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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Maximum
Dec. 31, 2011
Maximum
Dec. 31, 2010
Maximum
Dec. 31, 2012
Accounts receivable securitization program
Dec. 31, 2012
Letter of Credit Agreements
Dec. 31, 2011
Letter of Credit Agreements
Dec. 31, 2012
Surety bonds
Dec. 31, 2011
Surety bonds
Dec. 31, 2012
Credit Agreement
Dec. 31, 2012
Revolving commitments
Jun. 15, 2012
Term Loan
Dec. 31, 2012
Notes payable
Dec. 31, 2012
Notes payable
Revenue Equipment
ABF
Dec. 31, 2011
Notes payable
Revenue Equipment
ABF
Dec. 31, 2012
Capital lease obligations
Dec. 31, 2011
Capital lease obligations
Revenue Equipment
ABF
Dec. 31, 2010
Capital lease obligations
Revenue Equipment
ABF
Dec. 31, 2010
Capital lease obligations
Total Equipment
ABF
Financing Arrangements                                          
Debt instrument, term                           5 years   36 months 36 months        
Term of capital lease agreements                                     36 months 36 months  
Term of first additional capital lease agreement                                         36 months
Term of second additional capital lease agreement                                         60 months
Revenue equipment financed during the period under notes payable or capital lease agreements                               $ 38,000,000 $ 28,500,000   $ 1,900,000 $ 11,400,000 $ 36,300,000
Weighted-average interest rate (as a percent) 2.60%                           3.00%     4.50%      
Interest paid, net of capitalized interest 4,500,000 3,300,000 2,600,000                                    
Capitalized interest       100,000 100,000 100,000                              
Face amount of term loan                           100,000,000              
Maximum borrowing capacity             75,000,000           75,000,000                
Fixed charge coverage ratio                       1.5                  
Minimum fixed charge coverage ratio required to be maintained                       1.25                  
Outstanding letters of credit             16,200,000 22,700,000 46,200,000                        
Outstanding surety bonds under collateralized bond program                   13,800,000 13,800,000                    
Amounts collateralized by restricted funds 9,658,000 52,693,000           5,900,000 45,700,000 3,800,000 7,000,000                    
Reduction in amounts collateralized by restricted funds under letters of credit transferred to uncollateralized bond programs               26,100,000                          
Outstanding surety bonds under uncollateralized bond programs                   36,600,000                      
Remaining borrowing capacity             58,800,000 69,100,000                          
Period prior to expiration of the collective bargaining agreement upon which the available liquidity requirement is triggered if no new agreement is in place             7 days                            
Available liquidity required to be maintained if new collective bargaining agreement is not in place seven days prior to expiration of current agreement             $ 50,000,000