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Senior Secured Notes and Convertible Subordinated Notes - Outstanding Balance of Senior Secured Notes and Convertible Secured Notes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
12% Senior Secured Notes due July 2017 [Member]
Debt Instrument [Line Items]
Semi-Annual Interest Payment Dates	January 15, July 15
Senior secured notes	$ 125,000
3.25% Convertible Subordinated Notes due September 2012 [Member]
Debt Instrument [Line Items]
Semi-Annual Interest Payment Dates	March 28, September 28
Convertible subordinated notes outstanding		$ 214,955

Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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