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Reportable Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Net Sales          
Total Net Sales $ 425,098 $ 464,272 $ 1,223,717 $ 1,383,387  
Income (Loss) from operations 26,591 54,855 95,523 161,911  
Assets 1,379,127 991,817 1,379,127 991,817 $ 898,733
External Customers          
Net Sales          
Total Net Sales 425,098 464,272 1,223,717 1,383,387  
Intersegment Sales          
Net Sales          
Total Net Sales 0 0 0 0  
Commercial Trailer Products          
Net Sales          
Total Net Sales 339,492 380,514 962,421 1,126,767  
Income (Loss) from operations 36,319 55,043 111,865 162,435  
Assets 362,209 362,337 362,209 362,337  
Commercial Trailer Products | External Customers          
Net Sales          
Total Net Sales 339,494 380,514 962,371 1,126,752  
Commercial Trailer Products | Intersegment Sales          
Net Sales          
Total Net Sales (2) 0 50 15  
Diversified Products          
Net Sales          
Total Net Sales 88,850 87,450 269,587 266,609  
Income (Loss) from operations 5,178 6,224 14,844 23,471  
Assets 356,147 386,255 356,147 386,255  
Diversified Products | External Customers          
Net Sales          
Total Net Sales 85,604 83,758 261,346 256,635  
Diversified Products | Intersegment Sales          
Net Sales          
Total Net Sales 3,246 3,692 8,241 9,974  
Corporate and Eliminations          
Net Sales          
Total Net Sales (3,244) (3,692) (8,291) (9,989)  
Income (Loss) from operations (14,906) (6,412) (31,186) (23,995)  
Assets 660,771 243,225 660,771 243,225  
Corporate and Eliminations | External Customers          
Net Sales          
Total Net Sales 0 0 0 0  
Corporate and Eliminations | Intersegment Sales          
Net Sales          
Total Net Sales $ (3,244) $ (3,692) $ (8,291) $ (9,989)