Summary of Activity in Restructuring Accrual Accounts (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]
Balance as of December 31, 2011	$ 4,482
Charged to expense	15,805
Payments	(10,809)
Other, net	(297)
Balance as of September 30, 2012	9,181
Termination Benefits
Restructuring Cost and Reserve [Line Items]
Balance as of December 31, 2011	3,188
Charged to expense	13,814
Payments	(8,340)
Other, net	(459)
Balance as of September 30, 2012	8,203
Other
Restructuring Cost and Reserve [Line Items]
Balance as of December 31, 2011	1,294
Charged to expense	1,991
Payments	(2,469)
Other, net	162
Balance as of September 30, 2012	$ 978