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GOODWILL - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2019
Goodwill [Line Items] |  |  |  |
Goodwill |  | $ 199,560 | $ 199,552 | $ 311,026
Goodwill impairment loss |  | 106,737 |  |
Tank Trailers Reporting Unit |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill impairment loss | $ 11,000 |  |  |
Final Mile Product Reporting Unit |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill impairment loss | $ 95,800 |  |  |
Commercial Trailer Products |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill |  | 2,625 | 2,625 | 2,625
Goodwill impairment loss |  | 0 |  |
Diversified Products |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill |  | 124,986 | 124,978 | 140,686
Goodwill impairment loss |  | 10,971 |  |
Final Mile Products |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill |  | 71,949 | $ 71,949 | $ 167,715
Goodwill impairment loss |  | $ 95,766 |  |

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