Deferred Revenue and Advance Payments (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred Revenue Disclosure [Abstract]
Deferred product licenses revenue, Current	$ 993	$ 1,495
Deferred subscription services revenue, Current	35,589	26,258
Deferred product support revenue, Current	166,477	156,216
Deferred other services revenue, Current	6,801	7,281
Total current deferred revenue and advance payments	209,860	191,250
Deferred product licenses revenue, Non-current	68	139
Deferred subscription services revenue, Non-current	1,064	8,758
Deferred product support revenue, Non-current	6,203	5,055
Deferred other services revenue, Non-current	754	710
Total non-current deferred revenue and advance payments	$ 8,089	$ 14,662