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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]              
Restricted cash $ 0     $ 0 $ 0 $ 0  
Goodwill 188,443,000     199,560,000 188,443,000 199,560,000 $ 311,026,000
Asset impairment     $ 800,000   29,163,000 107,114,000 0
Capitalized computer software, net 4,200,000     6,100,000 4,200,000 6,100,000  
Capitalized computer software, amortization         1,700,000 2,000,000 1,700,000
Research and development expense         13,600,000 21,900,000 19,500,000
Trade names and trademarks              
Property, Plant and Equipment [Line Items]              
Asset impairment 28,300,000            
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Beall Tank Trailers              
Property, Plant and Equipment [Line Items]              
Impairment of intangible assets       1,100,000      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Extract Technology              
Property, Plant and Equipment [Line Items]              
Impairment of intangible assets   $ 1,300,000          
Transportation Solutions              
Property, Plant and Equipment [Line Items]              
Goodwill 120,507,000     120,518,000 120,507,000 120,518,000 $ 193,488,000
Transportation Solutions | Trade names and trademarks              
Property, Plant and Equipment [Line Items]              
Asset impairment 25,600,000            
Parts & Services              
Property, Plant and Equipment [Line Items]              
Goodwill 67,900,000       $ 67,900,000    
Parts & Services | Trade names and trademarks              
Property, Plant and Equipment [Line Items]              
Asset impairment 2,700,000            
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 $ 0 $ 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         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