Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 People	Sep. 30, 2012	Sep. 26, 2011
Leases [Abstract]
Expiration of non-cancellable operating leases			through 2022
Accrued lease commitments expense	$ 6.7		$ 6.7
Estimated sublease income	4.8		4.8
Rent expense under operating leases	0.6	0.8	1.8	2.1
Incentives per square feet			40.00
Incentives for improvements to space			2.2
Lease agreement term			10 years
Amount received to start-up new facility					$ 1.0
Minimum number of people to be employed			232
Time period to meet employment commitment			3 years