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Per Share Information - Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Amounts attributable to common stock:
Net income attributable to common stock	$ 94,648	$ 92,906	$ 230,138	$ 235,224
Weighted average shares:
Weighted average shares outstanding for basic earnings per share	219,492	214,866	219,395	214,178
Effect of dilutive stock options	25	50	25	51
Weighted average shares outstanding for diluted earnings per share	219,517	214,916	219,420	214,229

X

- Definition

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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

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- Definition

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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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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