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Share-Based Compensation (Schedule Of Stock Option Activity) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding as of December 31, 2011 3,353
Granted 505
Exercised   
Forfeited (28)
Cancelled (704)
Outstanding as of June 30, 2012 3,126
Exercisable as of June 30, 2012 2,330
Outstanding as of December 31, 2011 $ 27.79
Granted $ 8.18
Exercised   
Forfeited $ 17.88
Cancelled $ 23.39
Outstanding as of June 30, 2012 $ 25.70
Exercisable as of June 30, 2012 $ 29.42