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Fair Value Measurements (Details 1) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2014
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2014
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Trucks [Member]
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Trucks [Member]
Jun. 30, 2014
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Trucks [Member]
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Trucks [Member]
Jun. 30, 2014
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Tractors [Member]
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Tractors [Member]
Jun. 30, 2014
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Tractors [Member]
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Tractors [Member]
Jun. 30, 2014
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Trailers [Member]
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Trailers [Member]
Jun. 30, 2014
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Trailers [Member]
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Revenue earning equipment, Trailers [Member]
Jun. 30, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Revenue earning equipment, Trucks [Member]
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Revenue earning equipment, Trucks [Member]
Jun. 30, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Revenue earning equipment, Tractors [Member]
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Revenue earning equipment, Tractors [Member]
Jun. 30, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Revenue earning equipment, Trailers [Member]
Jun. 30, 2013
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Revenue earning equipment, Trailers [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis                                                    
Assets held for sale at fair value                                     $ 17,267,000 $ 28,297,000 $ 10,713,000 $ 11,132,000 $ 6,057,000 $ 16,283,000 $ 497,000 $ 882,000
Total Losses     2,515,000 4,230,000 6,190,000 8,951,000 1,572,000 2,447,000 3,454,000 5,476,000 662,000 1,413,000 2,294,000 2,508,000 281,000 370,000 442,000 967,000                
Fair Value Measurements (Textuals) (Abstract)                                                    
Fair value of total debt $ 4,830,000,000 $ 4,280,000,000