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Summary of Nonvested Long-Term Incentive Program Performance Share Awards Outstanding and Changes During Period (Detail) (LTIP Performance Shares, USD $)	9 Months Ended
	Sep. 30, 2012
LTIP Performance Shares
Number of Shares at Expected Attainment
Beginning Balance	931,571
Granted	11,987
Forfeited	(76,196)
Ending Balance	867,362
Weighted-Average Grant Date Fair Value
Beginning Balance	$ 23.33
Granted	$ 39.25
Forfeited	$ 23.50
Ending Balance	$ 23.53

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Name Accounting Standards Codification

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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