Restructuring - Additional Information (Detail) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2012	Jul. 01, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Effects on Future Earnings and Cash Flows Resulting from Exit Plan [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated	150	160
Percent of workforce related to restructuring				7.00%
Reduction in number of employees				133
Total charges expected to be incurred				$ 6,400,000
Employee termination costs				5,900,000
Other transitional cost				500,000
Restructuring charges	(1,130,000)	5,900,000	644,000	4,468,000	5,756,000
Contract Termination [Member]
Effects on Future Earnings and Cash Flows Resulting from Exit Plan [Line Items]
Restructuring charges				4,800,000
Restructuring Reserve, Accrual Adjustment		(300,000)		300,000
Contract Termination [Member] | 2012 Restructuring Plan
Effects on Future Earnings and Cash Flows Resulting from Exit Plan [Line Items]
Reversal of restructuring charges	$ 1,100,000