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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

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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