change	300.0%	-103.31%	843.14%
Pretax Income	$30.20M	-$12.00M	$23.34M
YoY Change	-351.67%	-157.97%	-56.77%
Income Tax	$6.285M	-$6.478M	$7.072M
% Of Pretax Income	20.81%		30.3%
Net Earnings	$23.91M	-$5.549M	$16.27M
YoY Change	-530.96%	-136.27%	-60.1%
Net Earnings / Revenue	2.93%	-0.77%	2.07%
Basic Earnings Per Share	$0.94	-$0.22	$0.64
Diluted Earnings Per Share	$0.89	-$0.22	$0.62
COMMON SHARES
Basic Shares Outstanding	25.43M	25.49M	25.53M
Diluted Shares Outstanding	26.73M	25.49M	26.42M

Balance Sheet

Concept	2020 Q4	2019 Q4	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$369.4M	$318.5M	$308.1M
YoY Change	15.98%	7.24%	21.63%
Cash & Equivalents	$304.0M	$201.9M	$183.8M
Short-Term Investments	$65.40M	$116.6M	$124.3M
Other Short-Term Assets	$4.422M	$4.745M	$5.285M
YoY Change	-6.81%	-47.32%	-85.72%
Inventory
Prepaid Expenses	$37.77M	$30.38M	$25.37M
Receivables	$320.9M	$282.6M	$292.9M
Other Receivables	$14.34M	$18.77M	$18.12M
Total Short-Term Assets	$758.2M	$664.4M	$658.0M
YoY Change	14.11%	2.34%	4.18%
LONG-TERM ASSETS
Property, Plant & Equipment	$678.7M	$683.6M	$680.1M
YoY Change	-0.72%	8.3%	8.48%
Goodwill	$88.32M	$88.32M	$108.3M
YoY Change	0.0%	-18.46%
Intangibles	$54.98M	$58.83M	$65.58M
YoY Change	-6.55%	-14.67%
Long-Term Investments
YoY Change
Other Assets	$77.50M	$79.87M	$85.14M
YoY Change	-2.97%	7.81%	5.37%
Total Long-Term Assets	$1.021B	$986.8M	$1.013B
YoY Change	3.45%	10.88%	14.28%
TOTAL ASSETS
Total Short-Term Assets	$758.2M	$664.4M	$658.0M
Total Long-Term Assets	$1.021B	$986.8M	$1.013B
Total Assets	$1.779B	$1.651B	$1.671B
YoY Change	7.74%	7.27%	10.08%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$170.9M	$134.4M	$160.1M
YoY Change	27.18%	-6.55%	3.59%
Accrued Expenses	$246.7M	$232.3M	$234.9M
YoY Change	6.21%	-4.44%	0.76%
Deferred Revenue		$500.0K
YoY Change		0.0%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$67.10M	$57.30M	$50.20M
YoY Change	17.1%	5.91%	-8.06%
Total Short-Term Liabilities	$506.5M	$444.3M	$465.7M
YoY Change	14.02%	-1.56%	2.38%
LONG-TERM LIABILITIES
Long-Term Debt	$217.1M	$266.2M	$248.2M
YoY Change	-18.44%	12.04%	5.17%
Other Long-Term Liabilities	$37.95M	$38.89M	$38.15M
YoY Change	-2.43%	-12.97%	-43.9%
Total Long-Term Liabilities	$37.95M	$38.89M	$38.15M
YoY Change	-2.43%	-12.97%	-87.45%
TOTAL LIABILITIES
Total Short-Term Liabilities	$506.5M	$444.3M	$465.7M
Total Long-Term Liabilities	$37.95M	$38.89M	$38.15M
Total Liabilities	$544.5M	$483.2M	$503.9M
YoY Change	12.69%	-2.59%	-37.99%
SHAREHOLDERS EQUITY
Retained Earnings	$595.9M	$533.2M	$540.8M
YoY Change	11.77%	6.34%
Common Stock	$342.6M	$334.2M	$332.1M
YoY Change	2.52%	2.53%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$828.6M	$763.0M	$763.6M
YoY Change
Total Liabilities & Shareholders Equity	$1.779B	$1.651B	$1.671B
YoY Change	7.74%	7.27%	10.08%

Cashflow Statement

Concept	2020 Q4	2019 Q4	2019 Q3
OPERATING ACTIVITIES
Net Income	$23.91M	-$5.549M	$16.27M
YoY Change	-530.96%	-136.27%	-60.1%
Depreciation, Depletion And Amortization	$30.30M	$29.10M	$29.36M
YoY Change	4.12%	8.18%	4.76%
Cash From Operating Activities	$54.70M	$32.40M	$57.50M
YoY Change	68.83%	-60.34%	6.48%
INVESTING ACTIVITIES
Capital Expenditures	-$27.80M	-$24.10M	-$30.90M
YoY Change	15.35%	225.68%	94.34%
Acquisitions
YoY Change
Other Investing Activities	$22.70M	$16.50M	-$6.100M
YoY Change	37.58%	-156.31%	165.22%
Cash From Investing Activities	-$5.000M	-$7.700M	-$36.90M
YoY Change	-35.06%	-79.02%	101.64%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-13.30M	-6.600M	-18.50M
YoY Change	101.52%	-79.63%	5.11%
NET CHANGE
Cash From Operating Activities	54.70M	32.40M	57.50M
Cash From Investing Activities	-5.000M	-7.700M	-36.90M
Cash From Financing Activities	-13.30M	-6.600M	-18.50M
Net Change In Cash	36.40M	18.10M	2.100M
YoY Change	101.1%	43.65%	-88.4%
FREE CASH FLOW
Cash From Operating Activities	$54.70M	$32.40M	$57.50M
Capital Expenditures	-$27.80M	-$24.10M	-$30.90M
Free Cash Flow	$82.50M	$56.50M	$88.40M
YoY Change	46.02%	-36.59%	26.47%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000894405
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	0-19969
CY2020	dei	Entity Registrant Name EntityRegistrantName	ARCBEST CORPORATION
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	71-0673405
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	8401 McClure Drive
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Fort Smith
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	AR
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	72916
CY2020	dei	City Area Code CityAreaCode	479
CY2020	dei	Local Phone Number LocalPhoneNumber	785-6000
CY2020	dei	Security12b Title Security12bTitle	Common Stock
CY2020	dei	Trading Symbol TradingSymbol	ARCB
CY2020	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q2	dei	Entity Public Float EntityPublicFloat	658708492
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	25397696
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	303954000
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	201909000
CY2020Q4	us-gaap	Short Term Investments ShortTermInvestments	65408000
CY2019Q4	us-gaap	Short Term Investments ShortTermInvestments	116579000
CY2020Q4	arcb	Allowances For Credit Losses And Reserve For Customer Deductions AllowancesForCreditLossesAndReserveForCustomerDeductions	7851000
CY2019Q4	arcb	Allowances For Credit Losses And Reserve For Customer Deductions AllowancesForCreditLossesAndReserveForCustomerDeductions	5448000
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	320870000
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	282579000
CY2020Q4	us-gaap	Allowance For Doubtful Other Receivables Current AllowanceForDoubtfulOtherReceivablesCurrent	660000
CY2019Q4	us-gaap	Allowance For Doubtful Other Receivables Current AllowanceForDoubtfulOtherReceivablesCurrent	476000
CY2020Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	14343000
CY2019Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	18774000
CY2020Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	37774000
CY2019Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	30377000
CY2020Q4	arcb	Prepaid And Income Taxes Receivable Current PrepaidAndIncomeTaxesReceivableCurrent	11397000
CY2019Q4	arcb	Prepaid And Income Taxes Receivable Current PrepaidAndIncomeTaxesReceivableCurrent	9439000
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	4422000
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	4745000
CY2020Q4	us-gaap	Assets Current AssetsCurrent	758168000
CY2019Q4	us-gaap	Assets Current AssetsCurrent	664402000
CY2020Q4	arcb	Land And Structures Gross LandAndStructuresGross	342178000
CY2019Q4	arcb	Land And Structures Gross LandAndStructuresGross	342122000
CY2020Q4	arcb	Revenue Equipment Gross RevenueEquipmentGross	916760000
CY2019Q4	arcb	Revenue Equipment Gross RevenueEquipmentGross	896020000
CY2020Q4	arcb	Service Office And Other Equipment Gross ServiceOfficeAndOtherEquipmentGross	233810000
CY2019Q4	arcb	Service Office And Other Equipment Gross ServiceOfficeAndOtherEquipmentGross	233354000
CY2020Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	163193000
CY2019Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	151068000
CY2020Q4	us-gaap	Leasehold Improvements Gross LeaseholdImprovementsGross	15156000
CY2019Q4	us-gaap	Leasehold Improvements Gross LeaseholdImprovementsGross	10383000
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1671097000
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1632947000
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	992407000
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	949355000
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	678690000
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	683592000
CY2020Q4	us-gaap	Goodwill Goodwill	88320000
CY2019Q4	us-gaap	Goodwill Goodwill	88320000
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	54981000
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	58832000
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	115195000
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	68470000
CY2020Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	6158000
CY2019Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	7725000
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	77496000
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	79866000
CY2020Q4	us-gaap	Assets Assets	1779008000
CY2019Q4	us-gaap	Assets Assets	1651207000
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CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	134374000
CY2020Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	316000
CY2019Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	12000
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	246746000
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	232321000
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	67105000
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	57305000
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	21482000
