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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]      
Restricted cash $ 0 $ 0  
Goodwill 188,441,000 188,409,000 $ 188,434,000
Capitalized computer software, net 9,900,000 8,000,000.0  
Capitalized computer software, amortization 3,400,000 1,900,000 1,800,000
Research and development expense 8,600,000 7,500,000 5,300,000
Transportation Solutions      
Property, Plant and Equipment [Line Items]      
Goodwill 120,506,000 120,486,000 $ 120,502,000
Parts & Services      
Property, Plant and Equipment [Line Items]      
Goodwill $ 67,900,000    
Buildings and building improvements      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 33 years    
Used trailers      
Property, Plant and Equipment [Line Items]      
Accounts payable, trade $ 0 $ 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, useful life 3 years    
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, useful life 10 years    
DuraPlate Trailer Panels      
Property, Plant and Equipment [Line Items]      
Standard product warranty, coverage period 10 years