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Basis of Presentation and Significant Accounting Policies (Narrative) (Detail)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Income Tax Contingency [Line Items]
Effective income tax rate, continuing operations	30.20%	25.60%

- 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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