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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

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