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Claims Accruals (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Claims Accruals [Line Items]    
Claims accrual $ 194,051 $ 185,506
Less: current portion 75,469 86,587
Long-term claim accruals 118,582 98,919
Auto And Collision Liability [Member]
   
Claims Accruals [Line Items]    
Claims accrual 102,462 93,798
Workers Compensation Liability [Member]
   
Claims Accruals [Line Items]    
Claims accrual 70,145 64,237
Owner Operator Claims Liability [Member]
   
Claims Accruals [Line Items]    
Claims accrual 8,610 13,402
Group Medical Liability [Member]
   
Claims Accruals [Line Items]    
Claims accrual 9,946 11,709
Cargo Damage Liability [Member]
   
Claims Accruals [Line Items]    
Claims accrual $ 2,888 $ 2,360