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Acquisitions (Narrative) (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
Dec. 31, 2009
Mar. 31, 2011
Oct. 03, 2011
Challenge Transport Inc [Member]
Jun. 03, 2011
Domestic Transport Inc. [Member]
Dec. 31, 2011
ETS [Member]
Sep. 30, 2011
ETS [Member]
Jun. 30, 2011
ETS [Member]
Dec. 31, 2011
Mode [Member]
Dec. 31, 2011
Agency/Customer Relationships [Member]
Oct. 03, 2011
Customer Relationships [Member]
Challenge Transport Inc [Member]
Oct. 03, 2011
Driver Relationships [Member]
Challenge Transport Inc [Member]
Business Acquisition [Line Items]                          
Date of acquisition         October 3, 2011 June 3, 2011     April 1, 2011        
Purchase price, stock                 $ 83,400,000        
Purchase price       82,187,000 2,500,000 700,000     90,100,000        
Business acquisition cash on hand                 8,000,000        
Working capital adjustment               7,900,000          
Purchase price after working capital adjustment             82,200,000            
Costs incurred prior to the acquisition 1,700,000                        
Number of independent business owners                   97      
Number of sales agents                   128      
Integration costs 1,600,000                        
Goodwill amortization period (years) 15                        
Amortization expense related to acquisition 1,300,000 500,000 400,000               600,000    
Number of drivers         41 22              
Number of installment payments         4 4              
Initial installment payment         2,000,000 600,000              
Subsequent installment payments         125,000 25,000              
Purchase price allocation, driver and customer relationships           100,000           1,300,000 300,000
Purchase price allocation, tractors           200,000              
Purchase price allocation, goodwill       29,389,000 900,000 400,000              
Tax deductible goodwill 25,800,000                        
Assumed liabilities $ 4,700,000