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Acquisition - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Nov. 01, 2016
Mar. 03, 2016
Akers AB [Member]    
Business Acquisition [Line Items]    
Current assets (excluding inventories)   $ 41,703
Inventories   30,332
Property, plant and equipment   71,871
Intangible assets   11,784
Other noncurrent assets   8,068
Current liabilities   (71,690)
Noncurrent liabilities   (43,153)
Net assets acquired   48,915
Noncontrolling interest   (2,019)
Goodwill   27,259
Base purchase price   $ 74,155
ASW Steel Inc [Member]    
Business Acquisition [Line Items]    
Current assets (excluding inventories) $ 6,525  
Inventories 6,956  
Property, plant and equipment 10,310  
Current liabilities (10,675)  
Outstanding indebtedness (9,616)  
Base purchase price $ 3,500