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Note 7 - Segment Information (Detail) - Segment Reporting Information (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Revenues from external customers $ 745,133 $ 696,445 $ 2,358,306 $ 1,804,531  
Segment income (loss) from continuing operations before taxes 24,244 26,434 78,879 58,244  
Segment assets 1,862,928 1,485,178 1,862,928 1,485,178 1,717,701
Truck Segment [Member]
         
Revenues from external customers 740,392 691,469 2,344,073 1,791,099  
Segment income (loss) from continuing operations before taxes 24,704 26,875 79,521 59,481  
Segment assets 1,835,675 1,459,161 1,835,675 1,459,161  
All Other Segments [Member]
         
Revenues from external customers 4,741 4,976 14,233 13,432  
Segment income (loss) from continuing operations before taxes (460) (441) (642) (1,237)  
Segment assets $ 27,253 $ 26,017 $ 27,253 $ 26,017