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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2014
person
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Jun. 30, 2015
USD ($)
plan
Jun. 30, 2014
USD ($)
Mar. 31, 2015
Jan. 01, 2015
Dec. 31, 2014
Jan. 01, 2014
Components of net periodic benefit cost                    
Pension settlement expense   $ 600 $ 900   $ 1,716 $ 4,600        
Pension settlement expense, net of tax   364 556   $ 1,048 2,811        
Multiemployer pension plans | Freight Transportation (ABF Freight)                    
Multiemployer Plans                    
Number of multiemployer plans to which ABF Freight currently contributes | plan         25          
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%          
Multiemployer pension plans | Central States Pension Plan | Freight Transportation (ABF Freight)                    
Multiemployer Plans                    
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                   48.40%
Nonunion Defined Benefit Pension Plan                    
Components of net periodic benefit cost                    
Interest cost   1,223 1,522   $ 2,543 3,242        
Expected return on plan assets   (2,359) (2,605)   (4,761) (5,436)        
Pension settlement expense   597 909   1,716 4,600        
Amortization of net actuarial loss   815 636   1,636 1,134        
Net periodic benefit cost   276 462   1,134 3,540        
Number of plan participants for which vested pension benefits were settled | person 375                  
Pension settlement expense, net of tax   400 600   1,000 2,800        
Premium paid to purchase nonparticipating annuity contract       $ 25,400            
Lump-sum distributions   4,800 8,400   $ 12,400 22,500        
Amortization period for unrecognized net actuarial loss         8 years          
Change in projected benefit obligation                    
Projected benefit obligation at the beginning of the period         $ 174,410          
Interest cost   1,223 1,522   2,543 3,242        
Actuarial gain         (1,971)          
Benefits paid         (12,562)          
Projected benefit obligation at the end of the period   162,420     162,420          
Change in plan assets                    
Fair value of plan assets at beginning of period         158,265          
Actual return on plan assets         3,687          
Employer contributions         50          
Benefits paid         (12,562)          
Fair value of plan assets at end of period   149,440     149,440          
Funded status   (12,980)     (12,980)          
Accumulated benefit obligation   $ 162,420     $ 162,420          
Discount rate (as a percent)   3.50%     3.50%   3.00%   3.20%  
Adjusted funding target attainment percentage               108.50%    
Supplemental Benefit Plan                    
Components of net periodic benefit cost                    
Interest cost   $ 30 49   $ 61 98        
Amortization of net actuarial loss   40 57   80 113        
Net periodic benefit cost   70 106   141 211        
Change in projected benefit obligation                    
Interest cost   30 49   61 98        
Postretirement Health Benefit Plan                    
Components of net periodic benefit cost                    
Service cost   102 70   203 140        
Interest cost   229 197   457 394        
Amortization of prior service credit   (48) (48)   (95) (95)        
Amortization of net actuarial loss   213 23   426 46        
Net periodic benefit cost   496 242   991 485        
Change in projected benefit obligation                    
Interest cost   $ 229 $ 197   $ 457 $ 394