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Calculation of Both Basic and Diluted Net Income or Loss Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Net (loss) income $ (26,426) $ 96,345 $ (168,617) $ (87,464)
Weighted average shares outstanding 149,200 133,238 141,947 128,377
Dilutive effect of employee stock options and warrants 0 [1] 22,737 [1] 0 [1] 0 [1]
Diluted weighted average shares outstanding 149,200 155,975 141,947 128,377
Basic (loss) income per share $ (0.18) $ 0.72 $ (1.19) $ (0.68)
Diluted (loss) income per share $ (0.18) $ 0.62 $ (1.19) $ (0.68)
[1] Potentially dilutive securities representing approximately 38.4 million and 3.2 million shares of common stock for the three month periods ended September 30, 2012 and September 30, 2011, respectively, and approximately 38.4 million and 31.9 million shares of common stock for the nine months ended September 30, 2012 and September 30, 2011, respectively were excluded from the computation of diluted earnings per share for these periods because their effect would have been anti-dilutive.