Roll Forward of Activity for Company's Restructuring Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Oct. 06, 2012	Dec. 31, 2011
2010 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Balance	$ 3,800	$ 5,647
Charges	266	9,409
Cash payments	(1,125)	(10,435)
Non-cash		(821)
Balance	2,941	3,800
2010 Restructuring Plan [Member] | Severance and other employee-related costs [Member]
Restructuring Cost and Reserve [Line Items]
Balance	85	2,092
Charges	174	1,950
Cash payments	(259)	(3,136)
Non-cash		(821)
Balance		85
2010 Restructuring Plan [Member] | Contract termination and other costs [Member]
Restructuring Cost and Reserve [Line Items]
Balance	3,715	3,555
Charges	92	7,459
Cash payments	(866)	(7,299)
Balance	2,941	3,715
2011 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Balance	4,429
Charges	1,988	6,736
Cash payments	(5,238)	(2,161)
Non-cash	(11)	(146)
Balance	1,168	4,429
2011 Restructuring Plan [Member] | Severance and other employee-related costs [Member]
Restructuring Cost and Reserve [Line Items]
Balance	194
Charges	(29)	442
Cash payments	(165)	(248)
Balance		194
2011 Restructuring Plan [Member] | Contract termination and other costs [Member]
Restructuring Cost and Reserve [Line Items]
Balance	4,235
Charges	2,017	6,294
Cash payments	(5,073)	(1,913)
Non-cash	(11)	(146)
Balance	$ 1,168	$ 4,235