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Income Taxes - Additional Information (Detail)	6 Months Ended
Income Taxes - Additional Information (Detail)	Jun. 30, 2011	Jun. 30, 2010
Income Taxes [Line Items]
Effective income tax rate	16.90%	23.40%

- 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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