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Major Product Categories and Percentage of Consolidated Net Sales (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Product Information [Line Items]    
Total net external sales $ 491,319 $ 362,716
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 external sales $ (6,765) $ (1,983)
Commercial Trailer Products    
Product Information [Line Items]    
Total net external sales 327,422 274,789
Diversified Products    
Product Information [Line Items]    
Total net external sales 95,203 89,910
Final Mile Products    
Product Information [Line Items]    
Total net external sales 75,459 0
New Trailers    
Product Information [Line Items]    
Total net external sales $ 344,157 $ 287,885
New Trailers | Sales Revenue, Net    
Product Information [Line Items]    
Percentage of consolidated net sales 70.00% 79.40%
New Trailers | Corporate and Eliminations    
Product Information [Line Items]    
Total net external sales $ 0 $ 0
New Trailers | Commercial Trailer Products    
Product Information [Line Items]    
Total net external sales 310,318 257,190
New Trailers | Diversified Products    
Product Information [Line Items]    
Total net external sales 33,839 30,695
New Trailers | Final Mile Products    
Product Information [Line Items]    
Total net external sales 0 0
Used Trailers    
Product Information [Line Items]    
Total net external sales $ 5,493 $ 2,106
Used Trailers | Sales Revenue, Net    
Product Information [Line Items]    
Percentage of consolidated net sales 1.10% 0.60%
Used Trailers | Corporate and Eliminations    
Product Information [Line Items]    
Total net external sales $ 0 $ 0
Used Trailers | Commercial Trailer Products    
Product Information [Line Items]    
Total net external sales 4,407 887
Used Trailers | Diversified Products    
Product Information [Line Items]    
Total net external sales 1,086 1,219
Used Trailers | Final Mile Products    
Product Information [Line Items]    
Total net external sales 0 0
Components, parts and service    
Product Information [Line Items]    
Total net external sales $ 38,267 $ 44,435
Components, parts and service | Sales Revenue, Net    
Product Information [Line Items]    
Percentage of consolidated net sales 7.80% 12.30%
Components, parts and service | Corporate and Eliminations    
Product Information [Line Items]    
Total net external sales $ (6,762) $ (1,983)
Components, parts and service | Commercial Trailer Products    
Product Information [Line Items]    
Total net external sales 8,648 12,743
Components, parts and service | Diversified Products    
Product Information [Line Items]    
Total net external sales 33,968 33,675
Components, parts and service | Final Mile Products    
Product Information [Line Items]    
Total net external sales 2,413 0
Equipment and other    
Product Information [Line Items]    
Total net external sales $ 103,402 $ 28,290
Equipment and other | Sales Revenue, Net    
Product Information [Line Items]    
Percentage of consolidated net sales 21.10% 7.70%
Equipment and other | Corporate and Eliminations    
Product Information [Line Items]    
Total net external sales $ (3) $ 0
Equipment and other | Commercial Trailer Products    
Product Information [Line Items]    
Total net external sales 4,049 3,969
Equipment and other | Diversified Products    
Product Information [Line Items]    
Total net external sales 26,310 24,321
Equipment and other | Final Mile Products    
Product Information [Line Items]    
Total net external sales $ 73,046 $ 0