Summary of Activity in Restructuring Accrual Accounts (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Restructuring Cost and Reserve [Line Items]
Balance as of December 31, 2011	$ 4,482
Charged to expense	14,345
Payments	(7,169)
Other, net	(432)
Balance as of June 30, 2012	11,226
Termination Benefits
Restructuring Cost and Reserve [Line Items]
Balance as of December 31, 2011	3,188
Charged to expense	12,919
Payments	(5,114)
Other, net	(534)
Balance as of June 30, 2012	10,459
Other
Restructuring Cost and Reserve [Line Items]
Balance as of December 31, 2011	1,294
Charged to expense	1,426
Payments	(2,055)
Other, net	102
Balance as of June 30, 2012	$ 767