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Calculation Of Basic And Diluted Net Income Loss Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Share Disclosure [Line Items]
Net (loss) income	$ (88,285)	$ 18,294
Weighted average shares outstanding	136,011	123,426
Dilutive effect of employee stock options and warrants	0	28,074
Diluted weighted average shares outstanding	136,011	151,500
Basic (loss) income per share	$ (0.65)	$ 0.15
Diluted (loss) income per share	$ (0.65)	$ 0.12

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