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Reportable Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Net Sales |  |  |
Total net sales | $ 491,319 | $ 362,716 |
Income (Loss) from operations | 25,656 | 30,264 |
Reconciling items to net income |  |  |
Assets | 1,409,548 | 949,283 | $ 1,351,513
External Customers |  |  |
Net Sales |  |  |
Total net sales | 491,319 | 362,716 |
Intersegment Sales |  |  |
Net Sales |  |  |
Total net sales | 0 | 0 |
Commercial Trailer Products |  |  |
Net Sales |  |  |
Total net sales | 327,422 | 274,789 |
Income (Loss) from operations | 29,481 | 33,392 |
Reconciling items to net income |  |  |
Assets | 350,187 | 323,001 |
Commercial Trailer Products | External Customers |  |  |
Net Sales |  |  |
Total net sales | 327,397 | 274,750 |
Commercial Trailer Products | Intersegment Sales |  |  |
Net Sales |  |  |
Total net sales | 25 | 39 |
Diversified Products |  |  |
Net Sales |  |  |
Total net sales | 95,203 | 89,910 |
Income (Loss) from operations | 5,028 | 4,604 |
Reconciling items to net income |  |  |
Assets | 356,852 | 375,338 |
Diversified Products | External Customers |  |  |
Net Sales |  |  |
Total net sales | 88,463 | 87,966 |
Diversified Products | Intersegment Sales |  |  |
Net Sales |  |  |
Total net sales | 6,740 | 1,944 |
Final Mile Products |  |  |
Net Sales |  |  |
Total net sales | 75,459 | 0 |
Income (Loss) from operations | 609 | 0 |
Reconciling items to net income |  |  |
Assets | 467,994 | 0 |
Final Mile Products | External Customers |  |  |
Net Sales |  |  |
Total net sales | 75,459 | 0 |
Final Mile Products | Intersegment Sales |  |  |
Net Sales |  |  |
Total net sales | 0 | 0 |
Corporate and Eliminations |  |  |
Net Sales |  |  |
Total net sales | (6,765) | (1,983) |
Income (Loss) from operations | (9,462) | (7,732) |
Reconciling items to net income |  |  |
Assets | 234,515 | 250,944 |
Corporate and Eliminations | External Customers |  |  |
Net Sales |  |  |
Total net sales | 0 | 0 |
Corporate and Eliminations | Intersegment Sales |  |  |
Net Sales |  |  |
Total net sales | $ (6,765) | $ (1,983) |

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