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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 38,185	$ 31,862	$ 103,256	$ 84,784
Related income tax benefits	(10,060)	(9,847)	(46,849)	(30,075)
Stock-based compensation expense, net of taxes	$ 28,125	$ 22,015	$ 56,407	$ 54,709
Basic earnings per share	$ (0.33)	$ (0.26)	$ (0.66)	$ (0.65)
Diluted earnings per share	$ (0.32)	$ (0.26)	$ (0.65)	$ (0.64)
Maintenance and service
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 3,626	$ 2,422	$ 9,956	$ 6,024
Selling, General and Administrative
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	18,954	16,774	50,417	44,408
Research and Development
Employee Service Share-Based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 15,605	$ 12,666	$ 42,883	$ 34,352