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Major Product Categories and Percentage of Consolidated Net Sales (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Product Information [Line Items]        
Total Net Sales $ 425,098 $ 464,272 $ 1,223,717 $ 1,383,387
Sales Revenue, Net        
Product Information [Line Items]        
Percentage of consolidated net sales 100.00% 100.00% 100.00% 100.00%
Corporate and Eliminations        
Product Information [Line Items]        
Total Net Sales $ (3,244) $ (3,692) $ (8,291) $ (9,989)
Commercial Trailer Products        
Product Information [Line Items]        
Total Net Sales 339,492 380,514 962,421 1,126,767
Diversified Products        
Product Information [Line Items]        
Total Net Sales 88,850 87,450 269,587 266,609
New Trailers        
Product Information [Line Items]        
Total Net Sales $ 354,688 $ 392,214 $ 1,005,268 $ 1,158,015
New Trailers | Sales Revenue, Net        
Product Information [Line Items]        
Percentage of consolidated net sales 83.40% 84.50% 82.10% 83.70%
New Trailers | Corporate and Eliminations        
Product Information [Line Items]        
Total Net Sales $ 0 $ (89) $ 0 $ (89)
New Trailers | Commercial Trailer Products        
Product Information [Line Items]        
Total Net Sales 319,463 360,023 906,058 1,061,819
New Trailers | Diversified Products        
Product Information [Line Items]        
Total Net Sales 35,225 32,280 99,210 96,285
Used Trailers        
Product Information [Line Items]        
Total Net Sales $ 3,846 $ 3,544 $ 7,825 $ 12,817
Used Trailers | Sales Revenue, Net        
Product Information [Line Items]        
Percentage of consolidated net sales 0.90% 0.80% 0.60% 0.90%
Used Trailers | Corporate and Eliminations        
Product Information [Line Items]        
Total Net Sales $ 0 $ 0 $ 0 $ 0
Used Trailers | Commercial Trailer Products        
Product Information [Line Items]        
Total Net Sales 3,245 2,923 5,368 10,202
Used Trailers | Diversified Products        
Product Information [Line Items]        
Total Net Sales 601 621 2,457 2,615
Components, parts and service        
Product Information [Line Items]        
Total Net Sales $ 36,892 $ 39,743 $ 123,559 $ 121,861
Components, parts and service | Sales Revenue, Net        
Product Information [Line Items]        
Percentage of consolidated net sales 8.70% 8.60% 10.10% 8.80%
Components, parts and service | Corporate and Eliminations        
Product Information [Line Items]        
Total Net Sales $ (3,244) $ (3,603) $ (8,291) $ (9,900)
Components, parts and service | Commercial Trailer Products        
Product Information [Line Items]        
Total Net Sales 12,255 14,038 38,100 43,108
Components, parts and service | Diversified Products        
Product Information [Line Items]        
Total Net Sales 27,881 29,308 93,750 88,653
Equipment and other        
Product Information [Line Items]        
Total Net Sales $ 29,672 $ 28,771 $ 87,065 $ 90,694
Equipment and other | Sales Revenue, Net        
Product Information [Line Items]        
Percentage of consolidated net sales 7.00% 6.10% 7.20% 6.60%
Equipment and other | Corporate and Eliminations        
Product Information [Line Items]        
Total Net Sales $ 0 $ 0 $ 0 $ 0
Equipment and other | Commercial Trailer Products        
Product Information [Line Items]        
Total Net Sales 4,529 3,530 12,895 11,638
Equipment and other | Diversified Products        
Product Information [Line Items]        
Total Net Sales $ 25,143 $ 25,241 $ 74,170 $ 79,056