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EMPLOYEE BENEFIT PLANS (Details 6) (ABF Freight, USD $) In Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Aug. 01, 2013 Multiemployer pension plans | Aug. 01, 2012 Multiemployer pension plans | Aug. 01, 2011 Multiemployer pension plans | Dec. 31, 2013 Multiemployer pension plans plan | Dec. 31, 2012 Multiemployer pension plans | Dec. 31, 2011 Multiemployer pension plans | Dec. 31, 2013 Central States Pension Plan | Dec. 31, 2012 Central States Pension Plan | Dec. 31, 2011 Central States Pension Plan | Dec. 31, 2005 Central States Pension Plan | Jan. 02, 2013 Central States Pension Plan | Jan. 02, 2012 Central States Pension Plan | Jan. 02, 2011 Central States Pension Plan | Dec. 31, 2013 Central States Pension Plan Maximum | Dec. 31, 2012 Central States Pension Plan Maximum | Dec. 31, 2011 Central States Pension Plan Maximum | Dec. 31, 2013 Central States Pension Plan Minimum | Dec. 31, 2012 Central States Pension Plan Minimum | Dec. 31, 2011 Central States Pension Plan Minimum | Dec. 31, 2013 Western Conference of Teamsters Pension Plan | Dec. 31, 2012 Western Conference of Teamsters Pension Plan | Dec. 31, 2011 Western Conference of Teamsters Pension Plan | Dec. 31, 2013 Central Pennsylvania Teamsters Pension Plan | Dec. 31, 2012 Central Pennsylvania Teamsters Pension Plan | Dec. 31, 2011 Central Pennsylvania Teamsters Pension Plan | Jan. 31, 2012 Local 710 Pension Fund | Jan. 31, 2011 Local 710 Pension Fund | Dec. 31, 2013 Local 710 Pension Fund | Dec. 31, 2012 Local 710 Pension Fund | Dec. 31, 2011 Local 710 Pension Fund | Dec. 31, 2013 All Other Pension Plans in Aggregate | Dec. 31, 2012 All Other Pension Plans in Aggregate | Dec. 31, 2011 All Other Pension Plans in Aggregate | Aug. 01, 2013 Multiemployer health and welfare plans | Aug. 01, 2012 Multiemployer health and welfare plans | Aug. 01, 2011 Multiemployer health and welfare plans | Dec. 31, 2013 Multiemployer health and welfare plans plan | Dec. 31, 2012 Multiemployer health and welfare plans | Dec. 31, 2011 Multiemployer health and welfare plans
Multiemployer Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employees covered under ABF NMFA (as a percent) |  |  |  | 76.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of multiemployer plans to which ABF currently contributes |  |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44 |  |
Maximum funded percentage of plans in yellow zone |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum funded percentage of plans in red zone |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum required increase in employer's contribution to multiemployer plans that enter reorganization status (as a percent) |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of contributions to the multiemployer pension plans that are in critical status |  |  |  | 63.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of contributions to the multiemployer pension plans that are in endangered status |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total contributions to multiemployer plans |  |  |  | $ 136,233 | $ 131,895 | $ 132,841 | $ 70,020 | $ 68,683 | $ 70,579 |  |  |  |  |  |  |  |  |  |  | $ 20,601 | $ 20,774 | $ 20,807 | $ 12,143 | $ 11,170 | $ 12,022 |  |  | $ 10,001 | $ 9,567 | $ 9,265 | $ 23,468 | $ 21,701 | $ 20,168 |  |  |  | $ 118,000 | $ 113,000 | $ 112,100
Threshold percentage of the entity's contributions relative to total fund contributions, which was exceeded during the period |  |  |  |  |  |  |  | 5.00% | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 5.00% | 5.00% | 5.00% |  |  |  |  |  |  |  |  |  |  |  |
Percentage increase in contribution rate for time worked related to benefit costs | 0.020 | 0.023 | 0.036 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.076 | 0.053 | 0.041 |  |  |
Percentage of contributions to multiemployer pension plan |  |  |  |  |  |  |  |  |  |  |  |  |  | 55.00% | 55.00% | 55.00% | 50.00% | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actuarially certified funded percentage of multiemployer pension plan |  |  |  |  |  |  |  |  |  |  | 47.60% | 53.90% | 58.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of extension granted by Internal Revenue Service for amortization of unfunded liabilities |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Represents the funded percentage of a specified multiemployer pension plan. + References No definition available. + Details
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- Definition Represents the maximum funded percentage of plans in the red zone. + References No definition available. + Details
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- Definition Represents the maximum funded percentage of plans in the yellow zone. + References No definition available. + Details
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- Definition Represents the percentage of the entity's contributions to multiemployer pension plans that are made to the specified plan. + References No definition available. + Details
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- Definition Represents the percentage of the entity's contributions to multiemployer pension plans that are made to plans in critical status. + References No definition available. + Details
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- Definition Represents the percentage of the entity's contributions to multiemployer pension plans that are made to plans in endangered status. + References No definition available. + Details
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- Definition Represents the period of extension granted by the Internal Revenue Service for amortization of unfunded liabilities by a specified fund. + References No definition available. + Details
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- Definition Represents the maximum increased required contribution percentage by contributing employers to multiemployer plans that enter reorganization status. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Represents the number of multiemployer plans to which the reporting entity currently contributes. + References No definition available. + Details
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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Definition Percentage of employee participants subject to a collective bargaining arrangement to all of the employer's participants in a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Definition Increase (decrease) in the employer's contractual contribution rate to the multiemployer plan. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450673-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450702-114947 + Details
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