Stock-Based Compensation Expense, and its net Impact on Basic and Diluted Earnings per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 9,081	$ 8,104	$ 26,742	$ 23,930
Related income tax benefits	(2,623)	(2,062)	(8,490)	(6,330)
Stock-based compensation expense, net of taxes	6,458	6,042	18,252	17,600
Basic earnings per share	$ (0.07)	$ (0.07)	$ (0.20)	$ (0.19)
Diluted earnings per share	$ (0.07)	$ (0.06)	$ (0.19)	$ (0.19)
Software Licenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	335	369	1,023	1,139
Maintenance and Service
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	590	558	1,762	1,680
Selling, General and Administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	4,392	3,873	12,755	11,275
Research and Development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 3,764	$ 3,304	$ 11,202	$ 9,836