Performance Unit Plan - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 28, 2013	Sep. 28, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Accrued compensation and related payroll tax expenses	$ 0	$ 20.4
Performance Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Base value of performance unit plan	$ 0.15	$ 0.15
Number of performance unit vested		1,057,772