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Computation of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available to common shareholders	$ 89,370	$ 98,345
Less: Dividends paid on and earnings allocated to participating securities	(1,119)	(900)
Earnings applicable to common stock	$ 88,251	$ 97,445
Weighted average common shares outstanding	465,493,702	488,140,102
Basic earnings per common share	$ 0.19	$ 0.20
Potential dilutive common shares	0	0
Total shares for diluted earnings per common share computation	465,493,702	488,140,102
Diluted earnings per common share and common share equivalents	$ 0.19	$ 0.20

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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