Restructuring - Schedule Of Reconciliation Of Accrued Restructuring Charges (Detail) (USD $)	3 Months Ended	12 Months Ended
	Jul. 01, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 5,900,000	$ 4,429,000	$ 5,855,000	$ 2,780,000
Reversal of prior-year restructuring charges		0
Accrued Employee Termination Costs Per Contract [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance		1,000,000	700,000	2,600,000
Restructuring costs		4,800,000	5,300,000	500,000
Reversal of prior-year restructuring charges		(300,000)
Ending Balance		200,000	1,000,000	700,000
Accrued One-time Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance			0	300,000
Restructuring costs		0	100,000	600,000
Ending Balance				0
Accrued Total Employee Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance		1,000,000	700,000	2,900,000
Restructuring costs		4,800,000	5,400,000	1,100,000
Reversal of prior-year restructuring charges		(300,000)
Ending Balance		200,000	1,000,000	700,000
Accrued Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance		1,000,000	1,400,000	0
Restructuring costs		0	500,000	1,700,000
Reversal of prior-year restructuring charges		0
Ending Balance		800,000	1,000,000	1,400,000
Total Accrued Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance		2,000,000	2,100,000	2,900,000
Restructuring costs		4,800,000	5,900,000	2,800,000
Reversal of prior-year restructuring charges		(300,000)
Ending Balance		1,000,000	2,000,000	2,100,000
2010 Restructuring Plan [Member] | Accrued Employee Termination Costs Per Contract [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges utilized				(2,400,000)
2010 Restructuring Plan [Member] | Accrued One-time Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges utilized				(900,000)
2010 Restructuring Plan [Member] | Accrued Total Employee Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges utilized				(3,300,000)
2010 Restructuring Plan [Member] | Accrued Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges utilized				(300,000)
2010 Restructuring Plan [Member] | Total Accrued Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges utilized				(3,600,000)
2011 Restructuring Plan [Member] | Accrued Employee Termination Costs Per Contract [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges utilized			(5,000,000)
2011 Restructuring Plan [Member] | Accrued One-time Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges utilized			(100,000)
Ending Balance		0	0
2011 Restructuring Plan [Member] | Accrued Total Employee Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges utilized			(5,100,000)
2011 Restructuring Plan [Member] | Accrued Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges utilized			(900,000)
2011 Restructuring Plan [Member] | Total Accrued Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges utilized			(6,000,000)
2012 Restructuring Plan | Accrued Employee Termination Costs Per Contract [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs		4,800,000
Restructuring charges utilized		(5,300,000)
2012 Restructuring Plan | Accrued One-time Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges utilized		0
2012 Restructuring Plan | Accrued Total Employee Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges utilized		(5,300,000)
2012 Restructuring Plan | Accrued Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges utilized		(200,000)
2012 Restructuring Plan | Total Accrued Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges utilized		$ (5,500,000)