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Net Loss and Number of Shares Used to Compute Basic and Diluted Earnings per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Loss Per Share [Line Items]        
Net loss-basic   $ (166,227) $ (179,184) $ (69,126)
Gain on warrant derivative liability   (47,936)    
Net loss-diluted   $ (214,163) $ (179,184) $ (69,126)
Net loss per share-basic $ (0.09) $ (1.03) $ (1.24) $ (0.53)
Weighted average shares outstanding-basic   161,022 144,017 130,247
Warrant exercises   6,048    
Weighted average shares outstanding-diluted   167,070 144,017 130,247
Net income loss per share-diluted $ (0.27) $ (1.28) $ (1.24) $ (0.53)