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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Product Information [Line Items]        
Total net external sales $ 553,073 $ 425,098 $ 1,657,082 $ 1,223,717
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 external sales $ (4,679) $ (3,244) $ (16,555) $ (8,291)
Commercial Trailer Products        
Product Information [Line Items]        
Total net external sales 368,342 339,492 1,098,271 962,421
Diversified Products        
Product Information [Line Items]        
Total net external sales 102,361 88,850 291,649 269,587
Final Mile Products        
Product Information [Line Items]        
Total net external sales 87,049 0 283,717 0
New Trailers        
Product Information [Line Items]        
Total net external sales $ 398,402 $ 354,688 $ 1,165,292 $ 1,005,268
New Trailers | Sales Revenue, Net        
Product Information [Line Items]        
Percentage of consolidated net sales 72.00% 83.40% 70.30% 82.10%
New Trailers | Corporate and Eliminations        
Product Information [Line Items]        
Total net external sales $ 0 $ 0 $ 0 $ 0
New Trailers | Commercial Trailer Products        
Product Information [Line Items]        
Total net external sales 354,003 319,463 1,049,452 906,058
New Trailers | Diversified Products        
Product Information [Line Items]        
Total net external sales 44,399 35,225 115,840 99,210
New Trailers | Final Mile Products        
Product Information [Line Items]        
Total net external sales 0 0 0 0
Used Trailers        
Product Information [Line Items]        
Total net external sales $ 2,663 $ 3,846 $ 11,283 $ 7,825
Used Trailers | Sales Revenue, Net        
Product Information [Line Items]        
Percentage of consolidated net sales 0.50% 0.90% 0.70% 0.60%
Used Trailers | Corporate and Eliminations        
Product Information [Line Items]        
Total net external sales $ 0 $ 0 $ 0 $ 0
Used Trailers | Commercial Trailer Products        
Product Information [Line Items]        
Total net external sales 1,888 3,245 8,794 5,368
Used Trailers | Diversified Products        
Product Information [Line Items]        
Total net external sales 775 601 2,489 2,457
Used Trailers | Final Mile Products        
Product Information [Line Items]        
Total net external sales 0 0 0 0
Components, parts and service        
Product Information [Line Items]        
Total net external sales $ 34,782 $ 36,892 $ 111,549 $ 123,559
Components, parts and service | Sales Revenue, Net        
Product Information [Line Items]        
Percentage of consolidated net sales 6.30% 8.70% 6.70% 10.10%
Components, parts and service | Corporate and Eliminations        
Product Information [Line Items]        
Total net external sales $ (4,676) $ (3,244) $ (16,529) $ (8,291)
Components, parts and service | Commercial Trailer Products        
Product Information [Line Items]        
Total net external sales 8,090 12,255 25,780 38,100
Components, parts and service | Diversified Products        
Product Information [Line Items]        
Total net external sales 29,064 27,881 94,958 93,750
Components, parts and service | Final Mile Products        
Product Information [Line Items]        
Total net external sales 2,304 0 7,340 0
Equipment and other        
Product Information [Line Items]        
Total net external sales $ 117,226 $ 29,672 $ 368,958 $ 87,065
Equipment and other | Sales Revenue, Net        
Product Information [Line Items]        
Percentage of consolidated net sales 21.20% 7.00% 22.30% 7.20%
Equipment and other | Corporate and Eliminations        
Product Information [Line Items]        
Total net external sales $ (3) $ 0 $ (26) $ 0
Equipment and other | Commercial Trailer Products        
Product Information [Line Items]        
Total net external sales 4,361 4,529 14,245 12,895
Equipment and other | Diversified Products        
Product Information [Line Items]        
Total net external sales 28,123 25,143 78,362 74,170
Equipment and other | Final Mile Products        
Product Information [Line Items]        
Total net external sales $ 84,745 $ 0 $ 276,377 $ 0