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Preferred and Common Stock - Schedule of Share Activity (Detail) - shares
 12 Months Ended
Oct. 05, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Treasury stock, beginning balance   81,051,103 87,150,169 106,895,705
Treasury stock, ending balance     81,051,103 87,150,169
Common Stock Outstanding, beginning balance 1,300,000,000 1,310,160,141 1,216,663,661 1,071,011,162
Common Stock Outstanding, ending balance 400,000,000 438,519,780 1,310,160,141 1,216,663,661
Outstanding Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Conversion of convertible notes       89,383,953
Acquisition of RTI     87,397,414  
Reverse stock split   (876,942,489)    
Private placement       36,523,010
Issued for stock-based compensation plans   5,302,128 6,099,066 19,745,536
Treasury Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Treasury stock retirement   75,831,443    
Reverse stock split   0    
Issued for stock-based compensation plans   (5,219,660) (6,099,066) (19,745,536)