Financial Assets And Liabilities Measured At Fair Value On Recurring Basis (Parenthetical) (Detail) (Other Current Assets/Liabilities, Fair Value, Measurements, Recurring, Not Designated as Hedging Instrument, Less Than 6 Months, Foreign Exchange Contract, USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Other Current Assets/Liabilities | Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument | Less Than 6 Months | Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Nominal volume	$ 1,241.9