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Schedule of Estimated Effective Income Tax Rate (Detail)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Income Taxes
Continuing operations	15.90%	23.60%
Discontinued operations	34.60%	40.60%
Consolidated overall	15.80%	22.80%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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