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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available to common shareholders	$ 98,565	$ 102,261	$ 296,057	$ 313,266
Less: Dividends paid on and earnings allocated to participating securities	(1,219)	(823)	(3,735)	(2,512)
Earnings applicable to common stock	$ 97,346	$ 101,438	$ 292,322	$ 310,754
Weighted average common shares outstanding	488,476,340	487,274,303	488,383,554	487,025,614
Basic earnings per common share	$ 0.20	$ 0.21	$ 0.60	$ 0.64
Potential dilutive common shares	0	0	0	0
Total shares for diluted earnings per share computation	488,476,340	487,274,303	488,383,554	487,025,614
Diluted earnings per common share and common share equivalents	$ 0.20	$ 0.21	$ 0.60	$ 0.64

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