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Note 7 - Segment Information (Detail) - Segment Reporting Information (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Revenues from external customers $ 835,844 $ 661,982 $ 1,613,173 $ 1,108,086  
Segment income (loss) from continuing operations before taxes 28,559 20,190 54,635 31,810  
Segment assets 1,885,441 1,350,300 1,885,441 1,350,300 1,717,701
Truck Segment [Member]
         
Revenues from external customers 830,773 657,490 1,603,681 1,099,630  
Segment income (loss) from continuing operations before taxes 28,574 20,521 54,817 32,606  
Segment assets 1,858,045 1,324,548 1,858,045 1,324,548  
All Other Segments [Member]
         
Revenues from external customers 5,071 4,492 9,492 8,456  
Segment income (loss) from continuing operations before taxes (15) (331) (182) (796)  
Segment assets $ 27,396 $ 25,752 $ 27,396 $ 25,752