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Pay vs Performance Disclosure

12 Months Ended

Dec. 31, 2024

USD ($)

Dec. 31, 2023

USD ($)

Dec. 31, 2022

USD ($)

Dec. 31, 2021

USD ($)

Dec. 31, 2020

USD ($)

Pay vs Performance Disclosure

Pay vs Performance Disclosure, Table

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Return on Capital

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Value of Initial Fixed $100

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Employed (Adjusted

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Average

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Average

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Investment Based On:

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ROCE)

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Summary

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Summary

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Compensation

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Peer Group

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Compensation

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Compensation

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Compensation

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Actually Paid

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Total

Total

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Table Total

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Actually Paid

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Table Total for

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to Non-PEO

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Shareholder

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Shareholder

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Net Income

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Average

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for PEO

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to PEO(1)

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Non-PEO NEOs

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NEOs(1)

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Return(2)

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Return(3)

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(millions)(4)

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1 Year(5)

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3 Year(5)

Year (a)

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(b)

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(c)

(d)

(e)

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(f)

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(g)

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(h)

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(i)

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(j)

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2024

4,495,698

3,710,611

1,232,110

944,432

348.68

226.81

173.96

12.4

%

23.5

%

2023

6,315,108

10,548,681

1,737,578

2,508,269

447.38

234.79

195.43

20.1

%

28.6

%

2022

6,430,893

384,908

2,097,211

342,776

259.47

172.36

298.21

39.9

%

26.7

%

2021

6,006,289

16,582,019

2,131,000

5,779,949

441.63

209.49

213.52

34.8

%

19.4

%

2020

4,174,608

6,594,027

1,648,558

2,599,276

156.55

133.23

71.10

15.4

%

11.7

%

(1) Reflects the CAP for the PEO and the average CAP for the Non-PEO NEOs for the covered years, as computed in accordance with Item 402(v) of Regulation S-K. The following adjustments were made to the Summary Compensation Table total compensation to determine the CAP:

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Reported Change in the

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Reported Summary

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Reported Value of

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Equity Award

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Actuarial Present Value of

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Pension Benefit

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Compensation Table Total(i)

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Equity Awards(ii)

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Adjustments(iii)

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Pension Benefits(iv)

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Adjustments(v)

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Compensation Actually Paid

Year

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A

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B

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C

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D

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E

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A-B+C-D+E

Company’s PEO

2024

4,495,698

989,748

214,693

10,032

—

3,710,611

Average of Non-PEO NEOs

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2024

1,232,110

224,285

(63,393)

—

—

944,432

(i) Reflects the amounts (or the average amounts for the Non-PEO NEOs) reported in the “Total” column of the Summary Compensation Table for the covered year.

(ii) Reflects the grant date fair value of equity awards granted to the PEO (or the average amounts with regard to the Non-PEO NEOs) as reported in the “Stock Awards” column in the Summary Compensation Table for the covered year.

(iii) The equity award adjustments for the covered year include the addition (or subtraction, as applicable) as set forth in the table below. The fair values of equity awards were calculated using closing stock price as of the applicable valuation dates and are not adjusted for present value of dividends (which are not payable with respect to RSUs granted to Named Executive Officers).

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​		​		Year over Year Change in Fair		​		​		​
​	​	Year End Fair Value of	​	Value of Outstanding and	​	Year over Year Change in Fair Value of	​	Fair value of	​	​
​	​	Equity Awards Granted	​	Unvested	​	Equity Awards Granted in Prior Years	​	forfeited awards at	​	Total Equity Award
Year	​	During the Fiscal Year	​	Equity Awards	​	that Vested in the Year	​	end of prior year	​	Adjustments
Company’s PEO	​	​
2024		797,886		(395,310)		(187,883)		—		214,693
Average of Non-PEO NEOs	​	​
2024		137,647		(65,000)		(39,842)		96,198		(63,393)

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(iv) Reflects the amounts reported in the “Change in Pension Value and Nonqualified Deferred Compensation Earnings” column of the Summary Compensation Table for the covered years.

(v) These amounts reflect the actuarially determined service cost for services rendered during the applicable year. The Company’s legacy non-contractual defined benefit pension plan was terminated effective December 31, 2017, and fully liquidated as of December 31, 2019. Therefore, no services costs were incurred in any of the covered years.

