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Major Product Categories and Percentage of Consolidated Net Sales (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Product Information [Line Items]        
Net external sales $ 362,408 $ 287,095 $ 640,090 $ 509,079
Percentage of consolidated net sales 100.00% 100.00% 100.00% 100.00%
Commercial Trailer Products
       
Product Information [Line Items]        
Net external sales 263,350 236,955 496,910 422,635
Diversified Products
       
Product Information [Line Items]        
Net external sales 65,712 13,745 84,714 23,353
Retail
       
Product Information [Line Items]        
Net external sales 33,346 36,395 58,466 63,091
Product concentration | New Trailers
       
Product Information [Line Items]        
Net external sales 293,063 251,649 528,253 447,804
Percentage of consolidated net sales 80.90% 87.70% 82.50% 88.00%
Product concentration | Used Trailers
       
Product Information [Line Items]        
Net external sales 9,412 6,128 16,997 11,088
Percentage of consolidated net sales 2.60% 2.10% 2.70% 2.20%
Product concentration | Components, parts and service
       
Product Information [Line Items]        
Net external sales 37,450 26,842 64,028 47,247
Percentage of consolidated net sales 10.30% 9.30% 10.00% 9.30%
Product concentration | Equipment and other
       
Product Information [Line Items]        
Net external sales 22,483 2,476 30,812 2,940
Percentage of consolidated net sales 6.20% 0.90% 4.80% 0.50%
Product concentration | Commercial Trailer Products | New Trailers
       
Product Information [Line Items]        
Net external sales 255,543 231,091 480,842 413,679
Product concentration | Commercial Trailer Products | Used Trailers
       
Product Information [Line Items]        
Net external sales 4,825 3,062 8,973 5,375
Product concentration | Commercial Trailer Products | Components, parts and service
       
Product Information [Line Items]        
Net external sales 814 1,035 1,373 1,590
Product concentration | Commercial Trailer Products | Equipment and other
       
Product Information [Line Items]        
Net external sales 2,168 1,767 5,722 1,991
Product concentration | Diversified Products | New Trailers
       
Product Information [Line Items]        
Net external sales 21,007   21,007  
Product concentration | Diversified Products | Used Trailers
       
Product Information [Line Items]        
Net external sales 293   293  
Product concentration | Diversified Products | Components, parts and service
       
Product Information [Line Items]        
Net external sales 24,121 13,060 38,371 22,451
Product concentration | Diversified Products | Equipment and other
       
Product Information [Line Items]        
Net external sales 20,291 685 25,043 902
Product concentration | Retail | New Trailers
       
Product Information [Line Items]        
Net external sales 16,513 20,558 26,404 34,125
Product concentration | Retail | Used Trailers
       
Product Information [Line Items]        
Net external sales 4,294 3,066 7,731 5,713
Product concentration | Retail | Components, parts and service
       
Product Information [Line Items]        
Net external sales 12,515 12,747 24,284 23,206
Product concentration | Retail | Equipment and other
       
Product Information [Line Items]        
Net external sales $ 24 $ 24 $ 47 $ 47