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Computation of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available to common shareholders		$ 103,957	$ 129,909
Less: Dividends paid on and earnings allocated to participating securities		(819)	(979)
Earnings applicable to common stock		$ 103,138	$ 128,930
Weighted average common shares outstanding		486,511,756	484,605,397
Basic earnings per common share		$ 0.21	$ 0.27
Potential dilutive common shares	[1]	0	0
Total shares for diluted earnings per common share computation		486,511,756	484,605,397
Diluted earnings per common share and common share equivalents		$ 0.21	$ 0.27
[1] At March 31, 2017 and 2016, there were no stock options outstanding.

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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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