Amount of pre-tax expenses associated with multiemployer pension fund withdrawal liability.

No definition available.

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Represents the projected funded percentage of a specified multiemployer pension plan.

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No definition available.

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Represents the maximum funded percentage of plans in the red zone.

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No definition available.

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Represents the maximum funded percentage of plans in the yellow zone.

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No definition available.

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Represents the minimum funded percentage of plans in the yellow zone.

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No definition available.

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Represents the percentage of the entity's contributions to multiemployer pension plans that are made to the specified plan.

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No definition available.

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Represents the percentage of the entity's contributions to multiemployer pension plans that are made to plans in critical and declining status.

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No definition available.

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Represents the percentage of the entity's contributions to multiemployer pension plans that are made to plans in critical status.

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No definition available.

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Represents the percentage of the entity's contributions to multiemployer pension plans that are made to plans in endangered status.

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No definition available.

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Amount of contributions made to multiemployer plan by employer related to pension fund withdrawal liability.

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No definition available.

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Represents the threshold percentage of the entity's contributions to the plan relative to total contributions received by the plan, which was exceeded during the period, triggering disclosure of the plan year.

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No definition available.

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Represents the percentage of the entity's contributions to individually insignificant multiemployer pension plan.

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No definition available.

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The threshold funded percentage of plans, below which a higher maximum period for insolvency is used to determine "critical and declining" status.

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No definition available.

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The threshold ratio of inactive participants to active participants, above which a higher maximum period for insolvency is used to determine "critical and declining" status.

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No definition available.

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The maximum period within which a plan in "critical and declining" status is expected to become insolvent, unless additional criteria relating to ratio of inactive to active participants or funded percentage are applicable.

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No definition available.

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The maximum period within which a plan in "critical and declining" status is expected to become insolvent, if additional criteria relating to ratio of inactive to active participants or funded percentage are applicable.

+ References

No definition available.

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The maximum period within which a plan is expected to become insolvent without legislation action.

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No definition available.

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The period of time over which monthly payments have to be made for withdrawal liability settlement for multiemployer plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Represents the number of multiemployer plans to which the reporting entity currently contributes.

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No definition available.

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Amount of cash outflow for initial lumpsum payment of withdrawal liability from multiemployer plan.

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No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Increase (decrease) in employer's contractual contribution rate to multiemployer plan.

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Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan.

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Amount of cost for employer contribution to multiemployer pension plan determined to be individually insignificant.

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Amount of cost for employer contribution to multiemployer pension plan determined to be individually significant.

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EMPLOYEE BENEFIT PLANS - Multiemployer Plans (Details) - Asset Based $ in Thousands					3 Months Ended		12 Months Ended
	Aug. 01, 2021	Aug. 01, 2020	Jan. 31, 2020	Aug. 01, 2019	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2021 USD ($) plan	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 01, 2020	Jan. 01, 2019
Multiemployer Plans
Minimum funded percentage of plans in green zone							80.00%
Nonunion Defined Benefit Pension Plan
Multiemployer Plans
Number of multiemployer plans to which ABF Freight currently contributes \| plan							25
Maximum funded percentage of plans in yellow zone							80.00%
Maximum funded percentage of plans in red zone							65.00%
Maximum projected time to insolvency for plans in "critical and declining" status							14 years
Maximum projected time to insolvency for plans in "critical and declining" status if additional criteria apply							19 years
Threshold ratio of inactive to active participants for greater insolvency period to determine "critical and declining" status							2
Threshold funded percentage for greater insolvency period to determine "critical and declining" status							80.00%
Percentage of contributions to the multiemployer pension plans that are in critical and declining status							56.00%
Percentage of contributions to the multiemployer pension plans that are in critical status							4.00%
Percentage of contributions to the multiemployer pension plans that are in endangered status							4.00%
Total multiemployer pension contributions paid							$ 146,893	$ 142,194	$ 153,746
Nonunion Defined Benefit Pension Plan \| Central States Pension Plan
Multiemployer Plans
Multiemployer pension contributions paid, individually significant							$ 71,045	$ 68,704	$ 75,803
Threshold percentage of the entity's contributions relative to total fund contributions, which was exceeded during the period								5.00%	5.00%
Maximum projected time to insolvency without legislative action							4 years
Percentage of contributions to multiemployer pension plan							50.00%	50.00%	50.00%
Actuarially certified projected funded percentage of multiemployer pension plan										19.50%	24.80%
Nonunion Defined Benefit Pension Plan \| Western Conference Of Teamsters Pension Plan
Multiemployer Plans
Multiemployer pension contributions paid, individually significant							$ 25,861	$ 23,633	$ 24,860
Nonunion Defined Benefit Pension Plan \| Central Pennsylvania Teamsters Pension Plan
Multiemployer Plans
Multiemployer pension contributions paid, individually significant							13,931	$ 13,485	$ 13,907
Threshold percentage of the entity's contributions relative to total fund contributions, which was exceeded during the period								5.00%	5.00%
Nonunion Defined Benefit Pension Plan \| Local 710 Pension Fund
Multiemployer Plans
Multiemployer pension contributions paid, individually significant							9,553	$ 9,885	$ 10,164
Threshold percentage of the entity's contributions relative to total fund contributions, which was exceeded during the period			5.00%
Nonunion Defined Benefit Pension Plan \| New England Teamsters and Trucking Industry Pension Fund
Multiemployer Plans
Multiemployer pension contributions paid, individually significant							4,357	4,464	4,802
Contributions to multiemployer plans related to pension fund withdrawal liability							1,600	1,600	1,600
Multiemployer pension fund withdrawal liability charge (pre-tax)						$ 37,900
Initial lump sum payment of withdrawal liability					$ 15,100
Withdrawal liability monthly payments period (in years)					23 years
Nonunion Defined Benefit Pension Plan \| Other Pension Plans
Multiemployer Plans
Multiemployer pension contributions paid, individually insignificant							$ 22,146	22,023	24,210
Nonunion Defined Benefit Pension Plan \| Western Pennsylvania Teamsters And Employers Pension Fund
Multiemployer Plans
Percentage of contributions to individually insignificant multiemployer pension plan							1.00%
Nonunion Defined Benefit Pension Plan \| New York State Teamsters Conference Pension and Retirement Fund
Multiemployer Plans
Percentage of contributions to individually insignificant multiemployer pension plan							1.00%
Nonunion Defined Benefit Pension Plan \| North Jersey Welfare Fund
Multiemployer Plans
Percentage of contributions to individually insignificant multiemployer pension plan							2.00%
Multiemployer health and welfare plans
Multiemployer Plans
Number of multiemployer plans to which ABF Freight currently contributes \| plan							38
Total multiemployer pension contributions paid							$ 176,200	$ 163,800	$ 172,000
Percentage increase in contribution rate for time worked related to benefit costs	4.30%	4.00%		3.90%
Unionized employees concentration risk \| Number of employees
Multiemployer Plans
Percentage of Asset-Based segment employees covered under collective bargaining agreement with the IBT							82.00%