Summary of Status of Restructuring Reserves (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Restructuring Cost And Reserve [Line Items]
Beginning balance	$ 8,826
Additions to the reserve	37,608
Non-cash write-off of leasehold improvements	(2,751)
Cash payments and other usage	(15,266)
Ending balance	28,417
Severance / Other
Restructuring Cost And Reserve [Line Items]
Beginning balance	1,362
Additions to the reserve	10,207
Non-cash write-off of leasehold improvements
Cash payments and other usage	(7,777)
Ending balance	3,792
Facilities
Restructuring Cost And Reserve [Line Items]
Beginning balance	7,464
Additions to the reserve	24,303
Non-cash write-off of leasehold improvements	(2,751)
Cash payments and other usage	(5,247)
Ending balance	23,769
Projects Discontinued
Restructuring Cost And Reserve [Line Items]
Beginning balance
Additions to the reserve	3,098
Non-cash write-off of leasehold improvements
Cash payments and other usage	(2,242)
Ending balance	$ 856