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Major Product Categories and Percentage of Consolidated Net Sales (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Product Information [Line Items] |  |  |
Total net sales | $ 2,027,489 | $ 1,863,315 | $ 1,635,686
Sales Revenue, Net [Member] |  |  |
Product Information [Line Items] |  |  |
Percentage of consolidated net sales | 100.00% | 100.00% | 100.00%
Corporate and Eliminations |  |  |
Product Information [Line Items] |  |  |
Total net sales | $ (77,203) | $ (87,167) | $ (86,909)
Commercial Trailer Products |  |  |
Product Information [Line Items] |  |  |
Total net sales | 1,509,380 | 1,294,164 | 1,082,456
Diversified Products |  |  |
Product Information [Line Items] |  |  |
Total net sales | 428,021 | 466,238 | 458,653
Retail |  |  |
Product Information [Line Items] |  |  |
Total net sales | 167,291 | 190,080 | 181,486
New Trailers |  |  |
Product Information [Line Items] |  |  |
Total net sales | $ 1,692,229 | $ 1,493,825 | $ 1,246,923
New Trailers | Sales Revenue, Net [Member] |  |  |
Product Information [Line Items] |  |  |
Percentage of consolidated net sales | 83.50% | 73.70% | 66.90%
New Trailers | Corporate and Eliminations |  |  |
Product Information [Line Items] |  |  |
Total net sales | $ (60,467) | $ (72,862) | $ (71,888)
New Trailers | Commercial Trailer Products |  |  |
Product Information [Line Items] |  |  |
Total net sales | 1,467,029 | 1,250,264 | 1,031,004
New Trailers | Diversified Products |  |  |
Product Information [Line Items] |  |  |
Total net sales | 218,028 | 227,382 | 204,812
New Trailers | Retail |  |  |
Product Information [Line Items] |  |  |
Total net sales | 67,639 | 89,041 | 82,995
Used Trailers |  |  |
Product Information [Line Items] |  |  |
Total net sales | $ 35,580 | $ 45,115 | $ 49,415
Used Trailers | Sales Revenue, Net [Member] |  |  |
Product Information [Line Items] |  |  |
Percentage of consolidated net sales | 1.80% | 2.20% | 2.70%
Used Trailers | Corporate and Eliminations |  |  |
Product Information [Line Items] |  |  |
Total net sales | $ (2,562) | $ 0 | $ (5)
Used Trailers | Commercial Trailer Products |  |  |
Product Information [Line Items] |  |  |
Total net sales | 19,962 | 23,576 | 33,443
Used Trailers | Diversified Products |  |  |
Product Information [Line Items] |  |  |
Total net sales | 4,558 | 4,593 | 3,158
Used Trailers | Retail |  |  |
Product Information [Line Items] |  |  |
Total net sales | 13,622 | 16,946 | 12,819
Components, parts and service |  |  |
Product Information [Line Items] |  |  |
Total net sales | $ 168,550 | $ 170,589 | $ 180,326
Components, parts and service | Sales Revenue, Net [Member] |  |  |
Product Information [Line Items] |  |  |
Percentage of consolidated net sales | 8.30% | 8.40% | 9.70%
Components, parts and service | Corporate and Eliminations |  |  |
Product Information [Line Items] |  |  |
Total net sales | $ (14,116) | $ (14,183) | $ (14,811)
Components, parts and service | Commercial Trailer Products |  |  |
Product Information [Line Items] |  |  |
Total net sales | 6,300 | 3,475 | 7,420
Components, parts and service | Diversified Products |  |  |
Product Information [Line Items] |  |  |
Total net sales | 93,251 | 100,764 | 106,312
Components, parts and service | Retail |  |  |
Product Information [Line Items] |  |  |
Total net sales | 83,115 | 80,533 | 81,405
Equipment and other |  |  |
Product Information [Line Items] |  |  |
Total net sales | $ 131,130 | $ 153,786 | $ 159,022
Equipment and other | Sales Revenue, Net [Member] |  |  |
Product Information [Line Items] |  |  |
Percentage of consolidated net sales | 6.40% | 15.70% | 20.70%
Equipment and other | Corporate and Eliminations |  |  |
Product Information [Line Items] |  |  |
Total net sales | $ (58) | $ (122) | $ (205)
Equipment and other | Commercial Trailer Products |  |  |
Product Information [Line Items] |  |  |
Total net sales | 16,089 | 16,849 | 10,589
Equipment and other | Diversified Products |  |  |
Product Information [Line Items] |  |  |
Total net sales | 112,184 | 133,499 | 144,371
Equipment and other | Retail |  |  |
Product Information [Line Items] |  |  |
Total net sales | $ 2,915 | $ 3,560 | $ 4,267

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