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Anti-Dilutive Common Stock Excluded From Computation (Detail)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential shares of common stock excluded from computation of earnings (loss) per share as they are anti-dilutive 32,921 35,173 12,735
Options to purchase common stock
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential shares of common stock excluded from computation of earnings (loss) per share as they are anti-dilutive 13,895 16,319 12,497
Common stock issuable under convertible debt
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential shares of common stock excluded from computation of earnings (loss) per share as they are anti-dilutive 17,365 17,372 0
Unvested restricted stock units
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential shares of common stock excluded from computation of earnings (loss) per share as they are anti-dilutive 1,165 1,068 134
Potentially issuable common stock for ESPP purchases
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential shares of common stock excluded from computation of earnings (loss) per share as they are anti-dilutive 263 241 0
Common stock held by the Nonqualified Deferred Compensation Plan
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential shares of common stock excluded from computation of earnings (loss) per share as they are anti-dilutive 233 173 104