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	20265000
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	506547000
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	444277000
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	217119000
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	266214000
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	97839000
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	52277000
CY2020Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	18555000
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	20294000
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	37948000
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	38892000
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	72407000
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	66210000
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	70000000
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	70000000
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CY2020Q4	us-gaap	Common Stock Value CommonStockValue	290000
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	288000
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CY2019Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	333943000
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CY2019Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	3404639
CY2020Q4	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	111173000
CY2019Q4	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	104578000
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	1190000
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	203000
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	828593000
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	763043000
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1779008000
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1651207000
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2940163000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2988310000
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3093788000
CY2020	us-gaap	Costs And Expenses CostsAndExpenses	2841885000
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	2924540000
CY2018	us-gaap	Costs And Expenses CostsAndExpenses	2984690000
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	98278000
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	63770000
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	109098000
CY2020	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	3616000
CY2019	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	6453000
CY2018	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	3914000
CY2020	us-gaap	Interest And Debt Expense InterestAndDebtExpense	11697000
CY2019	us-gaap	Interest And Debt Expense InterestAndDebtExpense	11467000
CY2018	us-gaap	Interest And Debt Expense InterestAndDebtExpense	9468000
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2299000
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CY2020	arcb	Nonoperating Income Expense And Interest And Debt Expense NonoperatingIncomeExpenseAndInterestAndDebtExpense	-5782000
CY2019	arcb	Nonoperating Income Expense And Interest And Debt Expense NonoperatingIncomeExpenseAndInterestAndDebtExpense	-12299000
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CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	92496000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	51471000
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	84386000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21396000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11486000
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17124000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	71100000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	39985000
CY2018	us-gaap	Net Income Loss NetIncomeLoss	67262000
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.80
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.56
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.61
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.69
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.51
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.51
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25410232
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25535529
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25679736
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26422523
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26450055
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CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.32
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.32
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.32
CY2020	us-gaap	Net Income Loss NetIncomeLoss	71100000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	39985000
CY2018	us-gaap	Net Income Loss NetIncomeLoss	67262000
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CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	2308000
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-477000
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	1480000
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	6657000
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-1376000
CY2020	arcb	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Settlements Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationSettlementsTax	23000
CY2019	arcb	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Settlements Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationSettlementsTax	1167000
CY2018	arcb	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Settlements Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationSettlementsTax	3327000
CY2020	arcb	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Settlements Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationSettlementsNetOfTax	66000
CY2019	arcb	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Settlements Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationSettlementsNetOfTax	7338000
CY2018	arcb	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Settlements Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationSettlementsNetOfTax	9598000
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	-152000
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	314000
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	740000
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	437000
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-931000
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-2204000
CY2020	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-1000
CY2019	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-25000
CY2018	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-69000
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-277000
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-357000
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	84000
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-782000
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-1007000
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	236000
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	232000
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	194000
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	-241000
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	661000
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	547000
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-681000
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	987000
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	14441000
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	9912000
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	72087000
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	54426000
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	77174000
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	651462000
CY2018	us-gaap	Net Income Loss NetIncomeLoss	67262000
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	9912000
CY2018	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	2135000
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	8413000
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	9404000
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	8244000
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	717682000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	39985000
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	14441000
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	1291000
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	9523000
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	9110000
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	8187000
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	763043000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	71100000
