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Share-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2012	Jul. 01, 2011	Jun. 29, 2012	Jul. 01, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of stock units vested			$ 1.6
Share-based compensation expense recorded includes compensation expense	1.0	0.8	2.3	1.8
Share-based compensation expense requisite service period			3 years
Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recorded includes compensation expense			$ 0.5	$ 0.6
Deferred stock units granted			43,991	42,536

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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