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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2020 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Restricted cash |  | $ 0 |  |  |  | $ 0 | $ 0 |
Goodwill, impairment loss | $ 0 |  |  |  | $ 4,900,000 | 106,737,000 |  |
Goodwill |  | 199,560,000 |  | $ 311,084,000 |  | 199,560,000 | 311,026,000 | $ 311,084,000
Impact of divestiture on goodwill |  |  |  |  |  | 4,685,000 | 4,944,000 |
Asset impairment |  |  |  | 13,000,000.0 | 7,100,000 | 107,114,000 | 0 | 24,968,000
Capitalized computer software, net |  | 6,100,000 |  |  |  | 6,100,000 | 7,200,000 |
Capitalized computer software, amortization |  |  |  |  |  | 2,000,000.0 | 1,700,000 | 1,500,000
Research and development expense |  |  |  |  |  | 21,900,000 | 19,500,000 | 8,800,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Beall Tank Trailers |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Impact of divestiture on goodwill |  | 4,700,000 |  |  |  |  |  |
Impairment of intangible assets |  | 1,100,000 |  |  |  |  |  |
Commercial Trailer Products |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Goodwill, impairment loss |  |  |  |  |  | 0 |  |
Goodwill |  | 2,625,000 |  | 2,625,000 |  | 2,625,000 | 2,625,000 | 2,625,000
Impact of divestiture on goodwill |  |  |  |  |  | 0 | 0 |
Diversified Products |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Goodwill, impairment loss |  |  |  |  | $ 4,900,000 | 10,971,000 |  |
Goodwill |  | 124,986,000 |  | 140,744,000 |  | 124,986,000 | 140,686,000 | 140,744,000
Impact of divestiture on goodwill |  |  |  |  |  | 4,685,000 | 4,944,000 |
Final Mile Products |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Goodwill, impairment loss |  |  | $ 95,800,000 |  |  | 95,766,000 |  |
Goodwill |  | 71,949,000 |  | $ 167,715,000 |  | 71,949,000 | 167,715,000 | $ 167,715,000
Impact of divestiture on goodwill |  |  |  |  |  | $ 0 | 0 |
Process Systems Reporting Unit | Diversified Products |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 42,300,000 |
Tank Trailers Reporting Unit |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Goodwill, impairment loss |  |  | $ 11,000,000.0 |  |  |  |  |
Tank Trailers Reporting Unit | Diversified Products |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 98,400,000 |
Buildings and building improvements |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  |  |  | 33 years |  |
Used trailers |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Accounts payable, trade |  | $ 0 |  |  |  | $ 0 | $ 3,500,000 |
Minimum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Capitalized computer software, amortization period |  |  |  |  |  | 3 years |  |
Standard product warranty, coverage period |  |  |  |  |  | 1 year |  |
Minimum | Machinery and equipment |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  |  |  | three |  |
Maximum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Capitalized computer software, amortization period |  |  |  |  |  | 7 years |  |
Standard product warranty, coverage period |  |  |  |  |  | 5 years |  |
Maximum | Machinery and equipment |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  |  |  | ten years |  |
DuraPlate Trailer Panels |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Standard product warranty, coverage period |  |  |  |  |  | 10 years |  |

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