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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share, Basic and Diluted [Abstract]      
Net income (loss) from continuing operations $ 618,158 $ 107,681 $ 215,556
Net income from discontinued operations 0 0 1,135
Preferred stock dividends (3,723) (3,723) (3,723)
Net income (loss) applicable to common stock $ 614,435 $ 103,958 $ 212,968
Average common shares outstanding 101,142,258 101,966,429 103,275,264
Average potential dilutive common shares 166,385 78,907 102,019
Average common shares outstanding - assuming dilution 101,308,643 102,045,336 103,377,283
Basic EPS $ 6.07 $ 1.02 $ 2.05
Basic EPS from discontinued operations 0 0 0.01
Net Income per Common Share - Basic 6.07 1.02 2.06
Diluted EPS 6.06 1.02 2.05
Diluted EPS from discontinued operations 0 0 0.01
Net Income per Common Share - Diluted $ 6.06 $ 1.02 $ 2.06