Schedule of Amortizable Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 537,366	$ 537,966
Accumulated Amortization	218,499	144,991
Net Carrying Amount	318,867	392,975
Weighted Average Useful Life, years	7 years	7 years
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	357,555	358,155
Accumulated Amortization	143,126	91,391
Net Carrying Amount	214,429	266,764
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	63,464	45,230
Net Carrying Amount	81,507	99,741
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	10,909	7,370
Net Carrying Amount	22,931	26,470
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