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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
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Preferred stock dividends $ (930) $ (931) $ (2,792) $ (2,792)
Net income (loss) applicable to common stock $ 45,880 $ 84,709 $ 218,004 $ 755,126
Average common shares outstanding 103,296,443 102,969,214 103,243,851 102,923,018
Average potential dilutive common shares 168,942 181,268 140,098 214,744
Average common shares outstanding - assuming dilution 103,465,385 103,150,482 103,383,949 103,137,762
Net Income per Common Share - Basic $ 0.44 $ 0.82 $ 2.11 $ 7.34
Net Income per Common Share - Diluted $ 0.44 $ 0.82 $ 2.11 $ 7.32
Continuing Operations        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income (loss) from continuing operations $ 46,810 $ 85,649 $ 220,796 $ 756,571
Net income from continuing operations - Basic $ 0.44 $ 0.82 $ 2.11 $ 7.33
Net income from continuing operations - Diluted $ 0.44 $ 0.82 $ 2.11 $ 7.31
Discontinued Operations        
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Income Loss From Discontinued Operations Net Of Tax $ 0 $ (9) $ 0 $ 1,347
Net income from discontinued operations - Basic $ 0 $ 0 $ 0 $ 0.01
Net income from discontinued operations - Diluted $ 0 $ 0 $ 0 $ 0.01