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Common and Preferred Stock - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 1 Months Ended
Oct. 31, 2012
Feb. 28, 2012
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Feb. 28, 2012
Warrant Liability
Feb. 28, 2012
Related Party
Mar. 31, 2013
Mann Group
Oct. 31, 2012
Mann Group
Oct. 31, 2012
Mann Group
Private Placement
Mar. 31, 2013
Senior convertible notes due August 15 2015
Dec. 31, 2012
Senior convertible notes due August 15 2015
Aug. 18, 2010
Senior convertible notes due August 15 2015
Class of Stock [Line Items]                          
Common stock, shares authorized     550,000,000 550,000,000                  
Common stock, par value     $ 0.01 $ 0.01                  
Undesignated preferred stock, shares authorized     10,000,000                    
Common stock, shares issued     289,375,250 286,035,082                  
Capital stock authorized   31,250,000 289,375,250 286,035,082 31,250,000     31,250,000          
Common stock loaned under share lending agreement, shares     9,000,000 9,000,000                  
Principal amount                     $ 100,000,000 $ 100,000,000 $ 100,000,000
Interest rate for senior subordinate note     5.75%                    
Nominal lending fee     $ 0.01                    
Number of Unit Sold in an Underwritten public offering   35,937,500                      
Underwritten public offering   86,300,000                      
Units sold composition description             Each unit consisting of one share of common stock and a warrant to purchase 0.6 of a share of common stock            
Warrant to purchase of a share of common stock   0.6                      
Net proceeds from offering     80,600,000                    
Rate at which warrants are exercisable 2.60         2.40              
Warrant expiration date   2016-02                      
Restricted Stock Agreed to be Purchased by Lender   77,200,000             107,400,000        
Underwritten public offering 46,000,000                 40,000,000      
Net proceeds from public offering 92,000,000                        
Number of shares in each units issued 1                        
Warrant entitles the holder to purchase a share of common stock 0.75                        
Net proceeds from public offering $ 86,300,000                        
Warrant expiration date Fourth quarter of 2013                        
Common stock purchase                   30,000,000