Revenue from Contracts with Customers - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 446,654	$ 385,661	$ 809,880	$ 690,646
Lease licenses
Disaggregation of Revenue [Line Items]
Total revenue	129,794	113,209	194,871	158,083
Perpetual licenses
Disaggregation of Revenue [Line Items]
Total revenue	85,028	56,132	152,555	99,088
Software licenses
Disaggregation of Revenue [Line Items]
Total revenue	214,822	169,341	347,426	257,171
Maintenance
Disaggregation of Revenue [Line Items]
Total revenue	218,297	203,179	431,971	403,667
Service
Disaggregation of Revenue [Line Items]
Total revenue	13,535	13,141	30,483	29,808
Maintenance and service
Disaggregation of Revenue [Line Items]
Total revenue	$ 231,832	$ 216,320	$ 462,454	$ 433,475
Direct revenue, as a percentage of total revenue | Revenue Benchmark | Sales Channel Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	75.40%	78.10%	73.80%	76.20%
Indirect revenue, as a percentage of total revenue | Revenue Benchmark | Sales Channel Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	24.60%	21.90%	26.20%	23.80%