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Summary of Carrying Values and Estimated Fair Values of Senior Convertible Notes (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Senior convertible notes due December 15, 2013
Convertible Debt [Line Items]
Carrying value	$ 114,593,000	$ 114,443,000
Estimated fair value	102,200,000	81,900,000
Senior convertible notes due August 15 2015
Convertible Debt [Line Items]
Carrying value	97,791,000	97,583,000
Estimated fair value	$ 83,800,000	$ 63,200,000

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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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.

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