Summary of Activity in Restructuring Accrual Accounts (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended		27 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 7,547
Charged to expense	2,065	[1]	14,415	[1]	18,670	8,584	29,319
Payments	(2,962)
Other, net	(191)
Ending Balance	6,459				7,547		6,459
Termination Benefits
Restructuring Cost and Reserve [Line Items]
Beginning Balance	6,491
Charged to expense	1,553
Payments	(2,416)
Other, net	(175)
Ending Balance	5,453						5,453
Other
Restructuring Cost and Reserve [Line Items]
Beginning Balance	1,056
Charged to expense	512
Payments	(546)
Other, net	(16)
Ending Balance	$ 1,006						$ 1,006

[1] (1) See Note 3 "Restructuring."