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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Reporting unit, percentage of fair value in excess of carrying amount			3.00%
Impairment of goodwill		$ 4,900,000		$ 4,944,000
Asset impairment	$ 13,000,000.0	$ 7,100,000	$ 0	24,968,000	$ 0
Capitalized computer software, net	7,900,000		7,200,000	7,900,000
Capitalized computer software, amortization			1,700,000	1,500,000	1,300,000
Research and development expense			$ 19,500,000	8,800,000	$ 3,900,000
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives			P33Y
Used trailers
Property, Plant and Equipment [Line Items]
Accounts payable, trade	$ 0		$ 3,500,000	$ 0
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			P3Y
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			P10Y
DuraPlate Trailer Panels
Property, Plant and Equipment [Line Items]
Standard product warranty, coverage period			10 years
Measurement Input, Discount Rate
Property, Plant and Equipment [Line Items]
Reporting unit, impairment assumption, discount rate			0.160
Measurement Input, Long-term Revenue Growth Rate
Property, Plant and Equipment [Line Items]
Reporting unit, impairment assumption, discount rate			0.0300

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