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Potential Common Shares Excluded from Computation of Diluted Net Loss per Share (Detail)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 9,528,703 7,724,039
5.375% Convertible notes
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 702,701 3,981,969
3.75% Convertible notes
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 5,487,642  
Restricted stock units
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 556,888 591,677
Outstanding Stock Awards
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 2,718,720 3,087,641
Outstanding warrants
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 62,752 62,752