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Quarterly Summarized Financial Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Financial Information [Line Items]                      
Revenue                                 
Net income (loss) $ (10,569) $ (26,426) $ (53,904) $ (88,285) $ 18,338 [1] $ 96,345 [1] $ (202,103) [1] $ 18,294 [1] $ (179,184) $ (69,126) $ (249,589)
Net income (loss) per share:                      
Basic $ (0.07) $ (0.18) $ (0.38) $ (0.65) $ 0.14 $ 0.72 $ (1.58) $ 0.15      
Diluted $ (0.07) $ (0.18) $ (0.38) $ (0.65) $ 0.12 $ 0.62 $ (1.58) $ 0.12      
[1] The net income generated in the first, third and fourth quarters of 2011 were due to the change in the fair value of the warrant derivative liability at each respective quarterly reporting period in 2011. As a result of a decrease in the Company's stock price at each respective quarter end versus the previous quarter end, the value of the derivative liability decreased, resulting in non-cash income for change in the fair value of the warrant derivative. The loss in the second quarter of 2011 was also due primarily to the change in the fair value of the warrant derivative liability, which was due to the Company's stock price increasing in value at June 30, 2011, versus March 31, 2011.