(2) Total Shareholder Return (TSR) is calculated assuming $100 was invested on December 31, 2019, with reinvestment of dividends. All calculations have been prepared by Zacks Investment Research, Inc.

(3) The 2024 peer group includes the following companies: Covenant Logistics Group, Inc., Forward Air Corporation, Hub Group, Inc., J.B. Hunt Transport Services, Inc., Knight-Swift Transportation Holdings, Inc., Landstar System, Inc., Old Dominion Freight Line, Inc., RXO, Inc., Saia, Inc., Schneider National, Inc., TFI International Inc., Werner Enterprises, Inc., and XPO, Inc. Our 2024 peer group is identical to our 2023 peer group, except that RXO, Inc. and XPO, Inc. were not included in the 2023 peer group.  The following table sets forth the TSR for the 2023 peer group for each of the five years reported:

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Year		2023 Peer Group Total Shareholder Return
2024		216.56
2023		235.83
2022		180.19
2021	​	216.63
2020		130.88

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(4) Net income as reported in the Company’s audited financial statements for each covered year, which includes, for the applicable years, income from discontinued operations.

(5) Reflects the one-year and three-year average Adjusted ROCE of the Company as approved by the Compensation Committee for purposes of the Company’s annual cash incentive compensation plan and long-term cash incentive compensation plan for each covered year. The Company has determined that one-year Adjusted ROCE as used in its annual cash incentive compensation plan is the financial performance measure that, in the Company’s assessment, represents the most important performance measure (that is not otherwise required to be disclosed in the table) used by the Company to link CAP to the Named Executive Officers, for the most recently completed fiscal year, to Company performance. Because the Company uses three-year average Adjusted ROCE in its long-term cash incentive program as discussed in greater detail in “Compensation Discussion & Analysis — Components of Compensation — Long-Term Incentive Compensation,” the Company is providing, on a supplemental basis, its three-year average Adjusted ROCE for each covered year. For more information, see the section below titled “Financial Performance Measures.”

Company Selected Measure Name

Adjusted ROCE

Named Executive Officers, Footnote

Ms. McReynolds served as Principal Executive Officer (“PEO”) in each year. The names of the non-PEO Named Executive Officers (the “Non-PEO NEOs”) included for purposes of calculating the average amounts in each covered year are as follows: (i) for 2024, Seth K. Runser, J. Matthew Beasley, Dennis L Anderson II and Michael E. Newcity; (ii) for 2023, J. Matthew Beasley, Seth K. Runser, Dennis L. Anderson II, Michael E. Newcity and David R. Cobb; (iii) for 2022, David R. Cobb, Michael E. Newcity, Seth K. Runser, Daniel E. Loe and Dennis L. Anderson II; (iv) for 2021, David R. Cobb, Michael E. Newcity, James A. Ingram and Dennis L. Anderson II; and (v) for 2020, Timothy D. Thorne, David R. Cobb, Michael E. Newcity and James A. Ingram.

Peer Group Issuers, Footnote

(3) The 2024 peer group includes the following companies: Covenant Logistics Group, Inc., Forward Air Corporation, Hub Group, Inc., J.B. Hunt Transport Services, Inc., Knight-Swift Transportation Holdings, Inc., Landstar System, Inc., Old Dominion Freight Line, Inc., RXO, Inc., Saia, Inc., Schneider National, Inc., TFI International Inc., Werner Enterprises, Inc., and XPO, Inc. Our 2024 peer group is identical to our 2023 peer group, except that RXO, Inc. and XPO, Inc. were not included in the 2023 peer group.  The following table sets forth the TSR for the 2023 peer group for each of the five years reported:

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Year		2023 Peer Group Total Shareholder Return
2024		216.56
2023		235.83
2022		180.19
2021	​	216.63
2020		130.88

Changed Peer Group, Footnote

Our 2024 peer group is identical to our 2023 peer group, except that RXO, Inc. and XPO, Inc. were not included in the 2023 peer group.