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	987000
CY2020	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	2065000
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	10478000
CY2020	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	6595000
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	8157000
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	828593000
CY2020	us-gaap	Profit Loss ProfitLoss	71100000
CY2019	us-gaap	Profit Loss ProfitLoss	39985000
CY2018	us-gaap	Profit Loss ProfitLoss	67262000
CY2020	us-gaap	Depreciation Depreciation	114379000
CY2019	us-gaap	Depreciation Depreciation	108099000
CY2018	us-gaap	Depreciation Depreciation	104114000
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4012000
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4367000
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4521000
CY2020	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	-89000
CY2019	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	-8505000
CY2018	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	-12925000
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	10478000
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	9523000
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	8413000
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	4327000
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1223000
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	2336000
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7715000
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	5411000
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1872000
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	26514000
CY2020	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	2376000
CY2019	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	5247000
CY2018	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	59000
CY2018	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	1945000
CY2020	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	38129000
CY2019	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-13720000
CY2018	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	23554000
CY2020	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	7966000
CY2019	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	4756000
CY2018	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	2988000
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-2646000
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1365000
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	4341000
CY2020	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-1712000
CY2019	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-8720000
CY2018	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	12169000
CY2020	arcb	Increase Decrease In Operating Right Of Use Assets And Lease Liabilities Net IncreaseDecreaseInOperatingRightOfUseAssetsAndLeaseLiabilitiesNet	-756000
CY2019	arcb	Increase Decrease In Operating Right Of Use Assets And Lease Liabilities Net IncreaseDecreaseInOperatingRightOfUseAssetsAndLeaseLiabilitiesNet	-728000
CY2020	arcb	Increase Decrease In Multiemployer Pension Fund Withdrawal Liability IncreaseDecreaseInMultiemployerPensionFundWithdrawalLiability	-611000
CY2019	arcb	Increase Decrease In Multiemployer Pension Fund Withdrawal Liability IncreaseDecreaseInMultiemployerPensionFundWithdrawalLiability	-584000
CY2018	arcb	Increase Decrease In Multiemployer Pension Fund Withdrawal Liability IncreaseDecreaseInMultiemployerPensionFundWithdrawalLiability	22602000
CY2020	arcb	Increase Decrease In Accounts Payable Accrued Expenses And Other Liabilities IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities	41281000
CY2019	arcb	Increase Decrease In Accounts Payable Accrued Expenses And Other Liabilities IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities	-27039000
CY2018	arcb	Increase Decrease In Accounts Payable Accrued Expenses And Other Liabilities IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities	52020000
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	205989000
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	170364000
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	255347000
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	43248000
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	90955000
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	43992000
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	13348000
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	13490000
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	4256000
CY2018	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	4680000
CY2020	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	165133000
CY2019	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	129709000
CY2018	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	108495000
CY2020	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	216735000
CY2019	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	120409000
CY2018	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	58698000
CY2020	us-gaap	Payments To Develop Software PaymentsToDevelopSoftware	14241000
CY2019	us-gaap	Payments To Develop Software PaymentsToDevelopSoftware	11476000
CY2018	us-gaap	Payments To Develop Software PaymentsToDevelopSoftware	10097000
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	7461000
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-98241000
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-94950000
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	180000000
CY2020	us-gaap	Proceeds From Accounts Receivable Securitization ProceedsFromAccountsReceivableSecuritization	45000000
CY2019	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	20410000
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	326098000
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	58938000
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	71260000
CY2020	us-gaap	Increase Decrease In Book Overdrafts IncreaseDecreaseInBookOverdrafts	6510000
CY2019	us-gaap	Increase Decrease In Book Overdrafts IncreaseDecreaseInBookOverdrafts	-2722000
CY2018	us-gaap	Increase Decrease In Book Overdrafts IncreaseDecreaseInBookOverdrafts	262000
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	562000
CY2018	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	202000
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	8157000
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	8187000
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	8244000
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	6595000
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	9110000
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	9404000
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2065000
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1291000
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2135000
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-111405000
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-60400000
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-90983000
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	102045000
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	11723000
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	69414000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	201909000
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	190186000
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	120772000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	303954000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	201909000
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	190186000
CY2020	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	61803000
CY2019	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	70372000
CY2018	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	94016000
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	1667000
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	234000
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	2807000
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	67819000
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	32761000
