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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Details 3) (USD $)
 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Maximum
Dec. 31, 2011
Maximum
Dec. 31, 2013
Accounts receivable securitization program
Dec. 31, 2013
Letter of Credit Agreements
Dec. 31, 2012
Letter of Credit Agreements
Dec. 31, 2013
Surety bonds
Dec. 31, 2012
Surety bonds
Dec. 31, 2013
Credit Agreement
Dec. 31, 2013
Revolving commitments
Jun. 15, 2012
Term Loan
Dec. 31, 2013
Notes payable
Dec. 31, 2012
Notes payable
Revenue Equipment
ABF Freight
Dec. 31, 2011
Notes payable
Revenue Equipment
ABF Freight
Dec. 31, 2013
Capital lease obligations
Dec. 31, 2011
Capital lease obligations
Revenue Equipment
ABF Freight
Dec. 31, 2013
Capital lease obligations
Equipment and Other
ABF Freight
Maximum
Financing Arrangements                                      
Weighted-average interest rate (as a percent) 2.10%                         3.00%     4.80%    
Interest paid, net of capitalized interest $ 3,600,000 $ 4,500,000 $ 3,300,000                                
Capitalized interest 100,000     100,000 100,000                            
Debt instrument, term                         5 years   36 months 36 months      
Face amount of term loan                         100,000,000.0            
Maximum borrowing capacity           75,000,000.0           75,000,000.0              
Amount outstanding           0           0              
Fixed charge coverage ratio                     2.21                
Minimum fixed charge coverage ratio required to be maintained                     1.25                
Term of capital lease agreements                                   36 months  
Equipment financed during the period under notes payable or capital lease agreements                             38,000,000 28,500,000   1,900,000 100,000
Outstanding letters of credit           20,300,000 22,800,000 22,700,000                      
Remaining borrowing capacity           54,700,000 58,100,000                        
Amounts collateralized by restricted funds 1,902,000 9,658,000         1,900,000 5,900,000   3,800,000                  
Outstanding surety bonds under collateralized bond program                 12,700,000 13,800,000                  
Letters of credit, outstanding amount used as collateral           3,800,000                          
Outstanding surety bonds under uncollateralized bond programs                 $ 43,800,000 $ 36,600,000