Schedule of Restructuring Accruals Expenses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Restructuring Cost and Reserve [Line Items]
Balance at January 1, 2012			$ 5,875
Restructuring expenses	7,085	2,931	14,604	2,931
Payments, utilization and other			(14,851)
Balance at September 30, 2012	$ 5,628		$ 5,628