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Acquisitions and Dispositions - Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Oct. 08, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Goodwill $ 2,011,278 $ 2,068,664   $ 1,973,608
Gallatin Steel Company [Member]        
Business Acquisition [Line Items]        
Cash     $ 48,957  
Accounts receivable     82,291  
Inventory     101,692  
Other current assets     5,117  
Property, plant and equipment     483,007  
Goodwill     94,737  
Other intangible assets     67,150  
Other assets     2,529  
Total assets acquired     885,480  
Current liabilities     104,315  
Long-term debt     2,093  
Total liabilities assumed     106,408  
Net assets acquired     $ 779,072