Summary of Accrual Activities by Components Related to Company's Restructuring Charges (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2012	Jul. 01, 2011	Jun. 29, 2012	Jul. 01, 2011
Restructuring Cost and Reserve [Line Items]
Accrued expense beginning balance			$ 1,561
Restructuring charges	2,451	(75)	4,668	60
Cash payments			(2,567)
Non-cash write-offs or other adjustments			(1,919)
Accrued expense ending balance	1,743		1,743
Employee Severance
Restructuring Cost and Reserve [Line Items]
Accrued expense beginning balance			470
Restructuring charges			1,562
Cash payments			(836)
Non-cash write-offs or other adjustments			4
Accrued expense ending balance	1,200		1,200
Facility
Restructuring Cost and Reserve [Line Items]
Accrued expense beginning balance			1,062
Restructuring charges			41
Cash payments			(625)
Non-cash write-offs or other adjustments			(31)
Accrued expense ending balance	447		447
Accelerated Depreciation and Impairment
Restructuring Cost and Reserve [Line Items]
Restructuring charges			1,891
Non-cash write-offs or other adjustments			(1,891)
Other Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Accrued expense beginning balance			29
Restructuring charges			1,174
Cash payments			(1,106)
Non-cash write-offs or other adjustments			(1)
Accrued expense ending balance	$ 96		$ 96