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Schedule of Amortizable Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets    
Gross Carrying Amount $ 538,326 $ 537,366
Accumulated Amortization 254,598 218,499
Net Carrying Amount 283,728 318,867
Weighted Average Useful Life, years 7 years 7 years
Developed technology
    
Finite-Lived Intangible Assets    
Gross Carrying Amount 358,515 357,555
Accumulated Amortization 168,339 143,126
Net Carrying Amount 190,176 214,429
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 72,581 63,464
Net Carrying Amount 72,390 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 12,678 10,909
Net Carrying Amount 21,162 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