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt;"><b style="font-weight:bold;">Use of Estimates:</b> The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual amounts may differ from those estimates.</p><p style="font-family:'Times New Roman','Times','serif';font-size:12pt;text-align:justify;margin:0pt;"><span style="font-size:10pt;visibility:hidden;"></span></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt;"><b style="font-weight:bold;">Reclassifications: </b>Certain reclassifications have been made to the prior period presentation of accrued expenses in the consolidated balance sheets to conform to the current year presentation. Current portion of pension and postretirement liabilities previously presented in a separate line in the consolidated balance sheets have been reclassed to accrued expenses. There was no impact on total current liabilities as a result of the reclassification. </p><p style="font-family:'Times New Roman','Times','serif';font-size:12pt;text-align:justify;margin:0pt;"><span style="font-size:10pt;visibility:hidden;"></span></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt;"><b style="font-weight:bold;">Subsequent Events</b></p><p style="font-family:'Times New Roman','Times','serif';font-size:12pt;text-align:justify;margin:0pt;"><span style="font-size:10pt;visibility:hidden;"></span></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt;">In January 2021, the Asset-Based segment sold an unutilized property that will result in a gain on sale of property and equipment of approximately $8.5 million.</p><p style="font-family:'Times New Roman','Times','serif';font-size:12pt;text-align:justify;margin:0pt;"><span style="font-size:10pt;visibility:hidden;"></span></p>
CY2020	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt;"><b style="font-weight:bold;">Concentration of Credit Risk:</b> The Company is potentially subject to concentrations of credit risk related to the portion of its cash, cash equivalents, and short-term investments which is not federally insured, as further discussed in Note C.</p><p style="font-family:'Times New Roman','Times','serif';font-size:12pt;text-align:justify;margin:0pt;"><span style="font-size:10pt;visibility:hidden;"></span></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt;">The Company’s services are provided primarily to customers throughout the United States and, to a lesser extent, Canada, Mexico, and other international locations. On a consolidated basis, the Company had no single customer representing more than 4% of its revenues in 2020, 2019, or 2018 or more than 6% of its accounts receivable balance at December 31, 2020 and 2019. The Company performs ongoing credit evaluations of its customers and generally does not require collateral. Historically, credit losses have been within management’s expectations.</p>
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3600000
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1800000
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	4300000
CY2020	arcb	Accounts Receivable Allowance For Credit Loss Writeoff Net Of Recovery AccountsReceivableAllowanceForCreditLossWriteoffNetOfRecovery	2500000
CY2019	arcb	Impairment Of Long Lived Assets Held For Use And Intangible Assets ImpairmentOfLongLivedAssetsHeldForUseAndIntangibleAssets	6500000
CY2020	us-gaap	Revenue Practical Expedient Incremental Cost Of Obtaining Contract RevenuePracticalExpedientIncrementalCostOfObtainingContract	true
CY2020	us-gaap	Revenue Practical Expedient Remaining Performance Obligation RevenuePracticalExpedientRemainingPerformanceObligation	true
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	303954000
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	201909000
CY2020Q4	us-gaap	Short Term Investments ShortTermInvestments	65408000
CY2019Q4	us-gaap	Short Term Investments ShortTermInvestments	116579000
CY2020Q4	arcb	Deposits Uninsured Amount DepositsUninsuredAmount	156400000
CY2019Q4	arcb	Deposits Uninsured Amount DepositsUninsuredAmount	66200000
CY2018Q4	us-gaap	Goodwill Goodwill	108320000
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	20000000
CY2020Q4	us-gaap	Goodwill Goodwill	88320000
CY2020Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	20000000
CY2020Q4	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	20000000.0
CY2020	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P14Y
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	53701000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	31020000
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	27483000
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	58832000
CY2020Q4	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	0
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	9750000
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3267000
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1813000
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3264000
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	413000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	22681000
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	54015000
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	27483000
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	26532000
CY2020Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	86001000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	31020000
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	54981000
CY2019Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	86315000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	3838000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	3815000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	3722000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	3689000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	3674000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	3943000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	22681000
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Change In Tax Rate Deferred Tax Liability Income Tax Benefit TaxCutsAndJobsActOf2017ChangeInTaxRateDeferredTaxLiabilityIncomeTaxBenefit	3800000
CY2018	arcb	Tax Cuts And Jobs Act Of2017 Income Tax Expense Benefit Fiscal Year Tax Filing TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefitFiscalYearTaxFiling	-100000
CY2018Q1	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.3274
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	10001000
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2202000
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	2060000
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	2238000
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	13681000
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	6075000
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	15252000
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	5948000
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	4196000
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	1157000
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1789000
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1221000
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	737000
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-22000
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-6000
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-22000
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7715000
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	5411000
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1872000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21396000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11486000
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17124000
CY2020	arcb	Deferred Income Tax Expense Benefit Property Plant And Equipment And Other Long Lived Assets DeferredIncomeTaxExpenseBenefitPropertyPlantAndEquipmentAndOtherLongLivedAssets	4975000
CY2019	arcb	Deferred Income Tax Expense Benefit Property Plant And Equipment And Other Long Lived Assets DeferredIncomeTaxExpenseBenefitPropertyPlantAndEquipmentAndOtherLongLivedAssets	16255000
CY2018	arcb	Deferred Income Tax Expense Benefit Property Plant And Equipment And Other Long Lived Assets DeferredIncomeTaxExpenseBenefitPropertyPlantAndEquipmentAndOtherLongLivedAssets	23153000
CY2020	arcb	Deferred Income Tax Expense Benefit Amortization Of Intangible Assets And Impairment DeferredIncomeTaxExpenseBenefitAmortizationOfIntangibleAssetsAndImpairment	183000
CY2019	arcb	Deferred Income Tax Expense Benefit Amortization Of Intangible Assets And Impairment DeferredIncomeTaxExpenseBenefitAmortizationOfIntangibleAssetsAndImpairment	-6933000
CY2018	arcb	Deferred Income Tax Expense Benefit Amortization Of Intangible Assets And Impairment DeferredIncomeTaxExpenseBenefitAmortizationOfIntangibleAssetsAndImpairment	-763000
CY2020	arcb	Deferred Income Tax Expense Benefit Reserves For Worker Compensation And Cargo Claims DeferredIncomeTaxExpenseBenefitReservesForWorkerCompensationAndCargoClaims	-182000
CY2019	arcb	Deferred Income Tax Expense Benefit Reserves For Worker Compensation And Cargo Claims DeferredIncomeTaxExpenseBenefitReservesForWorkerCompensationAndCargoClaims	-1880000
CY2018	arcb	Deferred Income Tax Expense Benefit Reserves For Worker Compensation And Cargo Claims DeferredIncomeTaxExpenseBenefitReservesForWorkerCompensationAndCargoClaims	469000
CY2020	arcb	Deferred Income Tax Expense Benefit Revenue Recognition DeferredIncomeTaxExpenseBenefitRevenueRecognition	-1481000
