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Major Product Categories and Percentage of Consolidated Net Sales (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Product Information [Line Items]    
Total Net Sales $ 362,716 $ 447,676
Sales Revenue, Net    
Product Information [Line Items]    
Percentage of consolidated net sales 100.00% 100.00%
Corporate and Eliminations    
Product Information [Line Items]    
Total Net Sales $ (1,983) $ (2,653)
Commercial Trailer Products    
Product Information [Line Items]    
Total Net Sales 274,789 364,040
Diversified Products    
Product Information [Line Items]    
Total Net Sales 89,910 86,289
New Trailers    
Product Information [Line Items]    
Total Net Sales $ 287,885 $ 371,809
New Trailers | Sales Revenue, Net    
Product Information [Line Items]    
Percentage of consolidated net sales 79.40% 83.10%
New Trailers | Corporate and Eliminations    
Product Information [Line Items]    
Total Net Sales $ 0 $ 0
New Trailers | Commercial Trailer Products    
Product Information [Line Items]    
Total Net Sales 257,190 342,033
New Trailers | Diversified Products    
Product Information [Line Items]    
Total Net Sales 30,695 29,776
Used Trailers    
Product Information [Line Items]    
Total Net Sales $ 2,106 $ 4,753
Used Trailers | Sales Revenue, Net    
Product Information [Line Items]    
Percentage of consolidated net sales 0.60% 1.10%
Used Trailers | Corporate and Eliminations    
Product Information [Line Items]    
Total Net Sales $ 0 $ 0
Used Trailers | Commercial Trailer Products    
Product Information [Line Items]    
Total Net Sales 887 3,852
Used Trailers | Diversified Products    
Product Information [Line Items]    
Total Net Sales 1,219 901
Components, parts and service    
Product Information [Line Items]    
Total Net Sales $ 44,435 $ 38,938
Components, parts and service | Sales Revenue, Net    
Product Information [Line Items]    
Percentage of consolidated net sales 12.30% 8.70%
Components, parts and service | Corporate and Eliminations    
Product Information [Line Items]    
Total Net Sales $ (1,983) $ (2,653)
Components, parts and service | Commercial Trailer Products    
Product Information [Line Items]    
Total Net Sales 12,743 14,203
Components, parts and service | Diversified Products    
Product Information [Line Items]    
Total Net Sales 33,675 27,388
Equipment and other    
Product Information [Line Items]    
Total Net Sales $ 28,290 $ 32,176
Equipment and other | Sales Revenue, Net    
Product Information [Line Items]    
Percentage of consolidated net sales 7.70% 7.10%
Equipment and other | Corporate and Eliminations    
Product Information [Line Items]    
Total Net Sales $ 0 $ 0
Equipment and other | Commercial Trailer Products    
Product Information [Line Items]    
Total Net Sales 3,969 3,952
Equipment and other | Diversified Products    
Product Information [Line Items]    
Total Net Sales $ 24,321 $ 28,224