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Computation of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available to common shareholders	$ 90,839	$ 98,565	$ 269,248	$ 296,057
Less: Dividends paid on and earnings allocated to participating securities	(1,073)	(1,219)	(3,245)	(3,735)
Earnings applicable to common stock	$ 89,766	$ 97,346	$ 266,003	$ 292,322
Weighted average common shares outstanding	465,357,326	488,476,340	465,400,372	488,383,554
Basic earnings per common share	$ 0.19	$ 0.20	$ 0.57	$ 0.60
Potential dilutive common shares	418,674	0	237,708	0
Total shares for diluted earnings per common share computation	465,776,000	488,476,340	465,638,080	488,383,554
Diluted earnings per common share and common share equivalents	$ 0.19	$ 0.20	$ 0.57	$ 0.60

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