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Assets and Liability Measured at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Liabilities:
Long term debt redemption feature	$ 14.6
Fair Value, Measurements, Recurring
Asset:
Cash equivalents-money markets	64.1	39.0
Liabilities:
Warrant derivative liability	54.9	123.1
Long term debt redemption feature	14.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Asset:
Cash equivalents-money markets	64.1	39.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Liabilities:
Warrant derivative liability	54.9	123.1
Long term debt redemption feature	$ 14.6

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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