CY2019	arcb	Deferred Income Tax Expense Benefit Revenue Recognition DeferredIncomeTaxExpenseBenefitRevenueRecognition	-1437000
CY2018	arcb	Deferred Income Tax Expense Benefit Revenue Recognition DeferredIncomeTaxExpenseBenefitRevenueRecognition	-2524000
CY2020	arcb	Deferred Income Tax Expense Benefit Allowance For Doubtful Accounts DeferredIncomeTaxExpenseBenefitAllowanceForDoubtfulAccounts	-652000
CY2019	arcb	Deferred Income Tax Expense Benefit Allowance For Doubtful Accounts DeferredIncomeTaxExpenseBenefitAllowanceForDoubtfulAccounts	541000
CY2018	arcb	Deferred Income Tax Expense Benefit Allowance For Doubtful Accounts DeferredIncomeTaxExpenseBenefitAllowanceForDoubtfulAccounts	-115000
CY2020	arcb	Deferred Income Tax Expense Benefit Pension And Other Retirement Plans DeferredIncomeTaxExpenseBenefitPensionAndOtherRetirementPlans	957000
CY2019	arcb	Deferred Income Tax Expense Benefit Pension And Other Retirement Plans DeferredIncomeTaxExpenseBenefitPensionAndOtherRetirementPlans	564000
CY2018	arcb	Deferred Income Tax Expense Benefit Pension And Other Retirement Plans DeferredIncomeTaxExpenseBenefitPensionAndOtherRetirementPlans	-2810000
CY2020	arcb	Deferred Income Tax Expense Benefit Multiemployer Pension Fund Withdrawal DeferredIncomeTaxExpenseBenefitMultiemployerPensionFundWithdrawal	157000
CY2019	arcb	Deferred Income Tax Expense Benefit Multiemployer Pension Fund Withdrawal DeferredIncomeTaxExpenseBenefitMultiemployerPensionFundWithdrawal	150000
CY2018	arcb	Deferred Income Tax Expense Benefit Multiemployer Pension Fund Withdrawal DeferredIncomeTaxExpenseBenefitMultiemployerPensionFundWithdrawal	-5818000
CY2020	arcb	Deferred Income Tax Expense Benefit Operating Loss Carryforwards Federal And State DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsFederalAndState	-259000
CY2019	arcb	Deferred Income Tax Expense Benefit Operating Loss Carryforwards Federal And State DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsFederalAndState	59000
CY2018	arcb	Deferred Income Tax Expense Benefit Operating Loss Carryforwards Federal And State DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsFederalAndState	746000
CY2020	arcb	Deferred Income Tax Expense Benefit State Depreciation Adjustments DeferredIncomeTaxExpenseBenefitStateDepreciationAdjustments	343000
CY2019	arcb	Deferred Income Tax Expense Benefit State Depreciation Adjustments DeferredIncomeTaxExpenseBenefitStateDepreciationAdjustments	-1302000
CY2018	arcb	Deferred Income Tax Expense Benefit State Depreciation Adjustments DeferredIncomeTaxExpenseBenefitStateDepreciationAdjustments	-1761000
CY2020	arcb	Deferred Income Tax Expense Benefit Compensation And Benefits Share Based Compensation Cost DeferredIncomeTaxExpenseBenefitCompensationAndBenefitsShareBasedCompensationCost	-195000
CY2019	arcb	Deferred Income Tax Expense Benefit Compensation And Benefits Share Based Compensation Cost DeferredIncomeTaxExpenseBenefitCompensationAndBenefitsShareBasedCompensationCost	-709000
CY2018	arcb	Deferred Income Tax Expense Benefit Compensation And Benefits Share Based Compensation Cost DeferredIncomeTaxExpenseBenefitCompensationAndBenefitsShareBasedCompensationCost	-529000
CY2020	arcb	Deferred Income Tax Expense Benefit Valuation Allowance DeferredIncomeTaxExpenseBenefitValuationAllowance	617000
CY2019	arcb	Deferred Income Tax Expense Benefit Valuation Allowance DeferredIncomeTaxExpenseBenefitValuationAllowance	383000
CY2018	arcb	Deferred Income Tax Expense Benefit Valuation Allowance DeferredIncomeTaxExpenseBenefitValuationAllowance	-744000
CY2020	arcb	Deferred Income Tax Expense Benefit Other Accrued Expenses DeferredIncomeTaxExpenseBenefitOtherAccruedExpenses	1663000
CY2019	arcb	Deferred Income Tax Expense Benefit Other Accrued Expenses DeferredIncomeTaxExpenseBenefitOtherAccruedExpenses	-699000
CY2018	arcb	Deferred Income Tax Expense Benefit Other Accrued Expenses DeferredIncomeTaxExpenseBenefitOtherAccruedExpenses	-4881000
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Change In Tax Rate Deferred Tax Liability Income Tax Benefit TaxCutsAndJobsActOf2017ChangeInTaxRateDeferredTaxLiabilityIncomeTaxBenefit	3772000
CY2020	arcb	Deferred Income Tax Expense Benefit Prepaid Expenses DeferredIncomeTaxExpenseBenefitPrepaidExpenses	1207000
CY2019	arcb	Deferred Income Tax Expense Benefit Prepaid Expenses DeferredIncomeTaxExpenseBenefitPrepaidExpenses	1782000
CY2018	arcb	Deferred Income Tax Expense Benefit Prepaid Expenses DeferredIncomeTaxExpenseBenefitPrepaidExpenses	1313000
CY2020	arcb	Deferred Income Tax Expense Benefit Operating Lease Right Of Use Assets Liabilities Net DeferredIncomeTaxExpenseBenefitOperatingLeaseRightOfUseAssetsLiabilitiesNet	-13000
CY2019	arcb	Deferred Income Tax Expense Benefit Operating Lease Right Of Use Assets Liabilities Net DeferredIncomeTaxExpenseBenefitOperatingLeaseRightOfUseAssetsLiabilitiesNet	-1049000
CY2020	arcb	Deferred Income Tax Expense Benefit Other DeferredIncomeTaxExpenseBenefitOther	395000
CY2019	arcb	Deferred Income Tax Expense Benefit Other DeferredIncomeTaxExpenseBenefitOther	-314000
CY2018	arcb	Deferred Income Tax Expense Benefit Other DeferredIncomeTaxExpenseBenefitOther	-92000
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7715000
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	5411000
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1872000
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	40502000
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	41757000
CY2020Q4	arcb	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	33933000
CY2019Q4	arcb	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	19726000
CY2020Q4	arcb	Deferred Tax Assets Tax Deferred Expense Supplemental Pension Liabilities DeferredTaxAssetsTaxDeferredExpenseSupplementalPensionLiabilities	103000
CY2019Q4	arcb	Deferred Tax Assets Tax Deferred Expense Supplemental Pension Liabilities DeferredTaxAssetsTaxDeferredExpenseSupplementalPensionLiabilities	1091000
CY2020Q4	arcb	Deferred Tax Assets Multiemployer Pension Fund Withdrawal DeferredTaxAssetsMultiemployerPensionFundWithdrawal	5409000
CY2019Q4	arcb	Deferred Tax Assets Multiemployer Pension Fund Withdrawal DeferredTaxAssetsMultiemployerPensionFundWithdrawal	5546000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	4871000
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	5359000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	5827000
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	5605000
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1353000
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1093000
CY2020Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	1426000
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1297000
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1538000
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	94721000
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	81715000
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	1284000
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	668000
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	93437000
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	81047000
CY2020Q4	arcb	Deferred Tax Liabilities Property Plant And Equipment And Other Long Lived Assets DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndOtherLongLivedAssets	113092000
CY2019Q4	arcb	Deferred Tax Liabilities Property Plant And Equipment And Other Long Lived Assets DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndOtherLongLivedAssets	107835000
CY2020Q4	arcb	Deferred Tax Liabilities Operating Lease Right Of Use Assets DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets	32923000
CY2019Q4	arcb	Deferred Tax Liabilities Operating Lease Right Of Use Assets DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets	18703000
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	7520000
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	7373000
CY2019Q4	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	669000
CY2020Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	6151000
CY2019Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	4952000
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	159686000
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	139532000
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	66249000
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	58485000
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	19424000
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	10809000
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-840000
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1395000
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1344000
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1682000
CY2020	arcb	Income Tax Reconciliation Life Insurance Proceeds And Changes IncomeTaxReconciliationLifeInsuranceProceedsAndChanges	-488000
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	17721000
