Revenue from Contracts with Customers - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 363,226	$ 304,985
Lease licenses
Disaggregation of Revenue [Line Items]
Total revenue	65,077	44,874
Perpetual licenses
Disaggregation of Revenue [Line Items]
Total revenue	67,527	42,956
Software licenses
Disaggregation of Revenue [Line Items]
Total revenue	132,604	87,830
Maintenance
Disaggregation of Revenue [Line Items]
Total revenue	213,674	200,488
Service
Disaggregation of Revenue [Line Items]
Total revenue	16,948	16,667
Maintenance and service
Disaggregation of Revenue [Line Items]
Total revenue	$ 230,622	$ 217,155
Direct revenue, as a percentage of total revenue
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	71.80%	73.60%
Indirect revenue, as a percentage of total revenue
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	28.20%	26.40%