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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2020 | Dec. 31, 2020 | Mar. 31, 2020 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 199,560,000 |  |  | $ 199,560,000 | $ 311,026,000 | $ 311,084,000
Goodwill, gross |  | 307,960,000 |  |  | 307,960,000 | 312,689,000 | 317,691,000
Goodwill, impairment loss | $ 0 |  |  | $ 4,900,000 | 106,737,000 |  |
Amortization of intangibles |  |  |  |  | 21,981,000 | 20,471,000 | 19,468,000
2021 |  | 23,000,000.0 |  |  | 23,000,000.0 |  |
2022 |  | 17,900,000 |  |  | 17,900,000 |  |
2023 |  | 15,300,000 |  |  | 15,300,000 |  |
2024 |  | 15,100,000 |  |  | 15,100,000 |  |
2025 |  | 14,000,000.0 |  |  | 14,000,000.0 |  |
Beall Tank Trailers | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Impairment of intangible assets |  | 1,100,000 |  |  |  |  |
Tank Trailers Reporting Unit |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill, impairment loss |  |  | $ 11,000,000.0 |  |  |  |
Commercial Trailer Products |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 2,625,000 |  |  | 2,625,000 | 2,625,000 | 2,625,000
Goodwill, gross |  | 4,288,000 |  |  | 4,288,000 | 4,288,000 | 4,288,000
Goodwill, impairment loss |  |  |  |  | 0 |  |
Diversified Products |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 124,986,000 |  |  | 124,986,000 | 140,686,000 | 140,744,000
Goodwill, gross |  | 135,957,000 |  |  | 135,957,000 | 140,686,000 | 145,688,000
Goodwill, impairment loss |  |  |  | $ 4,900,000 | 10,971,000 |  |
Diversified Products | Tank Trailers Reporting Unit |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 98,400,000 |
Diversified Products | Process Systems Reporting Unit |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 42,300,000 |
Final Mile Products |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | 71,949,000 |  |  | 71,949,000 | 167,715,000 | 167,715,000
Goodwill, gross |  | $ 167,715,000 |  |  | 167,715,000 | $ 167,715,000 | $ 167,715,000
Goodwill, impairment loss |  |  | $ 95,800,000 |  | $ 95,766,000 |  |

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