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-1062000
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-637000
CY2019	arcb	Income Tax Reconciliation Life Insurance Proceeds And Changes IncomeTaxReconciliationLifeInsuranceProceedsAndChanges	-775000
CY2018	arcb	Income Tax Reconciliation Life Insurance Proceeds And Changes IncomeTaxReconciliationLifeInsuranceProceedsAndChanges	7000
CY2020	arcb	Income Tax Reconciliation Tax Credits Fuel Tax IncomeTaxReconciliationTaxCreditsFuelTax	1261000
CY2019	arcb	Income Tax Reconciliation Tax Credits Fuel Tax IncomeTaxReconciliationTaxCreditsFuelTax	2340000
CY2018	arcb	Income Tax Reconciliation Tax Credits Fuel Tax IncomeTaxReconciliationTaxCreditsFuelTax	1203000
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	617000
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	382000
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-891000
CY2020	arcb	Effective Income Tax Rate Reconciliation Change In Uncertain Tax Positions EffectiveIncomeTaxRateReconciliationChangeInUncertainTaxPositions	-933000
CY2019	arcb	Effective Income Tax Rate Reconciliation Change In Uncertain Tax Positions EffectiveIncomeTaxRateReconciliationChangeInUncertainTaxPositions	-20000
CY2018	arcb	Effective Income Tax Rate Reconciliation Change In Uncertain Tax Positions EffectiveIncomeTaxRateReconciliationChangeInUncertainTaxPositions	933000
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	420000
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	388000
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	-649000
CY2018	arcb	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Fiscal Year Tax Filing Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017FiscalYearTaxFilingAmount	-52000
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-3772000
CY2019	arcb	Effective Income Tax Rate Reconciliation Nonunion Pension Termination Expense EffectiveIncomeTaxRateReconciliationNonunionPensionTerminationExpense	1040000
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Foreign IncomeTaxReconciliationTaxCreditsForeign	391000
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Foreign IncomeTaxReconciliationTaxCreditsForeign	2054000
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Foreign IncomeTaxReconciliationTaxCreditsForeign	2216000
CY2020	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	2078000
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	1354000
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	306000
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-385000
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	187000
CY2020	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	15949000
CY2019	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	6398000
CY2018	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	10907000
CY2020	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	5056000
CY2019	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	3034000
CY2018	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	4001000
CY2020	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	391000
CY2019	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	2054000
CY2018	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	2216000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21396000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11486000
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17124000
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.231
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.223
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.203
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2018Q1	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.3274
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	28600000
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	28100000
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	21800000
CY2020	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	13300000
CY2019	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	13100000
CY2018	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	18500000
CY2020Q4	arcb	Income Tax Examination Number Of States Under Examination IncomeTaxExaminationNumberOfStatesUnderExamination	1
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	900000
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1000000.0
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0
CY2020	us-gaap	Lessor Operating Lease Existence Of Option To Terminate LessorOperatingLeaseExistenceOfOptionToTerminate	false
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	24559000
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	22291000
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	3152000
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	3366000
CY2020	us-gaap	Sublease Income SubleaseIncome	398000
CY2019	us-gaap	Sublease Income SubleaseIncome	324000
CY2020	us-gaap	Lease Cost LeaseCost	27313000
CY2019	us-gaap	Lease Cost LeaseCost	25333000
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	20500000
CY2020	arcb	Operating Lease Noncash Change In Operating Right Of Use Assets OperatingLeaseNoncashChangeInOperatingRightOfUseAssets	21184000
CY2019	arcb	Operating Lease Noncash Change In Operating Right Of Use Assets OperatingLeaseNoncashChangeInOperatingRightOfUseAssets	20439000
CY2020	arcb	Operating Lease Change In Operating Lease Liabilities OperatingLeaseChangeInOperatingLeaseLiabilities	20428000
CY2019	arcb	Operating Lease Change In Operating Lease Liabilities OperatingLeaseChangeInOperatingLeaseLiabilities	19711000
CY2020	arcb	Operating Right Use Of Assets And Lease Liabilities Net OperatingRightUseOfAssetsAndLeaseLiabilitiesNet	756000
CY2019	arcb	Operating Right Use Of Assets And Lease Liabilities Net OperatingRightUseOfAssetsAndLeaseLiabilitiesNet	728000
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	23810000
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	21714000
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	115195000
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	21482000
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	97839000
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	119321000
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y8M12D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0318
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	68470000
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	20265000
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	52277000
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	72542000
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y3M18D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0377
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	24629000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	21073000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	16755000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	14668000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	12153000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	43035000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	132313000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	12992000
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	119321000
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	284224000
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	323519000
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	67105000
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	57305000
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	217119000
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	266214000
CY2020Q4	arcb	Maturities Of Long Term Debt And Future Minimum Payments Under Capital Leases Due Current MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueCurrent	73386000
CY2020Q4	arcb	Maturities Of Long Term Debt And Future Minimum Payments Under Capital Leases Due In Two Years MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInTwoYears	64750000
CY2020Q4	arcb	Maturities Of Long Term Debt And Future Minimum Payments Under Capital Leases Due In Three Years MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInThreeYears	48892000
CY2020Q4	arcb	Maturities Of Long Term Debt And Future Minimum Payments Under Capital Leases Due In Four Years MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFourYears	102393000
CY2020Q4	arcb	Maturities Of Long Term Debt And Future Minimum Payments Under Capital Leases Due In Five Years MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDueInFiveYears	9576000
CY2020Q4	arcb	Maturities Of Long Term Debt And Future Minimum Payments Under Capital Leases Due MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesDue	298997000
CY2020Q4	arcb	Maturities Of Long Term Debt And Future Minimum Payments Under Capital Leases Interest Included In Payments MaturitiesOfLongTermDebtAndFutureMinimumPaymentsUnderCapitalLeasesInterestIncludedInPayments	14773000
