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Note Net income per common share (Computation of net income (loss) per common share ("EPS"), basic and diluted) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]      
Preferred stock dividends $ (3,723) $ (3,723) $ (3,723)
Net income (loss) applicable to common stock $ 891,621 $ (317,213) $ 595,604
Average common shares outstanding 102,967,186 102,848,792 102,693,685
Average potential dilutive common shares 157,123 0 367,790
Average common shares outstanding - assuming dilution 103,124,309 102,848,792 103,061,475
Net (Loss) Income per Common Share - Basic $ 8.66 $ (3.08) $ 5.8
Net (Loss) Income per Common Share - Diluted $ 8.65 $ (3.08) $ 5.78
Continuing Operations      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]      
Income (loss) from continuing operations $ 893,997 $ (190,510) $ 558,818
Net (loss) income from continuing operations - Basic $ 8.65 $ (1.88) $ 5.41
Net (loss) income from continuing operations - Diluted $ 8.64 $ (1.88) $ 5.39
Discontinued Operations      
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]      
Income Loss From Discontinued Operations Net Of Tax $ 1,347 $ (122,980) $ 40,509
Net (loss) income from discontinued operations - Basic $ 0.01 $ (1.2) $ 0.39
Net loss (income) from discontinued operations - Diluted $ 0.01 $ (1.2) $ 0.39