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GOODWILL - Narrative (Details) $ in Thousands		1 Months Ended	3 Months Ended		12 Months Ended
GOODWILL - Narrative (Details) $ in Thousands	Aug. 31, 2021 segment	Sep. 30, 2021 USD ($) segment	Jun. 30, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2019 USD ($)
Goodwill [Line Items]
Number of operating segments \| segment		2
Number of segments \| segment	3	2
Goodwill		$ 188,443	$ 188,438		$ 199,560	$ 199,552	$ 311,026
Impact of divestiture on goodwill			11,101		4,685
Goodwill impairment loss					106,737
Final Mile Product Reporting Unit
Goodwill [Line Items]
Goodwill impairment loss				$ 95,800
Tank Trailers Reporting Unit
Goodwill [Line Items]
Goodwill impairment loss				$ 11,000
Transportation Solutions
Goodwill [Line Items]
Goodwill		120,508	120,505		120,518	120,513	193,488
Impact of divestiture on goodwill			0		4,685
Goodwill impairment loss					68,257
Parts & Service
Goodwill [Line Items]
Goodwill		$ 67,935	67,933		79,042	$ 79,039	$ 117,538
Impact of divestiture on goodwill			11,101		0
Goodwill impairment loss					$ 38,480
Parts & Service \| Extract Technology
Goodwill [Line Items]
Impact of divestiture on goodwill			$ 11,100