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Derivative Liability-Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended
	Mar. 31, 2010	Jun. 21, 2011	Dec. 31, 2010
Debt Instrument, Convertible, Beneficial Conversion Feature	$ 55,000
Remeasurement Of Liability			44,000
Unrealized Benefit From Inception Liability Recognized		30,000
Additional Paid-In Capital [Member]
Remeasurement Of Liability		$ 14,000

Amount of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date.

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