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Effective Income Tax Rates (Detail)	3 Months Ended		6 Months Ended
Effective Income Tax Rates (Detail)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Income Taxes [Line Items]
Effective Income Tax Rate	43.60%	38.80%	42.70%	42.40%

- 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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