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Subsequent Events - Additional Information (Detail) - Subsequent Event [Member]
$ in Millions
Oct. 31, 2016
USD ($)
Facility
T
Subsequent Event [Line Items]  
Number of facilities manufacturing hollow structural section (HSS) tubing 4
Illinois [Member]  
Subsequent Event [Line Items]  
Number of facilities manufacturing hollow structural section (HSS) tubing 2
Alabama [Member]  
Subsequent Event [Line Items]  
Number of facilities manufacturing hollow structural section (HSS) tubing 2
ITC [Member]  
Subsequent Event [Line Items]  
Business acquisition approximate purchase price | $ $ 435
Annual production capacity | T 600,000