Deferred Revenue and Advance Payments (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Deferred Revenue Disclosure [Abstract]
Deferred product licenses revenue, Current	$ 1,090	$ 993
Deferred subscription services revenue, Current	34,185	35,589
Deferred product support revenue, Current	166,119	166,477
Deferred other services revenue, Current	4,823	6,801
Total current deferred revenue and advance payments	206,217	209,860
Deferred product licenses revenue, Non-current	80	68
Deferred subscription services revenue, Non-current	2,153	1,064
Deferred product support revenue, Non-current	5,368	6,203
Deferred other services revenue, Non-current	635	754
Total non-current deferred revenue and advance payments	$ 8,236	$ 8,089