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Reportable Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Net Sales |  |  |  |  |
Total net sales | $ 553,073 | $ 425,098 | $ 1,657,082 | $ 1,223,717 |
Income (Loss) from operations | 16,513 | 26,591 | 88,209 | 95,523 |
Assets | 1,350,207 | 1,379,127 | 1,350,207 | 1,379,127 | $ 1,351,513
External Customers |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 553,073 | 425,098 | 1,657,082 | 1,223,717 |
Intersegment Sales |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 0 | 0 | 0 | 0 |
Commercial Trailer Products |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 368,342 | 339,492 | 1,098,271 | 962,421 |
Income (Loss) from operations | 32,453 | 36,319 | 102,718 | 111,865 |
Assets | 358,150 | 362,209 | 358,150 | 362,209 |
Commercial Trailer Products | External Customers |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 368,301 | 339,494 | 1,098,182 | 962,371 |
Commercial Trailer Products | Intersegment Sales |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 41 | (2) | 89 | 50 |
Diversified Products |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 102,361 | 88,850 | 291,649 | 269,587 |
Income (Loss) from operations | (6,346) | 5,178 | 3,078 | 14,844 |
Assets | 352,494 | 356,147 | 352,494 | 356,147 |
Diversified Products | External Customers |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 97,723 | 85,604 | 275,183 | 261,346 |
Diversified Products | Intersegment Sales |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 4,638 | 3,246 | 16,466 | 8,241 |
Final Mile Products |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 87,049 | 0 | 283,717 | 0 |
Income (Loss) from operations | (1,495) | 0 | 9,372 | 0 |
Assets | 475,934 | 0 | 475,934 | 0 |
Final Mile Products | External Customers |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 87,049 | 0 | 283,717 | 0 |
Final Mile Products | Intersegment Sales |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 0 | 0 | 0 | 0 |
Corporate and Eliminations |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | (4,679) | (3,244) | (16,555) | (8,291) |
Income (Loss) from operations | (8,099) | (14,906) | (26,959) | (31,186) |
Assets | 163,629 | 660,771 | 163,629 | 660,771 |
Corporate and Eliminations | External Customers |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 0 | 0 | 0 | 0 |
Corporate and Eliminations | Intersegment Sales |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | $ (4,679) | $ (3,244) | $ (16,555) | $ (8,291) |

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