Revenue from Contracts with Customers - Schedule of Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation Of Revenue [Line Items]
Total revenue	$ 159,781	$ 150,163
Term Licenses and Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	94,045	84,934
Perpetual Licenses [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	12,124	11,461
Maintenance [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	33,337	29,694
Professional Software Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	1,391	3,452
Software Related Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	9,061	8,098
Client Engineering Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	8,012	10,677
Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 1,811	$ 1,847