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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Impairment of goodwill		$ 4,900,000	$ 4,944,000	$ 0
Asset impairment charges	$ 13,000,000	$ 7,100,000
Capitalized computer software, net	7,900,000		7,900,000	7,300,000
Capitalized computer software, amortization			1,500,000	1,300,000	$ 1,000,000
Accounts payable, trade	$ 0		0	3,200,000
Research and development expense			8,800,000	3,900,000	6,400,000
Used trailers
Property, Plant and Equipment [Line Items]
Property, plant and equipment, additions			$ 3,200,000	$ 9,500,000	$ 4,600,000
Building and Building Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives			P33Y
Minimum
Property, Plant and Equipment [Line Items]
Capitlalized 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]
Capitlalized 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

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Carrying value as of the balance sheet date of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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