Deferred Revenue and Advance Payments (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Revenue Disclosure [Abstract]
Deferred product licenses revenue, Current	$ 481	$ 1,768
Deferred subscription services revenue, Current	16,561	13,508
Deferred product support revenue, Current	161,670	152,501
Deferred other services revenue, Current	8,395	8,763
Total current deferred revenue and advance payments	187,107	176,540
Deferred product licenses revenue, Non-current	293	542
Deferred subscription services revenue, Non-current	97	2,384
Deferred product support revenue, Non-current	3,417	3,091
Deferred other services revenue, Non-current	537	452
Total non-current deferred revenue and advance payments	$ 4,344	$ 6,469