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INCOME TAXES (Details 3) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Deferred tax assets for nonunion defined benefit pension liabilities
Dec. 31, 2011
Deferred tax assets for nonunion defined benefit pension liabilities
Jun. 15, 2012
Federal
Panther Expedited Services, Inc.
Dec. 31, 2012
Foreign
Dec. 31, 2012
Foreign
Minimum
Dec. 31, 2012
Foreign
Maximum
Dec. 31, 2012
State
Dec. 31, 2012
State
Minimum
Dec. 31, 2012
State
Maximum
Dec. 31, 2012
State
Net operating loss and deferred tax assets
Jun. 15, 2012
State
Panther Expedited Services, Inc.
Jun. 15, 2012
State
Panther Expedited Services, Inc.
Minimum
Jun. 15, 2012
State
Panther Expedited Services, Inc.
Maximum
INCOME TAXES                                
Income taxes paid before income tax refunds $ 5,300,000 $ 5,200,000 $ 4,700,000                          
Income tax refunds 7,100,000 4,600,000 35,700,000                          
Operating loss and contribution carryforwards                                
Operating loss carryforwards           20,000,000       89,900,000       16,000,000    
Contribution carryovers                   1,100,000            
State net operating loss and contribution carryovers expiration period                     5 years 20 years        
Majority of state net operating loss and contribution carryovers, expiration period one                   15 years            
Majority of state net operating loss and contribution carryovers, expiration period two                   20 years            
Net operating loss carryovers expiration period           20 years                 5 years 20 years
Valuation allowance 2,511,000 5,644,000     4,000,000               1,500,000      
Valuation allowance related tax credit carryovers             600,000                  
Valuation allowance related to net operating loss carryovers             300,000                  
Foreign tax credit carryovers, expiration period               6 years 10 years              
Change in valuation allowance $ (3,200,000)     $ (4,000,000)                 $ 800,000