PEO Total Compensation Amount

$ 4,495,698

$ 6,315,108

$ 6,430,893

$ 6,006,289

$ 4,174,608

PEO Actually Paid Compensation Amount

$ 3,710,611

10,548,681

384,908

16,582,019

6,594,027

Adjustment To PEO Compensation, Footnote

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Reported Change in the

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Reported Summary

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Reported Value of

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Equity Award

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Actuarial Present Value of

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Pension Benefit

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Compensation Table Total(i)

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Equity Awards(ii)

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Adjustments(iii)

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Pension Benefits(iv)

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Adjustments(v)

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Compensation Actually Paid

Year

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A

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B

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C

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D

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E

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A-B+C-D+E

Company’s PEO

2024

4,495,698

989,748

214,693

10,032

—

3,710,611

Average of Non-PEO NEOs

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2024

1,232,110

224,285

(63,393)

—

—

944,432

(i) Reflects the amounts (or the average amounts for the Non-PEO NEOs) reported in the “Total” column of the Summary Compensation Table for the covered year.

(ii) Reflects the grant date fair value of equity awards granted to the PEO (or the average amounts with regard to the Non-PEO NEOs) as reported in the “Stock Awards” column in the Summary Compensation Table for the covered year.

(iii) The equity award adjustments for the covered year include the addition (or subtraction, as applicable) as set forth in the table below. The fair values of equity awards were calculated using closing stock price as of the applicable valuation dates and are not adjusted for present value of dividends (which are not payable with respect to RSUs granted to Named Executive Officers).

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​		​		Year over Year Change in Fair		​		​		​
​	​	Year End Fair Value of	​	Value of Outstanding and	​	Year over Year Change in Fair Value of	​	Fair value of	​	​
​	​	Equity Awards Granted	​	Unvested	​	Equity Awards Granted in Prior Years	​	forfeited awards at	​	Total Equity Award
Year	​	During the Fiscal Year	​	Equity Awards	​	that Vested in the Year	​	end of prior year	​	Adjustments
Company’s PEO	​	​
2024		797,886		(395,310)		(187,883)		—		214,693
Average of Non-PEO NEOs	​	​
2024		137,647		(65,000)		(39,842)		96,198		(63,393)

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(iv) Reflects the amounts reported in the “Change in Pension Value and Nonqualified Deferred Compensation Earnings” column of the Summary Compensation Table for the covered years.

(v) These amounts reflect the actuarially determined service cost for services rendered during the applicable year. The Company’s legacy non-contractual defined benefit pension plan was terminated effective December 31, 2017, and fully liquidated as of December 31, 2019. Therefore, no services costs were incurred in any of the covered years.

Non-PEO NEO Average Total Compensation Amount

$ 1,232,110

1,737,578

2,097,211

2,131,000

1,648,558

Non-PEO NEO Average Compensation Actually Paid Amount

$ 944,432

2,508,269

342,776

5,779,949

2,599,276

Adjustment to Non-PEO NEO Compensation Footnote

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Reported Change in the

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Reported Summary

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Reported Value of

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Equity Award

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Actuarial Present Value of

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Pension Benefit

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Compensation Table Total(i)

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Equity Awards(ii)

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Adjustments(iii)

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Pension Benefits(iv)

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Adjustments(v)

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Compensation Actually Paid

Year

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A

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B

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C

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D

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E

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A-B+C-D+E

Company’s PEO

2024

4,495,698

989,748

214,693

10,032

—

3,710,611

Average of Non-PEO NEOs

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2024

1,232,110

224,285

(63,393)

—

—

944,432

(i) Reflects the amounts (or the average amounts for the Non-PEO NEOs) reported in the “Total” column of the Summary Compensation Table for the covered year.

(ii) Reflects the grant date fair value of equity awards granted to the PEO (or the average amounts with regard to the Non-PEO NEOs) as reported in the “Stock Awards” column in the Summary Compensation Table for the covered year.

(iii) The equity award adjustments for the covered year include the addition (or subtraction, as applicable) as set forth in the table below. The fair values of equity awards were calculated using closing stock price as of the applicable valuation dates and are not adjusted for present value of dividends (which are not payable with respect to RSUs granted to Named Executive Officers).

