Stock-Based Compensation Expense and Its Net Impact on Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 31,862	$ 22,983	$ 84,784	$ 58,887
Related income tax benefits	(9,847)	(8,611)	(30,075)	(30,311)
Stock-based compensation expense, net of taxes	$ 22,015	$ 14,372	$ 54,709	$ 28,576
Basic earnings per share	$ (0.26)	$ (0.17)	$ (0.65)	$ (0.34)
Diluted earnings per share	$ (0.26)	$ (0.17)	$ (0.64)	$ (0.33)
Maintenance and service
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 2,422	$ 1,438	$ 6,024	$ 3,880
Selling, General and Administrative
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	16,774	13,484	44,408	33,288
Research and Development
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 12,666	$ 8,061	$ 34,352	$ 21,719