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Financial Instruments - Fair Value of Derivative Financial Instruments in Consolidated Balance Sheet (Detail) (Foreign Exchange Contract [Member], Not Designated as Hedging Instrument [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accrued Expenses [Member]
Derivatives not designated as hedging instruments:
Liabilities, Fair Value	$ 0.9	$ 0.8
Prepaid Expenses and Other [Member]
Derivatives not designated as hedging instruments:
Assets, fair value		$ 0.2

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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