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Schedule of Amortizable Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets    
Gross Carrying Amount $ 537,366 $ 537,366
Accumulated Amortization 236,535 218,499
Net Carrying Amount 300,831 318,867
Weighted Average Useful Life, years 7 years 7 years
Developed technology
    
Finite-Lived Intangible Assets    
Gross Carrying Amount 357,555 357,555
Accumulated Amortization 155,720 143,126
Net Carrying Amount 201,835 214,429
Weighted Average Useful Life, years 6 years 3 months 18 days 6 years 3 months 18 days
Customer Relationships And Service And Software Maintenance Contracts
    
Finite-Lived Intangible Assets    
Gross Carrying Amount 144,971 144,971
Accumulated Amortization 68,022 63,464
Net Carrying Amount 76,949 81,507
Weighted Average Useful Life, years 8 years 8 years
Trade Names And Trademarks
    
Finite-Lived Intangible Assets    
Gross Carrying Amount 33,840 33,840
Accumulated Amortization 11,793 10,909
Net Carrying Amount 22,047 22,931
Weighted Average Useful Life, years 9 years 9 years
Customer Backlog
    
Finite-Lived Intangible Assets    
Gross Carrying Amount 1,000 1,000
Accumulated Amortization $ 1,000 $ 1,000
Weighted Average Useful Life, years 4 months 24 days 4 months 24 days