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SEGMENTS - Major Product Categories and Percentage of Consolidated Net Sales (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 596,100 | $ 632,828 | $ 686,620 | $ 620,952 | $ 657,449 | $ 655,150 | $ 642,769 | $ 546,761 | $ 479,277 | $ 482,566 | $ 449,422 | $ 392,003 | $ 2,536,500 | $ 2,502,129 | $ 1,803,268
New trailers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 1,918,799 | 2,012,864 | 1,354,373
Used trailers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 4,978 | 2,905 | 2,514
Components, parts and services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 148,256 | 139,762 | 131,929
Equipment and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 464,467 | 346,598 | 314,452
Transportation Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 2,320,274 | 2,312,637 | 1,628,694
Parts & Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 216,226 | 189,492 | 174,574
Operating Segments | Transportation Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 2,338,604 | 2,320,914 | 1,633,319
Operating Segments | Transportation Solutions | New trailers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 1,924,700 | 2,012,428 | 1,354,375
Operating Segments | Transportation Solutions | Used trailers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 165
Operating Segments | Transportation Solutions | Components, parts and services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Segments | Transportation Solutions | Equipment and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 413,904 | 308,486 | 278,779
Operating Segments | Parts & Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 220,873 | 193,476 | 177,166
Operating Segments | Parts & Services | New trailers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 1,722 | 179
Operating Segments | Parts & Services | Used trailers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 4,978 | 2,905 | 2,349
Operating Segments | Parts & Services | Components, parts and services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 148,256 | 139,762 | 131,929
Operating Segments | Parts & Services | Equipment and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 67,639 | 49,087 | 42,709
Corporate and Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | (22,977) | (12,261) | (7,217)
Corporate and Eliminations | New trailers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | (5,901) | (1,286) | (181)
Corporate and Eliminations | Used trailers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Corporate and Eliminations | Components, parts and services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Corporate and Eliminations | Equipment and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | (17,076) | (10,975) | (7,036)
Corporate and Eliminations | Transportation Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 18,330 | 8,277 | 4,625
Corporate and Eliminations | Parts & Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,647 | $ 3,984 | $ 2,592
Product Concentration Risk | Sales revenue, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Product Concentration Risk | New trailers | Sales revenue, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 75.70% | 80.40% | 75.00%
Product Concentration Risk | Used trailers | Sales revenue, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 0.20% | 0.10% | 0.10%
Product Concentration Risk | Components, parts and services | Sales revenue, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 5.80% | 5.60% | 7.30%
Product Concentration Risk | Equipment and other | Sales revenue, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated net sales |  |  |  |  |  |  |  |  |  |  |  |  | 18.30% | 13.90% | 17.40%

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