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Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net income $ 129,909 $ 119,259
Less: Dividends paid on and earnings allocated to participating securities (979) (872)
Earnings applicable to common stock $ 128,930 $ 118,387
Weighted average common shares outstanding 484,605,397 441,990,338
Basic earnings per common share $ 0.27 $ 0.27
Potential dilutive common shares [1] 0 0
Total shares for diluted earnings per share computation 484,605,397 441,990,338
Diluted earnings per common share and common share equivalents $ 0.27 $ 0.27
[1] At March 31, 2016, there were no stock options outstanding. Options to purchase 32,400 shares of the Company's common stock that were outstanding as of March 31, 2015 at weighted average exercise prices of $18.15 per share were excluded from the computation of diluted EPS because their inclusion would have had an antidilutive effect.