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Major Product Categories and Percentage of Consolidated Net Sales (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales | $ 462,057 | $ 464,272 | $ 471,439 | $ 447,676 | $ 543,711 | $ 531,350 | $ 514,831 | $ 437,597 | $ 527,477 | $ 491,697 | $ 486,021 | $ 358,120 | $ 1,845,444 | $ 2,027,489 | $ 1,863,315
Sales Revenue, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  | $ (13,070) | $ (11,679) | $ (12,300)
Commercial Trailer Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 1,506,110 | 1,582,241 | 1,380,623
Diversified Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 352,404 | 456,927 | 494,992
New Trailers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,551,136 | $ 1,692,229 | $ 1,493,825
New Trailers | Sales Revenue, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 84.10% | 83.50% | 80.20%
New Trailers | Corporate and Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | $ (89) | $ 0 | $ 0
New Trailers | Commercial Trailer Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 1,421,586 | 1,474,201 | 1,267,610
New Trailers | Diversified Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 129,639 | 218,028 | 226,215
Used Trailers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,174 | $ 35,580 | $ 45,115
Used Trailers | Sales Revenue, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 0.80% | 1.80% | 2.40%
Used Trailers | Corporate and Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Used Trailers | Commercial Trailer Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 11,998 | 31,022 | 41,027
Used Trailers | Diversified Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 3,176 | 4,558 | 4,088
Components, parts and service |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 154,755 | $ 168,550 | $ 170,589
Components, parts and service | Sales Revenue, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 8.40% | 8.30% | 9.20%
Components, parts and service | Corporate and Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | $ (12,955) | $ (11,628) | $ (12,300)
Components, parts and service | Commercial Trailer Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 56,191 | 60,482 | 55,429
Components, parts and service | Diversified Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 111,519 | 119,696 | 127,460
Equipment and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 124,379 | $ 131,130 | $ 153,786
Equipment and other | Sales Revenue, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 6.70% | 6.40% | 8.20%
Equipment and other | Corporate and Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | $ (26) | $ (51) | $ 0
Equipment and other | Commercial Trailer Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | 16,335 | 16,536 | 16,557
Equipment and other | Diversified Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 108,070 | $ 114,645 | $ 137,229

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