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	284224000
CY2020Q4	arcb	Debt Instrument Collateral Property Plant And Equipment Gross DebtInstrumentCollateralPropertyPlantAndEquipmentGross	353093000
CY2019Q4	arcb	Debt Instrument Collateral Property Plant And Equipment Gross DebtInstrumentCollateralPropertyPlantAndEquipmentGross	293799000
CY2020Q4	arcb	Debt Instrument Collateral Accumulated Depreciation And Amortization Property Plant And Equipment DebtInstrumentCollateralAccumulatedDepreciationAndAmortizationPropertyPlantAndEquipment	115424000
CY2019Q4	arcb	Debt Instrument Collateral Accumulated Depreciation And Amortization Property Plant And Equipment DebtInstrumentCollateralAccumulatedDepreciationAndAmortizationPropertyPlantAndEquipment	71405000
CY2020Q4	arcb	Debt Instrument Collateral Property Plant And Equipment Net DebtInstrumentCollateralPropertyPlantAndEquipmentNet	237669000
CY2019Q4	arcb	Debt Instrument Collateral Property Plant And Equipment Net DebtInstrumentCollateralPropertyPlantAndEquipmentNet	222394000
CY2020Q4	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.029
CY2020	us-gaap	Interest Paid Net InterestPaidNet	11300000
CY2019	us-gaap	Interest Paid Net InterestPaidNet	10900000
CY2018	us-gaap	Interest Paid Net InterestPaidNet	8700000
CY2020	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	300000
CY2019	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	200000
CY2020Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	12300000
CY2019Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	12800000
CY2020Q4	us-gaap	Self Insurance Reserve Current SelfInsuranceReserveCurrent	103898000
CY2019Q4	us-gaap	Self Insurance Reserve Current SelfInsuranceReserveCurrent	107149000
CY2020Q4	us-gaap	Accrued Vacation Current AccruedVacationCurrent	51728000
CY2019Q4	us-gaap	Accrued Vacation Current AccruedVacationCurrent	47730000
CY2020Q4	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	67690000
CY2019Q4	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	52720000
CY2020Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	10468000
CY2019Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	8722000
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	12962000
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	16000000
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	246746000
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	232321000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	71100000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	39985000
CY2020	arcb	Long Term Cash Incentive Plan Earning Period LongTermCashIncentivePlanEarningPeriod	P3Y
CY2020Q4	arcb	Deferred Compensation Cash Based Arrangements Liability Noncurrent DeferredCompensationCashBasedArrangementsLiabilityNoncurrent	14200000
CY2019Q4	arcb	Deferred Compensation Cash Based Arrangements Liability Noncurrent DeferredCompensationCashBasedArrangementsLiabilityNoncurrent	13700000
CY2018Q4	arcb	Deferred Compensation Cash Based Arrangements Liability Noncurrent DeferredCompensationCashBasedArrangementsLiabilityNoncurrent	18300000
CY2020Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	55700000
CY2019Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	53200000
CY2020	arcb	Life Insurance Policy Recognized Gains LifeInsurancePolicyRecognizedGains	2300000
CY2019	arcb	Life Insurance Policy Recognized Gains LifeInsurancePolicyRecognizedGains	3700000
CY2020Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.08
CY2020Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	2033000
CY2019Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.08
CY2019Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	2052000
CY2020Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.08
CY2020Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	2049000
CY2019Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.08
CY2019Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	2050000
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.08
CY2020Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	2040000
CY2019Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.08
CY2019Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	2043000
CY2020Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.08
CY2020Q4	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	2035000
CY2019Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.08
CY2019Q4	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	2042000
CY2020Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	3656938
CY2019Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	3404639
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	4300000
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	2924540000
CY2018	us-gaap	Costs And Expenses CostsAndExpenses	2984690000
CY2018	us-gaap	Net Income Loss NetIncomeLoss	67262000
CY2019	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	22000
CY2018	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	150000
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	71100000
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	39963000
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	67112000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25410232
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25535529
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25679736
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.80
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.56
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.61
CY2020	us-gaap	Net Income Loss NetIncomeLoss	71100000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	39985000
CY2018	us-gaap	Net Income Loss NetIncomeLoss	67262000
CY2019	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	21000
CY2018	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	145000
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	71100000
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	39964000
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	67117000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25410232
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25535529
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25679736
CY2020	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1012291
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	914526
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1019095
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26422523
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26450055
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26698831
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.69
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.51
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.51
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2940163000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2988310000
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3093788000
CY2020	us-gaap	Costs And Expenses CostsAndExpenses	2841885000
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	98278000
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	63770000
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	109098000
CY2020	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	3616000
CY2019	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	6453000
CY2018	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	3914000
CY2020	us-gaap	Interest And Debt Expense InterestAndDebtExpense	11697000
CY2019	us-gaap	Interest And Debt Expense InterestAndDebtExpense	11467000
CY2019	arcb	Nonoperating Income Expense And Interest And Debt Expense NonoperatingIncomeExpenseAndInterestAndDebtExpense	-12299000
CY2018	arcb	Nonoperating Income Expense And Interest And Debt Expense NonoperatingIncomeExpenseAndInterestAndDebtExpense	-24712000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	92496000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	51471000
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	84386000
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2940163000
CY2018	us-gaap	Interest And Debt Expense InterestAndDebtExpense	9468000
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2299000
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-7285000
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-19158000
CY2020	arcb	Nonoperating Income Expense And Interest And Debt Expense NonoperatingIncomeExpenseAndInterestAndDebtExpense	-5782000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2988310000
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3093788000
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2940163000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2988310000
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3093788000
CY2020	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	105051000
CY2019	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	160684000
