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Per Share Information - Basic and Diluted Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Amounts attributable to common stock:
Net income from continuing operations	$ 43,176	$ 87,923	$ 122,872	$ 208,818
Net income from discontinued operations	173,212	6,725	193,109	21,320
Net income attributable to common stock	$ 216,388	$ 94,648	$ 315,981	$ 230,138
Weighted average shares:
Weighted average shares outstanding for basic earnings per share	188,951	219,492	206,181	219,395
Effect of dilutive stock options	10	25	12	25
Weighted average shares outstanding for diluted earnings per share	188,961	219,517	206,193	219,420

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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