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Patent Assets, Net (Detail) - Expected Future Annual Amortization Expense Of Patent Assets (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
2013 (remainder) $ 739  
2014 906  
2015 625  
2016 188  
Total estimated future amortization expense 221,362 199,314
Patents [Member]
   
Finite-Lived Intangible Assets [Line Items]    
2013 (remainder) 47,627  
2014 75,803  
2015 57,047  
2016 31,806  
2017 8,228  
Thereafter 851  
Total estimated future amortization expense $ 221,362 $ 199,314