Schedule of Quarterly Financial and Other Supplemental Information (Parenthetical) (Detail) (USD $)	3 Months Ended		12 Months Ended						3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2012 Pre Tax	Mar. 31, 2012 Pre Tax	Dec. 31, 2012 After Tax	Mar. 31, 2012 After Tax
Quarterly Financial Information [Line Items]
Restructuring charges			$ 18,670,000	[1]	$ 8,584,000	[1]	$ 2,196,000	[1]	$ 2,900,000	$ 14,400,000	$ 2,100,000	$ 10,300,000
Corporate relocation and acquisition due diligence	2,600,000	600,000
Corporate relocation and acquisition due diligence, net of tax	1,900,000	400,000
Net foreign currency gain on acquisition		$ 3,400,000

[1] See Note 4 "Restructuring."