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Reportable Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Net Sales |  |  |  |  |
Total net sales | $ 612,690 | $ 435,903 | $ 1,104,009 | $ 798,619 |
Income (Loss) from operations | 46,041 | 38,668 | 71,696 | 68,932 |
Assets | 1,369,131 | 932,411 | 1,369,131 | 932,411 | $ 1,351,513
External Customers |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 612,690 | 435,903 | 1,104,009 | 798,619 |
Intersegment Sales |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 0 | 0 | 0 | 0 |
Commercial Trailer Products |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 402,507 | 348,140 | 729,929 | 622,929 |
Income (Loss) from operations | 40,784 | 42,154 | 70,265 | 75,546 |
Assets | 356,309 | 347,042 | 356,309 | 347,042 |
Commercial Trailer Products | External Customers |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 402,484 | 348,127 | 729,881 | 622,877 |
Commercial Trailer Products | Intersegment Sales |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 23 | 13 | 48 | 52 |
Diversified Products |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 94,085 | 90,827 | 189,288 | 180,737 |
Income (Loss) from operations | 4,395 | 5,062 | 9,423 | 9,666 |
Assets | 353,757 | 366,727 | 353,757 | 366,727 |
Diversified Products | External Customers |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 88,997 | 87,776 | 177,460 | 175,742 |
Diversified Products | Intersegment Sales |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 5,088 | 3,051 | 11,828 | 4,995 |
Final Mile Products |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 121,209 | 0 | 196,668 | 0 |
Income (Loss) from operations | 10,258 | 0 | 10,867 | 0 |
Assets | 474,121 | 0 | 474,121 | 0 |
Final Mile Products | External Customers |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 121,209 | 0 | 196,668 | 0 |
Final Mile Products | Intersegment Sales |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 0 | 0 | 0 | 0 |
Corporate and Eliminations |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | (5,111) | (3,064) | (11,876) | (5,047) |
Income (Loss) from operations | (9,396) | (8,548) | (18,859) | (16,280) |
Assets | 184,944 | 218,642 | 184,944 | 218,642 |
Corporate and Eliminations | External Customers |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | 0 | 0 | 0 | 0 |
Corporate and Eliminations | Intersegment Sales |  |  |  |  |
Net Sales |  |  |  |  |
Total net sales | $ (5,111) | $ (3,064) | $ (11,876) | $ (5,047) |

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