Restructuring and Related Charges (Detail) - Restructuring accrual activity (USD $)	9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011
Accrual	$ 606,000	$ 1,969,000
Charges and adjustments to expense	395,000	(253,000)
Cash payments	(208,000)	(1,272,000)
Accrual	793,000	444,000
Severance and other termination costs [Member]
Accrual	57,000	1,239,000
Charges and adjustments to expense	17,000	21,000
Cash payments	(74,000)	(956,000)
Accrual	0	304,000
Lease Obligations [Member]
Accrual	499,000
Charges and adjustments to expense	418,000
Cash payments	(124,000)
Accrual	793,000
Other Cost [Member]
Accrual	50,000	730,000
Charges and adjustments to expense	(40,000)	(274,000)
Cash payments	(10,000)	(316,000)
Accrual	$ 0	$ 140,000