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Reportable Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Net Sales          
Total Net Sales $ 435,903 $ 471,438 $ 798,619 $ 919,114  
Income (Loss) from operations 38,668 58,872 68,932 107,056  
Assets 932,411 986,593 932,411 986,593 $ 898,733
External Customers          
Net Sales          
Total Net Sales 435,903 471,438 798,619 919,114  
Intersegment Sales          
Net Sales          
Total Net Sales 0 0 0 0  
Commercial Trailer Products          
Net Sales          
Total Net Sales 348,140 382,212 622,929 746,252  
Income (Loss) from operations 42,154 57,135 75,546 107,392  
Assets 347,042 353,270 347,042 353,270  
Commercial Trailer Products | External Customers          
Net Sales          
Total Net Sales 348,127 382,207 622,877 746,237  
Commercial Trailer Products | Intersegment Sales          
Net Sales          
Total Net Sales 13 5 52 15  
Diversified Products          
Net Sales          
Total Net Sales 90,827 92,870 180,737 179,159  
Income (Loss) from operations 5,062 10,258 9,666 17,247  
Assets 366,727 394,233 366,727 394,233  
Diversified Products | External Customers          
Net Sales          
Total Net Sales 87,776 89,231 175,742 172,877  
Diversified Products | Intersegment Sales          
Net Sales          
Total Net Sales 3,051 3,639 4,995 6,282  
Corporate and Eliminations          
Net Sales          
Total Net Sales (3,064) (3,644) (5,047) (6,297)  
Income (Loss) from operations (8,548) (8,521) (16,280) (17,583)  
Assets 218,642 239,090 218,642 239,090  
Corporate and Eliminations | External Customers          
Net Sales          
Total Net Sales 0 0 0 0  
Corporate and Eliminations | Intersegment Sales          
Net Sales          
Total Net Sales $ (3,064) $ (3,644) $ (5,047) $ (6,297)