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Note 7 - Segment Information (Details) - Segment Reporting Information (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]          
Revenues from external customers, by segment $ 1,241,022 $ 913,064 $ 3,382,150 $ 2,459,526  
Segment income (loss) from continuing operations before taxes, by segment 38,329 25,089 90,333 56,498  
Segment assets, by segment 2,456,612 2,045,530 2,456,612 2,045,530 2,167,798
Truck Segment [Member]
          
Segment Reporting Information [Line Items]          
Revenues from external customers, by segment 1,236,101 907,903 3,368,037 2,445,151  
Segment income (loss) from continuing operations before taxes, by segment 38,366 25,149 90,459 56,685  
Segment assets, by segment 2,426,368 2,016,725 2,426,368 2,016,725  
Other Segments [Member]
          
Segment Reporting Information [Line Items]          
Revenues from external customers, by segment 4,921 5,161 14,113 14,375  
Segment income (loss) from continuing operations before taxes, by segment (37) (60) (126) (187)  
Segment assets, by segment $ 30,244 $ 28,806 $ 30,244 $ 28,806