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Effective Income Tax Rates (Detail)	3 Months Ended		9 Months Ended
Effective Income Tax Rates (Detail)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Taxes [Line Items]
Effective income tax rate	43.70%	34.10%	41.10%	39.70%

- 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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