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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Operating Loss Carryforwards [Line Items]
Gain related to adjustment of tax expense to previously filed returns and recognition of state deferred tax asset		$ 12.6
Effective income tax rate	27.80%	27.40%

- 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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