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Reportable Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Net Sales          
Total Net Sales $ 464,272 $ 531,350 $ 1,383,387 $ 1,483,778  
Income (Loss) from operations 54,855 56,389 161,911 125,706  
Assets 991,817 1,024,371 991,817 1,024,371 $ 949,670
External Customers          
Net Sales          
Total Net Sales 464,272 531,350 1,383,387 1,483,778  
Intersegment Sales          
Net Sales          
Total Net Sales 0 0 0 0  
Commercial Trailer Products          
Net Sales          
Total Net Sales 380,514 406,410 1,126,767 1,148,263  
Income (Loss) from operations 55,043 45,789 162,435 107,948  
Assets 362,337 367,567 362,337 367,567  
Commercial Trailer Products | External Customers          
Net Sales          
Total Net Sales 380,514 406,382 1,126,752 1,148,039  
Commercial Trailer Products | Intersegment Sales          
Net Sales          
Total Net Sales 0 28 15 224  
Diversified Products          
Net Sales          
Total Net Sales 87,450 127,787 266,609 344,233  
Income (Loss) from operations 6,224 17,601 23,471 38,725  
Assets 386,255 418,741 386,255 418,741  
Diversified Products | External Customers          
Net Sales          
Total Net Sales 83,758 124,968 256,635 335,739  
Diversified Products | Intersegment Sales          
Net Sales          
Total Net Sales 3,692 2,819 9,974 8,494  
Corporate and Eliminations          
Net Sales          
Total Net Sales (3,692) (2,847) (9,989) (8,718)  
Income (Loss) from operations (6,412) (7,001) (23,995) (20,967)  
Assets 243,225 238,063 243,225 238,063  
Corporate and Eliminations | External Customers          
Net Sales          
Total Net Sales 0 0 0 0  
Corporate and Eliminations | Intersegment Sales          
Net Sales          
Total Net Sales $ (3,692) $ (2,847) $ (9,989) $ (8,718)