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​		​		Year over Year Change in Fair		​		​		​
​	​	Year End Fair Value of	​	Value of Outstanding and	​	Year over Year Change in Fair Value of	​	Fair value of	​	​
​	​	Equity Awards Granted	​	Unvested	​	Equity Awards Granted in Prior Years	​	forfeited awards at	​	Total Equity Award
Year	​	During the Fiscal Year	​	Equity Awards	​	that Vested in the Year	​	end of prior year	​	Adjustments
Company’s PEO	​	​
2024		797,886		(395,310)		(187,883)		—		214,693
Average of Non-PEO NEOs	​	​
2024		137,647		(65,000)		(39,842)		96,198		(63,393)

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(iv) Reflects the amounts reported in the “Change in Pension Value and Nonqualified Deferred Compensation Earnings” column of the Summary Compensation Table for the covered years.

(v) These amounts reflect the actuarially determined service cost for services rendered during the applicable year. The Company’s legacy non-contractual defined benefit pension plan was terminated effective December 31, 2017, and fully liquidated as of December 31, 2019. Therefore, no services costs were incurred in any of the covered years.

Compensation Actually Paid vs. Total Shareholder Return

CAP vs. Company TSR and Peer Group TSR

The following graph compares the CAP to Ms. McReynolds and the average amount of CAP to the Non-PEO NEOs with the Company’s cumulative TSR and the peer group TSR over the five years presented. TSR is calculated assuming $100 was invested on December 31, 2019, with reinvestment of dividends. The Company’s cumulative TSR over the five-year period was $348.68, while the cumulative TSR of the peer group was $226.81 over the same period.

CAP VS. COMPANY TSR AND PEER GROUP TSR

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Compensation Actually Paid vs. Net Income

CAP vs. Net Income

The following graph compares the CAP to Ms. McReynolds and the average amount of CAP to the Non-PEO NEOs with our net income over the five years presented. While we do not use net income as a compensation performance metric in our executive compensation program, the measure of net income may correlate to Adjusted Operating Income, which we use in our AIP. Because a significant portion of CAP is comprised of equity awards, which have multi-year vesting periods, CAP is more heavily impacted by fluctuations in stock price year-over-year, as compared to net income.

CAP VS. NET INCOME

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Compensation Actually Paid vs. Company Selected Measure

CAP vs. Annual and Three-Year Average Adjusted ROCE

The following graph compares the CAP to Ms. McReynolds and the average amount of CAP to the Non-PEO NEOs with (i) our one-year Adjusted ROCE, calculated in accordance with our AIP, and (ii) on a supplemental basis, the average three-year Adjusted ROCE, calculated in accordance with our C-LTIP program, each over the five years presented. While the Company uses several financial performance measures to evaluate performance for purposes of its executive compensation program, the Company has determined that one-year Adjusted ROCE as used in the AIP is the financial performance measure that, in the Company’s assessment, represents the most important performance measure (that is not otherwise required to be disclosed in the table) used by the Company to link CAP to the Named Executive Officers, for the most recently completed fiscal year, to Company performance.

CAP VS. ANNUAL AND THREE-YEAR AVERAGE ADJUSTED ROCE

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Total Shareholder Return Vs Peer Group

CAP vs. Company TSR and Peer Group TSR

The following graph compares the CAP to Ms. McReynolds and the average amount of CAP to the Non-PEO NEOs with the Company’s cumulative TSR and the peer group TSR over the five years presented. TSR is calculated assuming $100 was invested on December 31, 2019, with reinvestment of dividends. The Company’s cumulative TSR over the five-year period was $348.68, while the cumulative TSR of the peer group was $226.81 over the same period.

CAP VS. COMPANY TSR AND PEER GROUP TSR

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Tabular List, Table

As described in greater detail in “Executive Compensation — Compensation Discussion & Analysis,” the Company’s executive compensation program reflects a variable pay-for-performance philosophy. The financial performance measures set forth in the table below (in unranked order), in the Company’s assessment, represent the most important financial performance measures used by the Company to link CAP to the Company’s named executive officers, for the most recently completed fiscal year, to the Company’s performance. The measures are utilized in our annual incentive compensation plan (“AIP”) and our cash long-term incentive compensation plan (“C-LTIP”) and are designed with the objective of aligning the executives’ interests with those of the Company’s stockholders.

