Employee Stock-Based Compensation and Benefit Plans (Detail of the Total Stock-Based Compensation Recognized by Income Statement Classification) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation	$ 278,892	$ 203,619	$ 165,120
Cost of subscription, support and services
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation	10,921	7,979	4,281
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation	104,553	66,154	47,291
Sales, marketing and services
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation	95,535	72,406	55,173
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation	$ 67,883	$ 57,080	$ 58,375