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Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income $ 126,460 $ 123,704 $ 256,369 $ 242,963
Less: Dividends paid on and earnings allocated to participating securities (983) (911) (1,962) (1,760)
Earnings applicable to common stock $ 125,477 $ 122,793 $ 254,407 $ 241,203
Weighted average common shares outstanding 485,303,073 442,721,173 484,954,235 442,357,774
Basic earnings per common share $ 0.26 $ 0.28 $ 0.52 $ 0.55
Potential dilutive common shares [1] 0 0 0 0
Total shares for diluted earnings per share computation 485,303,073 442,721,173 484,954,235 442,357,774
Diluted earnings per common share and common share equivalents $ 0.26 $ 0.28 $ 0.52 $ 0.55
[1] At June 30, 2016, there were no stock options outstanding. Options to purchase 10,000 shares of the Company's common stock that were outstanding in the three and six months ended June 30, 2015, at weighted average exercise prices of $18.41 per share were excluded from the computation of diluted EPS because their inclusion would have had an antidilutive effect.