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Reportable Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Net Sales      
Total net sales $ 491,319 $ 362,716  
Income (Loss) from operations 25,656 30,264  
Reconciling items to net income      
Assets 1,409,548 949,283 $ 1,351,513
External Customers      
Net Sales      
Total net sales 491,319 362,716  
Intersegment Sales      
Net Sales      
Total net sales 0 0  
Commercial Trailer Products      
Net Sales      
Total net sales 327,422 274,789  
Income (Loss) from operations 29,481 33,392  
Reconciling items to net income      
Assets 350,187 323,001  
Commercial Trailer Products | External Customers      
Net Sales      
Total net sales 327,397 274,750  
Commercial Trailer Products | Intersegment Sales      
Net Sales      
Total net sales 25 39  
Diversified Products      
Net Sales      
Total net sales 95,203 89,910  
Income (Loss) from operations 5,028 4,604  
Reconciling items to net income      
Assets 356,852 375,338  
Diversified Products | External Customers      
Net Sales      
Total net sales 88,463 87,966  
Diversified Products | Intersegment Sales      
Net Sales      
Total net sales 6,740 1,944  
Final Mile Products      
Net Sales      
Total net sales 75,459 0  
Income (Loss) from operations 609 0  
Reconciling items to net income      
Assets 467,994 0  
Final Mile Products | External Customers      
Net Sales      
Total net sales 75,459 0  
Final Mile Products | Intersegment Sales      
Net Sales      
Total net sales 0 0  
Corporate and Eliminations      
Net Sales      
Total net sales (6,765) (1,983)  
Income (Loss) from operations (9,462) (7,732)  
Reconciling items to net income      
Assets 234,515 250,944  
Corporate and Eliminations | External Customers      
Net Sales      
Total net sales 0 0  
Corporate and Eliminations | Intersegment Sales      
Net Sales      
Total net sales $ (6,765) $ (1,983)