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Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Number of Shares    
Outstanding January 1, 2012 11,871,000  
Granted 2,705,000  
Cancelled/Expired (304,000)  
Exercised 3,380,413 2,273,221
Outstanding, December 31, 2012 10,892,000 11,871,000
Exercisable, December 31, 2012 3,857,000  
Vested and Expected to Vest, December 31, 2012 10,632,000  
Available for future grant at December 31, 2012 7,864,000  
Weighted Average Exercise Price    
Outstanding January 1, 2012 $ 5.33  
Granted $ 10.49  
Cancelled/Expired $ 13.09  
Exercised $ 2.44  
Outstanding, December 31, 2012 $ 7.29 $ 5.33
Exercisable, December 31, 2012 $ 5.23  
Vested and Expected to Vest, December 31, 2012 $ 7.26  
Weighted Average Remaining Contractual Term    
Outstanding, December 31, 2012 8 years 3 months 18 days  
Exercisable, December 31, 2012 7 years 9 months 18 days  
Vested and Expected to Vest, December 31, 2012 8 years 2 months 12 days  
Aggregate Intrinsic Value    
Outstanding, December 31, 2012 $ 26,337  
Exercisable, December 31, 2012 15,234  
Vested and Expected to Vest, December 31, 2012 $ 25,927