Restructuring Accrual Activity recorded on Condensed Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 12,805	$ 3,994	$ 3,994
Acquired	17,062
Costs incurred	10,490		11,500
Cash payments and other	(12,372)	(1,274)	(2,689)
Ending balance	$ 27,985	$ 2,720	$ 12,805