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Schedule of Estimated Effective Income Tax Rate (Detail)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Taxes
Continuing operations	22.40%	21.00%
Discontinued operations	21.30%	14.60%
Consolidated overall	22.40%	20.90%

- 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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