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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Dec. 31, 2011
Income Taxes [Line Items]
Income tax rate	21.90%	30.40%
Total gross liability for unrecognized tax benefits	$ 13.3	$ 24.8	$ 26.5

- 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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