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Major Product Categories and Percentage of Consolidated Net Sales (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Product Information [Line Items]        
Total Net Sales $ 435,903 $ 471,438 $ 798,619 $ 919,114
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 $ (3,064) $ (3,644) $ (5,047) $ (6,297)
Commercial Trailer Products        
Product Information [Line Items]        
Total Net Sales 348,140 382,212 622,929 746,252
Diversified Products        
Product Information [Line Items]        
Total Net Sales 90,827 92,870 180,737 179,159
New Trailers        
Product Information [Line Items]        
Total Net Sales $ 362,695 $ 393,992 $ 650,580 $ 765,801
New Trailers | Sales Revenue, Net        
Product Information [Line Items]        
Percentage of consolidated net sales 83.20% 83.60% 81.50% 83.30%
New Trailers | Corporate and Eliminations        
Product Information [Line Items]        
Total Net Sales $ 0 $ 0 $ 0 $ 0
New Trailers | Commercial Trailer Products        
Product Information [Line Items]        
Total Net Sales 329,405 359,763 586,595 701,796
New Trailers | Diversified Products        
Product Information [Line Items]        
Total Net Sales 33,290 34,229 63,985 64,005
Used Trailers        
Product Information [Line Items]        
Total Net Sales $ 1,873 $ 4,520 $ 3,979 $ 9,273
Used Trailers | Sales Revenue, Net        
Product Information [Line Items]        
Percentage of consolidated net sales 0.40% 1.00% 0.50% 1.00%
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 1,236 3,427 2,123 7,279
Used Trailers | Diversified Products        
Product Information [Line Items]        
Total Net Sales 637 1,093 1,856 1,994
Components, parts and service        
Product Information [Line Items]        
Total Net Sales $ 42,232 $ 43,183 $ 86,667 $ 82,118
Components, parts and service | Sales Revenue, Net        
Product Information [Line Items]        
Percentage of consolidated net sales 9.70% 9.20% 10.90% 8.90%
Components, parts and service | Corporate and Eliminations        
Product Information [Line Items]        
Total Net Sales $ (3,064) $ (3,644) $ (5,047) $ (6,297)
Components, parts and service | Commercial Trailer Products        
Product Information [Line Items]        
Total Net Sales 13,102 14,869 25,845 29,070
Components, parts and service | Diversified Products        
Product Information [Line Items]        
Total Net Sales 32,194 31,958 65,869 59,345
Equipment and other        
Product Information [Line Items]        
Total Net Sales $ 29,103 $ 29,743 $ 57,393 $ 61,922
Equipment and other | Sales Revenue, Net        
Product Information [Line Items]        
Percentage of consolidated net sales 6.70% 6.20% 7.10% 6.80%
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 4,398 4,153 8,367 8,107
Equipment and other | Diversified Products        
Product Information [Line Items]        
Total Net Sales $ 24,705 $ 25,590 $ 49,026 $ 53,815