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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Product Information [Line Items] |  |  |  |
Total net external sales | $ 612,690 | $ 435,903 | $ 1,104,009 | $ 798,619
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 | $ (5,111) | $ (3,064) | $ (11,876) | $ (5,047)
Commercial Trailer Products |  |  |  |
Product Information [Line Items] |  |  |  |
Total net external sales | 402,507 | 348,140 | 729,929 | 622,929
Diversified Products |  |  |  |
Product Information [Line Items] |  |  |  |
Total net external sales | 94,085 | 90,827 | 189,288 | 180,737
Final Mile Products |  |  |  |
Product Information [Line Items] |  |  |  |
Total net external sales | 121,209 | 0 | 196,668 | 0
New Trailers |  |  |  |
Product Information [Line Items] |  |  |  |
Total net external sales | $ 422,733 | $ 362,695 | $ 766,890 | $ 650,580
New Trailers | Sales Revenue, Net |  |  |  |
Product Information [Line Items] |  |  |  |
Percentage of consolidated net sales | 69.00% | 83.20% | 69.50% | 81.50%
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 | 385,131 | 329,405 | 695,449 | 586,595
New Trailers | Diversified Products |  |  |  |
Product Information [Line Items] |  |  |  |
Total net external sales | 37,602 | 33,290 | 71,441 | 63,985
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 | $ 3,127 | $ 1,873 | $ 8,620 | $ 3,979
Used Trailers | Sales Revenue, Net |  |  |  |
Product Information [Line Items] |  |  |  |
Percentage of consolidated net sales | 0.50% | 0.40% | 0.80% | 0.50%
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 | 2,499 | 1,236 | 6,906 | 2,123
Used Trailers | Diversified Products |  |  |  |
Product Information [Line Items] |  |  |  |
Total net external sales | 628 | 637 | 1,714 | 1,856
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 | $ 38,500 | $ 42,232 | $ 76,767 | $ 86,667
Components, parts and service | Sales Revenue, Net |  |  |  |
Product Information [Line Items] |  |  |  |
Percentage of consolidated net sales | 6.30% | 9.70% | 7.00% | 10.90%
Components, parts and service | Corporate and Eliminations |  |  |  |
Product Information [Line Items] |  |  |  |
Total net external sales | $ (5,091) | $ (3,064) | $ (11,853) | $ (5,047)
Components, parts and service | Commercial Trailer Products |  |  |  |
Product Information [Line Items] |  |  |  |
Total net external sales | 9,042 | 13,102 | 17,690 | 25,845
Components, parts and service | Diversified Products |  |  |  |
Product Information [Line Items] |  |  |  |
Total net external sales | 31,926 | 32,194 | 65,894 | 65,869
Components, parts and service | Final Mile Products |  |  |  |
Product Information [Line Items] |  |  |  |
Total net external sales | 2,623 | 0 | 5,036 | 0
Equipment and other |  |  |  |
Product Information [Line Items] |  |  |  |
Total net external sales | $ 148,330 | $ 29,103 | $ 251,732 | $ 57,393
Equipment and other | Sales Revenue, Net |  |  |  |
Product Information [Line Items] |  |  |  |
Percentage of consolidated net sales | 24.20% | 6.70% | 22.70% | 7.10%
Equipment and other | Corporate and Eliminations |  |  |  |
Product Information [Line Items] |  |  |  |
Total net external sales | $ (20) | $ 0 | $ (23) | $ 0
Equipment and other | Commercial Trailer Products |  |  |  |
Product Information [Line Items] |  |  |  |
Total net external sales | 5,835 | 4,398 | 9,884 | 8,367
Equipment and other | Diversified Products |  |  |  |
Product Information [Line Items] |  |  |  |
Total net external sales | 23,929 | 24,705 | 50,239 | 49,026
Equipment and other | Final Mile Products |  |  |  |
Product Information [Line Items] |  |  |  |
Total net external sales | $ 118,586 | $ 0 | $ 191,632 | $ 0

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