Restructuring Accruals (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 9,191
Provisions and adjustments	3,105
Amounts applied	(7,509)
Ending Balance	4,787
Employee Severance
Restructuring Reserve [Roll Forward]
Beginning Balance	8,138
Provisions and adjustments	2,914
Amounts applied	(6,974)
Ending Balance	4,078
Employee Severance | Restructuring Fiscal 2009 and Prior Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	2,878
Provisions and adjustments	(442)
Amounts applied	(1,003)
Ending Balance	1,433
Employee Severance | Restructuring - Fiscal 2010 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	5,260
Provisions and adjustments	(289)
Amounts applied	(2,961)
Ending Balance	2,010
Employee Severance | Restructuring - Fiscal 2011 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	0
Provisions and adjustments	3,645
Amounts applied	(3,010)
Ending Balance	635
Contract Termination
Restructuring Reserve [Roll Forward]
Beginning Balance	996
Provisions and adjustments	(113)
Amounts applied	(214)
Ending Balance	669
Contract Termination | Restructuring Fiscal 2009 and Prior Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	996
Provisions and adjustments	1
Amounts applied	(328)
Ending Balance	669
Contract Termination | Restructuring - Fiscal 2010 Plans
Restructuring Reserve [Roll Forward]
Provisions and adjustments	(114)
Amounts applied	114
Ending Balance	0
Other Restructuring
Restructuring Reserve [Roll Forward]
Beginning Balance	57
Provisions and adjustments	304
Amounts applied	(321)
Ending Balance	40
Other Restructuring | Restructuring Fiscal 2009 and Prior Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	57
Provisions and adjustments	174
Amounts applied	(191)
Ending Balance	40
Other Restructuring | Restructuring - Fiscal 2010 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	0
Provisions and adjustments	70
Amounts applied	(70)
Ending Balance	0
Other Restructuring | Restructuring - Fiscal 2011 Plans
Restructuring Reserve [Roll Forward]
Beginning Balance	0
Provisions and adjustments	60
Amounts applied	(60)
Ending Balance	$ 0