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Patent Assets, Net (Detail) - Expected Future Annual Amortization Expense of Patent Assets (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]    
2012 (remainder) $ 379  
2013 1,496  
2014 906  
2015 625  
2016 188  
Total estimated future amortization expense 197,321 163,352
Patents [Member]
   
Finite-Lived Intangible Assets [Line Items]    
2012 (remainder) 20,532  
2013 72,022  
2014 47,096  
2015 33,482  
2016 20,547  
Thereafter 3,642  
Total estimated future amortization expense $ 197,321 $ 163,352