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General - Additional Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Revenue earning equipment, net $ 7,854,037 $ 7,409,529 $ 7,201,886 $ 6,592,826
Adjustment [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Revenue earning equipment, net   $ 201,200 $ 207,438 $ 102,000