Performance Measure		Compensation Weighting		For More Information
Adjusted Operating Income		60% of AIP		Page 45
Adjusted ROCE		40% of AIP		Page 45
Average Adjusted ROCE for the three-year performance period		60% of C-LTIP		Page 47
Relative TSR		40% of C-LTIP		Page 48

Total Shareholder Return Amount

$ 348.68

447.38

259.47

441.63

156.55

Peer Group Total Shareholder Return Amount

226.81

234.79

172.36

209.49

133.23

Net Income (Loss)

$ 173,960,000

$ 195,430,000

$ 298,210,000

$ 213,520,000

$ 71,100,000

Company Selected Measure Amount

12.4

20.1

39.9

34.8

15.4

PEO Name

Ms. McReynolds

Ms. McReynolds

Ms. McReynolds

Ms. McReynolds

Ms. McReynolds

Equity Awards Adjustments, Footnote

(iii) The equity award adjustments for the covered year include the addition (or subtraction, as applicable) as set forth in the table below. The fair values of equity awards were calculated using closing stock price as of the applicable valuation dates and are not adjusted for present value of dividends (which are not payable with respect to RSUs granted to Named Executive Officers).

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​		​		Year over Year Change in Fair		​		​		​
​	​	Year End Fair Value of	​	Value of Outstanding and	​	Year over Year Change in Fair Value of	​	Fair value of	​	​
​	​	Equity Awards Granted	​	Unvested	​	Equity Awards Granted in Prior Years	​	forfeited awards at	​	Total Equity Award
Year	​	During the Fiscal Year	​	Equity Awards	​	that Vested in the Year	​	end of prior year	​	Adjustments
Company’s PEO	​	​
2024		797,886		(395,310)		(187,883)		—		214,693
Average of Non-PEO NEOs	​	​
2024		137,647		(65,000)		(39,842)		96,198		(63,393)

Prior Year Peer Group Total Shareholder Return

$ 216.56

$ 235.83

$ 180.19

$ 216.63

$ 130.88

Measure:: 1

Pay vs Performance Disclosure

Name

Adjusted Operating Income

Adjusted Operating Income, Compensation Weighting % of AIP

60.00%

Measure:: 2

Pay vs Performance Disclosure

Name

Adjusted ROCE

Adjusted ROCE, Compensation Weighting % of AIP

40.00%

Measure:: 3

Pay vs Performance Disclosure

Other Performance Measure, Amount

23.5

28.6

26.7

19.4

11.7

Name

Average Adjusted ROCE for the three-year performance period

Average Adjusted ROCE for the three-year performance period, Compensation Weighting % of C-LTIP

60.00%

Measure:: 4

Pay vs Performance Disclosure

Name

Relative TSR

Relative TSR, Compensation Weighting % of C-LTIP

40.00%

PEO | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

$ (10,032)

PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(989,748)

PEO | Equity Awards Adjustments, Excluding Value Reported in Compensation Table

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

214,693

PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

797,886

PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(395,310)

PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(187,883)

Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(224,285)

Non-PEO NEO | Equity Awards Adjustments, Excluding Value Reported in Compensation Table

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(63,393)

Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

137,647

Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(65,000)

Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(39,842)

Non-PEO NEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

$ 96,198

X

- Definition

Adjusted Operating Income compensation weighting percentage of annual incentive compensation plan ("AIP").

+ References

No definition available.

+ Details

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Namespace Prefix:	arcb_
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Balance Type:	na
Period Type:	duration

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- Definition

Adjusted Return on Capital Employed compensation weighting percentage of annual incentive compensation plan ("AIP").

+ References

No definition available.

+ Details

Name:	arcb_AdjustedRoceCompensationWeightingPercentageOfAnnualIncentiveCompensationPlan
Namespace Prefix:	arcb_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Average Adjusted Return on Capital Employed for the three-year performance period compensation weighting percentage of cash long-term incentive compensation plan ("C-LTIP").

+ References

No definition available.

+ Details

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Namespace Prefix:	arcb_
Data Type:	dtr-types:percentItemType
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Period Type:	duration

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- Definition

Total shareholder return for the prior year peer group.

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No definition available.

+ Details

Name:	arcb_PriorYearPeerGroupTotalShareholderRtnAmt
Namespace Prefix:	arcb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Relative Total Shareholder Return compensation weighting percentage of cash long-term incentive compensation plan ("C-LTIP").

+ References

No definition available.

+ Details

Name:	arcb_RelativeTsrCompensationWeightingPercentageOfCashLongTermIncentiveCompensationPlan
Namespace Prefix:	arcb_
Data Type:	dtr-types:percentItemType
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- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K
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