Deferred Revenue and Advance Payments (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Deferred Revenue Disclosure [Abstract]
Deferred product licenses revenue, Current	$ 100	$ 481
Deferred subscription services revenue, Current	17,934	16,561
Deferred product support revenue, Current	142,543	161,670
Deferred other services revenue, Current	7,066	8,395
Total current deferred revenue and advance payments	167,643	187,107
Deferred product licenses revenue, Non-current	168	293
Deferred subscription services revenue, Non-current	90	97
Deferred product support revenue, Non-current	5,152	3,417
Deferred other services revenue, Non-current	500	537
Total non-current deferred revenue and advance payments	$ 5,910	$ 4,344