Commitments and Contingencies - Additional Information (Detail) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 USD ($) Y	Sep. 30, 2012 Bank Guarantees And Standby Letters Of Credit [Member] USD ($)	Sep. 30, 2012 Bank Guarantees [Member] USD ($)	Sep. 30, 2012 Bank Guarantees [Member] EUR (€)	Sep. 30, 2012 Pledged Assets [Member] USD ($)
Commitments And Contingencies [Line Items]
Bank guarantees and letters of credit outstanding		$ 90.7
Reduction amount related to outstanding bank guarantees		77.4
The amount of bank guarantees related to governmental requirements on income tax disputes			42.0	32.7
Bank guarantees related to appeals on income tax and indirect tax cases	25.3
The amount of pledged assets, principally PP&E to cover income tax and indirect tax assessments					20.1
Available lines of credit	71.5
Duration as potentially responsible party, years	20
Estimated maximum future costs of environmental liabilities for identified sites	$ 5
Number of liability insurers for potentially responsible party liability	3