Intangible Assets and Estimated Useful Lives (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	$ 643,152	$ 613,009
Amortized intangible assets, Accumulated Amortization	(317,126)	(251,846)
Unamortized intangible assets, Gross Carrying Amount	25,147
Developed software and core technologies
Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	298,802	287,392
Amortized intangible assets, Accumulated Amortization	(175,988)	(144,836)
Customer lists and contract backlog
Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	241,721	223,037
Amortized intangible assets, Accumulated Amortization	(100,702)	(76,630)
Trade Names [Member]
Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	102,629	102,580
Amortized intangible assets, Accumulated Amortization	(40,436)	(30,380)
Trade Names [Member]
Intangible Assets [Line Items]
Unamortized intangible assets, Gross Carrying Amount	$ 25,147	$ 22,257