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Amounts Recognized in Financial Statements with Respect to Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 25, 2011	Jun. 30, 2012	Jun. 25, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total cost of the Plans during the period	$ 1,661	$ 1,268	$ 3,186	$ 2,473
Amount of related income tax benefit recognized during the period	379	333	1,332	638
Net cost of the Plans during the period	$ 1,282	$ 935	$ 1,854	$ 1,835

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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