CY2018	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	137675000
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	118391000
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	112466000
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	108635000
CY2020	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1368588000
CY2019	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1408409000
CY2018	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1398348000
CY2020	arcb	Rents Purchased Transportation Other Costs Of Services RentsPurchasedTransportationOtherCostsOfServices	974835000
CY2019	arcb	Rents Purchased Transportation Other Costs Of Services RentsPurchasedTransportationOtherCostsOfServices	934958000
CY2018	arcb	Rents Purchased Transportation Other Costs Of Services RentsPurchasedTransportationOtherCostsOfServices	989006000
CY2020	arcb	Fuel Supplies And Expenses FuelSuppliesAndExpenses	250221000
CY2019	arcb	Fuel Supplies And Expenses FuelSuppliesAndExpenses	316047000
CY2018	arcb	Fuel Supplies And Expenses FuelSuppliesAndExpenses	325126000
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	118391000
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	112466000
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	108635000
CY2020	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	129850000
CY2019	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	126146000
CY2018	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	123998000
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	26514000
CY2018	arcb	Multiemployer Pension Fund Withdrawal Liability Charge MultiemployerPensionFundWithdrawalLiabilityCharge	37922000
CY2018	us-gaap	Restructuring Charges RestructuringCharges	1655000
CY2020	us-gaap	Costs And Expenses CostsAndExpenses	2841885000
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	2924540000
CY2018	us-gaap	Costs And Expenses CostsAndExpenses	2984690000
CY2018	us-gaap	Restructuring Charges RestructuringCharges	1700000
CY2020Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	701399000
CY2020Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	627370000
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	794980000
CY2020Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	816414000
CY2020Q1	us-gaap	Costs And Expenses CostsAndExpenses	693580000
CY2020Q2	us-gaap	Costs And Expenses CostsAndExpenses	606945000
CY2020Q3	us-gaap	Costs And Expenses CostsAndExpenses	755198000
CY2020Q4	us-gaap	Costs And Expenses CostsAndExpenses	786162000
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	7819000
CY2020Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	20425000
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	39782000
CY2020Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	30252000
CY2020Q1	arcb	Nonoperating Income Expense And Interest And Debt Expense NonoperatingIncomeExpenseAndInterestAndDebtExpense	-5434000
CY2020Q2	arcb	Nonoperating Income Expense And Interest And Debt Expense NonoperatingIncomeExpenseAndInterestAndDebtExpense	309000
CY2020Q3	arcb	Nonoperating Income Expense And Interest And Debt Expense NonoperatingIncomeExpenseAndInterestAndDebtExpense	-604000
CY2020Q4	arcb	Nonoperating Income Expense And Interest And Debt Expense NonoperatingIncomeExpenseAndInterestAndDebtExpense	-53000
CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	483000
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4854000
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9774000
CY2020Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6285000
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	1902000
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	15880000
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	29404000
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	23914000
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.07
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.62
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.15
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.94
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.07
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.61
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.11
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.89
CY2020Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25390377
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25463559
CY2019Q4	arcb	Noncash Impairment Charge After Tax NoncashImpairmentChargeAfterTax	19800000
CY2019Q4	arcb	Noncash Impairment Charge Diluted Per Share NoncashImpairmentChargeDilutedPerShare	0.78
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25470094
CY2020Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25427449
CY2020Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26246800
CY2020Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26217957
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26592457
CY2020Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26734287
CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	711839000
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	771490000
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	787563000
CY2019Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	717418000
CY2019Q1	us-gaap	Costs And Expenses CostsAndExpenses	703248000
CY2019Q2	us-gaap	Costs And Expenses CostsAndExpenses	736290000
CY2019Q3	us-gaap	Costs And Expenses CostsAndExpenses	756355000
CY2019Q4	us-gaap	Costs And Expenses CostsAndExpenses	728647000
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	8591000
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	35200000
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	31208000
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-11229000
CY2019Q1	arcb	Nonoperating Income Expense And Interest And Debt Expense NonoperatingIncomeExpenseAndInterestAndDebtExpense	-1995000
CY2019Q2	arcb	Nonoperating Income Expense And Interest And Debt Expense NonoperatingIncomeExpenseAndInterestAndDebtExpense	-1640000
CY2019Q3	arcb	Nonoperating Income Expense And Interest And Debt Expense NonoperatingIncomeExpenseAndInterestAndDebtExpense	-7866000
CY2019Q4	arcb	Nonoperating Income Expense And Interest And Debt Expense NonoperatingIncomeExpenseAndInterestAndDebtExpense	-798000
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1708000
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9184000
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7072000
CY2019Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-6478000
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	4888000
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	24376000
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	16270000
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	-5549000
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.19
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.95
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.64
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.22
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.18
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.92
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.62
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.22
CY2019Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25570415
CY2019Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25554286
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25527982
CY2019Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25490393
CY2019Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26512349
CY2019Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26431592
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26416595
CY2019Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	25490393
CY2019Q4	us-gaap	Asset Impairment Charges AssetImpairmentCharges	26500000

Files In Submission

Name	View Source	Status
0001558370-21-002023-index-headers.html	Edgar Link	pending
0001558370-21-002023-index.html	Edgar Link	pending
0001558370-21-002023.txt	Edgar Link	pending
0001558370-21-002023-xbrl.zip	Edgar Link	pending
arcb-20201231.xsd	Edgar Link	pending
arcb-20201231x10k.htm	Edgar Link	pending
arcb-20201231x10k_htm.xml	Edgar Link	completed
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arcb-20201231_cal.xml	Edgar Link	unprocessable
arcb-20201231_def.xml	Edgar Link	unprocessable
arcb-20201231_lab.xml	Edgar Link	unprocessable
arcb-20201231_pre.xml	Edgar Link	unprocessable
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$ARCB
ARCBEST CORP /DE/ Stock $arcb

2020 Q4 Form 10-K Financial Statement

#000155837021002023 Filed on February 26, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ARCB ARCBEST CORP /DE/ Stock $arcb

2020 Q4 Form 10-K Financial Statement

#000155837021002023 Filed on February 26, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ARCB
ARCBEST CORP /DE/ Stock $arcb