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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details) (USD $)
 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Jun. 30, 2014
Multiemployer pension plans
ABF Freight
item
Jun. 30, 2014
Central States Pension Plan
ABF Freight
Jan. 02, 2013
Central States Pension Plan
ABF Freight
Jan. 31, 2014
Nonunion Defined Benefit Pension Plan
participant
Jun. 30, 2014
Nonunion Defined Benefit Pension Plan
Jun. 30, 2013
Nonunion Defined Benefit Pension Plan
Jun. 30, 2014
Nonunion Defined Benefit Pension Plan
Jun. 30, 2013
Nonunion Defined Benefit Pension Plan
Mar. 31, 2014
Nonunion Defined Benefit Pension Plan
Jan. 02, 2014
Nonunion Defined Benefit Pension Plan
Dec. 31, 2013
Nonunion Defined Benefit Pension Plan
Jun. 30, 2014
Supplemental Benefit Plan
Jun. 30, 2013
Supplemental Benefit Plan
Jun. 30, 2014
Supplemental Benefit Plan
Jun. 30, 2013
Supplemental Benefit Plan
Jun. 30, 2014
Postretirement Health Benefit Plan
Jun. 30, 2013
Postretirement Health Benefit Plan
Jun. 30, 2014
Postretirement Health Benefit Plan
Jun. 30, 2013
Postretirement Health Benefit Plan
Components of net periodic benefit cost                                          
Service cost               $ 2,367,000   $ 4,734,000               $ 70,000 $ 83,000 $ 140,000 $ 166,000
Interest cost             1,522,000 1,922,000 3,242,000 3,845,000       49,000 38,000 98,000 75,000 197,000 187,000 394,000 375,000
Expected return on plan assets             (2,605,000) (3,155,000) (5,436,000) (6,309,000)                      
Amortization of prior service credit                                   (48,000) (47,000) (95,000) (95,000)
Pension settlement expense   4,600,000         909,000   4,600,000                        
Amortization of net actuarial loss             636,000 2,714,000 1,134,000 5,427,000       57,000 65,000 113,000 130,000 23,000 133,000 46,000 267,000
Net periodic benefit cost             462,000 3,848,000 3,540,000 7,697,000       106,000 103,000 211,000 205,000 242,000 356,000 485,000 713,000
Number of plan participants for which vested pension benefits were settled           375                              
Premium paid to purchase nonparticipating annuity contract           25,400,000                              
Pension benefit obligation settled with nonparticipating annuity contract           23,300,000                              
Defined Benefit Plan Lump Sum Distribution Paid             8,400,000   22,500,000                        
Pension settlement expense, net of tax 556,000 2,811,000         600,000   2,800,000                        
Unrecognized net actuarial loss             19,200,000   19,200,000                        
Amortization period for unrecognized net actuarial loss                 8 years                        
Change in projected benefit obligation                                          
Projected benefit obligation at the beginning of the period           211,660,000     211,660,000                        
Interest cost             1,522,000 1,922,000 3,242,000 3,845,000       49,000 38,000 98,000 75,000 197,000 187,000 394,000 375,000
Actuarial loss                 10,713,000                        
Benefits paid                 (48,284,000)                        
Projected benefit obligation at the end of the period             177,331,000   177,331,000                        
Changes in plan assets                                          
Fair value of plan assets at beginning of period           207,613,000     207,613,000                        
Actual return on plan assets                 7,184,000                        
Benefits paid                 (48,284,000)                        
Fair value of plan assets at end of period             166,513,000   166,513,000                        
Funded status             (10,818,000)   (10,818,000)                        
Accumulated benefit obligation             177,331,000   177,331,000                        
Discount rate (as a percent)             3.30%   3.30%   3.50%   3.80%                
Employer contributions                 $ 0                        
Adjusted funding target attainment percentage                       108.00%                  
Multiemployer Plans                                          
Number of multiemployer plans to which ABF Freight currently contributes     25                                    
Maximum required increase in employer's contribution to multiemployer plans that enter reorganization status (as a percent)     7.00%                                    
Approximate proportion of multiemployer pension plan contributions made to Central States Pension Fund (as a percent)       50.00%                                  
Actuarially certified funded percentage of multiemployer pension plan         47.60%