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EMPLOYEE BENEFIT PLANS (Details 6) (ABF, USD $) In Thousands, unless otherwise specified | 12 Months Ended | 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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Dec. 31, 2012 Maximum | Dec. 31, 2012 Minimum | Aug. 02, 2012 Multiemployer pension plans | Aug. 02, 2011 Multiemployer pension plans | Aug. 02, 2010 Multiemployer pension plans | Dec. 31, 2012 Multiemployer pension plans plan | Dec. 31, 2011 Multiemployer pension plans | Dec. 31, 2010 Multiemployer pension plans | Dec. 31, 2012 Central States Pension Plan | Dec. 31, 2011 Central States Pension Plan | Dec. 31, 2010 Central States Pension Plan | Dec. 31, 2005 Central States Pension Plan | Jan. 02, 2012 Central States Pension Plan | Jan. 02, 2010 Central States Pension Plan | Dec. 31, 2012 Central States Pension Plan Maximum | Dec. 31, 2011 Central States Pension Plan Maximum | Dec. 31, 2010 Central States Pension Plan Maximum | Dec. 31, 2012 Central States Pension Plan Minimum | Dec. 31, 2011 Central States Pension Plan Minimum | Dec. 31, 2010 Central States Pension Plan Minimum | Dec. 31, 2012 Western Conference of Teamsters Pension Fund | Dec. 31, 2011 Western Conference of Teamsters Pension Fund | Dec. 31, 2010 Western Conference of Teamsters Pension Fund | Dec. 31, 2012 Central Pennsylvania Teamsters Pension Fund | Dec. 31, 2011 Central Pennsylvania Teamsters Pension Fund | Dec. 31, 2010 Central Pennsylvania Teamsters Pension Fund | Jan. 31, 2012 Local 710 Pension Fund | Jan. 31, 2011 Local 710 Pension Fund | Dec. 31, 2012 Local 710 Pension Fund | Dec. 31, 2011 Local 710 Pension Fund | Dec. 31, 2010 Local 710 Pension Fund | Aug. 02, 2012 Multiemployer health and welfare plans | Aug. 02, 2011 Multiemployer health and welfare plans | Aug. 02, 2010 Multiemployer health and welfare plans | Dec. 31, 2012 Multiemployer health and welfare plans plan | Dec. 31, 2011 Multiemployer health and welfare plans | Dec. 31, 2010 Multiemployer health and welfare plans | Dec. 31, 2012 All Other Pension Plans in Aggregate | Dec. 31, 2011 All Other Pension Plans in Aggregate | Dec. 31, 2010 All Other Pension Plans in Aggregate
Multiemployer Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of multiemployer plans to which ABF currently contributes |  |  |  |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44 |  |  |  |  |
Maximum required increase in employer's contribution to multiemployer plans that enter reorganization status (as a percent) |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum funded percentage of plans in red zone |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum funded percentage of plans in yellow zone |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum funded percentage of plans in green zone |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension period for the plan's funding improvement or rehabilitation period of plans in endangered or critical status |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total contributions to multiemployer plans |  |  |  |  |  | $ 131,895 | $ 132,841 | $ 120,613 | $ 68,683 | $ 70,579 | $ 65,091 |  |  |  |  |  |  |  |  |  | $ 20,774 | $ 20,807 | $ 18,268 | $ 11,170 | $ 12,022 | $ 10,827 |  |  | $ 9,567 | $ 9,265 | $ 8,207 |  |  |  | $ 113,000 | $ 112,100 | $ 103,100 | $ 21,701 | $ 20,168 | $ 18,220
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 |  |  | 0.023 | 0.036 | 0.096 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.053 | 0.041 | 0.038 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  | 53.90% | 63.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of extension granted by Internal Revenue Service for amortization of unfunded liabilities |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of additional surcharge that could be imposed if contribution rates in the collective bargaining agreement fail to meet the requirements for underfunded plans | 10.00% | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Represents the funded percentage of a specified multiemployer pension plan. + References No definition available. + Details
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X
- Definition Represents the period of extension under the Recovery Act for funding improvement or rehabilitation of the multiemployer plans that are in endangered or critical status for plan years beginning in 2008 or 2009. + 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 minimum funded percentage of plans in the green zone. + References No definition available. + Details
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- Definition Represents the percentage of additional surcharge that could be imposed by the PPA if the contribution rate in the collective bargaining agreement fails to meet the requirements established by the rehabilitation or funding improvement 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 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 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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