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Fair Value Measurements (Details 1) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Trucks [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Trucks [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Tractors [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Tractors [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Trailers [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Trailers [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 1 [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Level 1 [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 1 [Member]
Revenue earning equipment, Trucks [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Level 1 [Member]
Revenue earning equipment, Trucks [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 1 [Member]
Revenue earning equipment, Tractors [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Level 1 [Member]
Revenue earning equipment, Tractors [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 1 [Member]
Revenue earning equipment, Trailers [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Level 1 [Member]
Revenue earning equipment, Trailers [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 2 [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Level 2 [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 2 [Member]
Revenue earning equipment, Trucks [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Level 2 [Member]
Revenue earning equipment, Trucks [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 2 [Member]
Revenue earning equipment, Tractors [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Level 2 [Member]
Revenue earning equipment, Tractors [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 2 [Member]
Revenue earning equipment, Trailers [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Level 2 [Member]
Revenue earning equipment, Trailers [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Revenue earning equipment, Trucks [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Revenue earning equipment, Trucks [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Revenue earning equipment, Tractors [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Revenue earning equipment, Tractors [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Revenue earning equipment, Trailers [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Revenue earning equipment, Trailers [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis                                                                      
Assets held for sale at fair value                       $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 26,467,000 $ 9,483,000 $ 14,263,000 $ 6,147,000 $ 11,619,000 $ 3,040,000 $ 585,000 $ 296,000
Total Losses 23,000,000     18,400,000 8,891,000 12,853,000 5,556,000 4,058,000 1,982,000 1,489,000 1,353,000                                                
Fair Value Measurements (Textual) (Abstract)                                                                      
Fair value of total debt   3,990,000,000 3,510,000,000                                                                
Loss to reflect changes in fair value $ 23,000,000     $ 18,400,000 $ 8,891,000 $ 12,853,000 $ 5,556,000 $ 4,058,000 $ 1,982,000 $ 1,489,000 $ 1,353,000