Restructuring and Other Special Charges and Related Liability Balances (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Restructuring Fiscal 2011 Plan
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 3,178
Expense	(503)
Cash Payments	(1,956)
Non-Cash Utilization	(130)
Ending balance	589
Restructuring Fiscal 2011 Plan | Workforce reduction
Restructuring Cost and Reserve [Line Items]
Beginning balance	1,298
Cash Payments	(1,232)
Ending balance	66
Restructuring Fiscal 2011 Plan | Consolidation of office facilities
Restructuring Cost and Reserve [Line Items]
Beginning balance	1,750
Expense	(503)
Cash Payments	(724)
Ending balance	523
Restructuring Fiscal 2011 Plan | Impairment of Assets
Restructuring Cost and Reserve [Line Items]
Beginning balance	130
Non-Cash Utilization	(130)
Restructuring Fiscal 2012 Plan
Restructuring Cost and Reserve [Line Items]
Expense	26,181
Cash Payments	(13,055)
Non-Cash Utilization	(6,287)
Ending balance	6,839
Restructuring Fiscal 2012 Plan | Workforce reduction
Restructuring Cost and Reserve [Line Items]
Expense	14,701
Cash Payments	(12,303)
Ending balance	2,398
Restructuring Fiscal 2012 Plan | Consolidation of office facilities
Restructuring Cost and Reserve [Line Items]
Expense	6,002
Cash Payments	(756)
Non-Cash Utilization	(882)
Ending balance	4,364
Restructuring Fiscal 2012 Plan | Impairment of Assets
Restructuring Cost and Reserve [Line Items]
Expense	5,249
Cash Payments	156
Non-Cash Utilization	(5,405)
Restructuring Fiscal 2012 Plan | Other costs and professional fees
Restructuring Cost and Reserve [Line Items]
Expense	229
Cash Payments	(152)
Ending balance	$ 77