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Computation of Basic and Diluted EPS (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income available to common shareholders $ 107,048 $ 126,460 $ 211,005 $ 256,369
Less: Dividends paid on and earnings allocated to participating securities (873) (983) (1,693) (1,962)
Earnings applicable to common stock $ 106,175 $ 125,477 $ 209,312 $ 254,407
Weighted average common shares outstanding 487,282,404 485,303,073 486,899,209 484,954,235
Basic earnings per common share $ 0.22 $ 0.26 $ 0.43 $ 0.52
Potential dilutive common shares [1] 0 0 0 0
Total shares for diluted earnings per share computation 487,282,404 485,303,073 486,899,209 484,954,235
Diluted earnings per common share and common share equivalents $ 0.22 $ 0.26 $ 0.43 $ 0.52
[1] At June 30, 2017 and 2016, there were no stock options outstanding.